Surrounding rock grading correction method and device based on tunnel buried depth and weathering layer thickness
阅读说明：本技术 基于隧道埋深及风化层厚度的围岩分级修正方法及装置 (Surrounding rock grading correction method and device based on tunnel buried depth and weathering layer thickness ) 是由 陈立保 王克金 于 2019-10-14 设计创作，主要内容包括：一种基于隧道埋深及风化层厚度的围岩分级修正方法及装置,所述方法包括：步骤1,对于隧道洞身段全部位于单一风化地层的隧道段落采用规范规定的办法进行基本围岩分级,获得初始围岩级别；步骤2,根据隧道埋深、风化层厚度对初始围岩级别进行分级修正,得到修正后的围岩级别。针对现有技术中围岩分级没有考虑隧道埋深以及风化岩层厚度的影响,本发明提出一种全新的围岩分级修正方法,根据隧道埋深及风化层厚度对初始围岩级别进行分级修正,减少了主观影响,通过围岩级别量化,隧道围岩界别修正效果显著。(A method and a device for correcting surrounding rock grading based on tunnel buried depth and weathered layer thickness are provided, wherein the method comprises the following steps: step 1, carrying out basic surrounding rock grading on tunnel sections of which tunnel body sections are all located in a single weathered stratum by adopting a standard method to obtain an initial surrounding rock grade; and 2, carrying out graded correction on the initial surrounding rock grade according to the tunnel burial depth and the weathering layer thickness to obtain the corrected surrounding rock grade. Aiming at the problem that influence of tunnel buried depth and weathered rock layer thickness is not considered in surrounding rock grading in the prior art, the invention provides a brand-new surrounding rock grading correction method.)
1. A method for correcting surrounding rock grading based on tunnel buried depth and weathered layer thickness is characterized by comprising the following steps:
step 1, carrying out basic surrounding rock grading on tunnel sections of which tunnel body sections are all located in a single weathered stratum by adopting a standard method to obtain an initial surrounding rock grade;
and 2, carrying out graded correction on the initial surrounding rock grade according to the tunnel burial depth and the weathering layer thickness to obtain the corrected surrounding rock grade.
2. The method for correcting the surrounding rock grading based on the tunnel buried depth and the weathering layer thickness according to claim 1, wherein in the step 1, basic surrounding rock grading is performed on a tunnel section where all tunnel body sections are located in a single weathering stratum by a method specified by a specification, and the obtained initial surrounding rock grade specifically comprises:
carrying out basic surrounding rock grading on a W1/W2 stratum of the tunnel body to obtain initial surrounding rock grades II, III, IV and V;
carrying out basic surrounding rock grading on a W3 stratum of the tunnel body to obtain initial surrounding rock grades III, IV and V;
carrying out basic surrounding rock grading on a W4 stratum of the tunnel body to obtain initial surrounding rock grades IV and V;
wherein, W1-W4 represent the weathering degree of the surrounding rock, W1 represents non-weathering, W2 represents slightly weathering, W3 represents strongly weathering, and W4 represents fully weathering.
3. The method for correcting the surrounding rock grading based on the tunnel burial depth and the weathering layer thickness according to claim 2, wherein the step 2 comprises the following steps:
correcting initial surrounding rock levels II, III, IV and V of the tunnel body in the W1/W2 stratum according to the tunnel burial depth and the weathering layer thickness;
correcting initial surrounding rock levels III, IV and V of the tunnel body in the W3 stratum according to the tunnel burial depth and the weathering layer thickness;
and correcting the initial surrounding rock levels IV and V of the tunnel body in the W4 stratum according to the tunnel burial depth and the weathered layer thickness.
4. The method for correcting surrounding rock grading based on the tunnel burial depth and the weathering layer thickness according to claim 3, wherein the step of correcting the initial surrounding rock grades II, III, IV and V of the tunnel body in the W1/W2 stratum according to the tunnel burial depth and the weathering layer thickness specifically comprises the following steps:
when the overlying height of the regolith layer at the same level of the tunnel is more than 1B, carrying out classification according to the initial surrounding rock levels II, III, IV and V without correction;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is more than 1B, and the burial depth is more than 3B, the stratum is not corrected, and classification is still carried out according to the initial surrounding rock grades II, III, IV and V;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is less than 1B, and the burial depth is more than 3B, correcting the initial surrounding rock levels II, III, IV and V into III, IV, V and V respectively;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is more than 1B, and the burial depth is less than 3B, correcting the initial surrounding rock levels II, III, IV and V into III, IV, V and V respectively;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is less than 1B, and the burial depth is less than 3B, correcting the initial surrounding rock levels II, III, IV and V into IV, V and V respectively;
wherein, B represents the tunnel excavation width or span, and the unit is m.
5. The method for correcting the surrounding rock grading based on the tunnel burial depth and the weathering layer thickness according to claim 3, wherein the step of correcting the initial surrounding rock grades III, IV and V of the tunnel body in the W3 stratum according to the tunnel burial depth and the weathering layer thickness is specifically as follows:
when the overlying height of the regolith layer at the same level of the tunnel is more than 1B and the burial depth is more than 3B, carrying out classification according to the initial surrounding rock levels III, IV and V without correction;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B and the burial depth is more than 3B, correcting IV, V and V of the initial surrounding rock levels III, IV and V respectively;
when the tunnel burial depth is less than 3B, correcting IV, V and V of the initial surrounding rock levels III, IV and V respectively;
wherein, B represents the tunnel excavation width or span, and the unit is m.
6. The method for correcting the surrounding rock grading based on the tunnel burial depth and the weathering layer thickness according to claim 3, wherein the step of correcting the initial surrounding rock grades IV and V of the tunnel body in the W4 stratum according to the tunnel burial depth and the weathering layer thickness is specifically as follows:
when the tunnel burial depth is larger than 2B, the tunnel is not corrected, and classification is still carried out according to the initial surrounding rock grades IV and V;
when the tunnel burial depth is less than 2B, respectively correcting V, V the initial surrounding rock levels IV and V;
wherein, B represents the tunnel excavation width or span, and the unit is m.
7. A surrounding rock grading correction device based on tunnel buried depth and regolith thickness is characterized by comprising a basic surrounding rock grading module and an initial surrounding rock correction module;
the basic surrounding rock grading module is used for grading basic surrounding rocks of a tunnel section of which the tunnel body section is completely positioned in a single weathered stratum by adopting a standard method to obtain an initial surrounding rock grade;
and the initial surrounding rock correction module is used for correcting the initial surrounding rock level in a grading manner according to the tunnel buried depth and the weathering layer thickness to obtain the corrected surrounding rock level.
8. The device for correcting surrounding rock grading based on tunnel burial depth and weathering layer thickness according to claim 7, wherein the basic surrounding rock grading module is used for grading the basic surrounding rock by adopting a method specified by a specification for a tunnel section where all tunnel body sections are located in a single weathering stratum, and the obtained initial surrounding rock grade is specifically:
carrying out basic surrounding rock grading on a W1/W2 stratum of the tunnel body to obtain initial surrounding rock grades II, III, IV and V;
carrying out basic surrounding rock grading on a W3 stratum of the tunnel body to obtain initial surrounding rock grades III, IV and V;
carrying out basic surrounding rock grading on a W4 stratum of the tunnel body to obtain initial surrounding rock grades IV and V;
wherein, W1-W4 represent the weathering degree of the surrounding rock, W1 represents non-weathering, W2 represents slightly weathering, W3 represents strongly weathering, and W4 represents fully weathering.
9. The device for correcting surrounding rock grading based on tunnel burial depth and weathering layer thickness according to claim 8, wherein the initial surrounding rock correcting module corrects the initial surrounding rock grade in grading according to the tunnel burial depth and weathering layer thickness, and the corrected surrounding rock grade is specifically:
correcting initial surrounding rock levels II, III, IV and V of the tunnel body in the W1/W2 stratum according to the tunnel burial depth and the weathering layer thickness;
correcting initial surrounding rock levels III, IV and V of the tunnel body in the W3 stratum according to the tunnel burial depth and the weathering layer thickness;
correcting the initial surrounding rock levels IV and V of the tunnel body in the W4 stratum according to the tunnel burial depth and the weathered layer thickness;
the method specifically comprises the following steps of correcting the initial surrounding rock levels II, III, IV and V of the tunnel body in the W1/W2 stratum according to the tunnel burial depth and the weathering layer thickness:
when the overlying height of the regolith layer at the same level of the tunnel is more than 1B, carrying out classification according to the initial surrounding rock levels II, III, IV and V without correction;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is more than 1B, and the burial depth is more than 3B, the stratum is not corrected, and classification is still carried out according to the initial surrounding rock grades II, III, IV and V;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is less than 1B, and the burial depth is more than 3B, correcting the initial surrounding rock levels II, III, IV and V into III, IV, V and V respectively;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is more than 1B, and the burial depth is less than 3B, correcting the initial surrounding rock levels II, III, IV and V into III, IV, V and V respectively;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is less than 1B, and the burial depth is less than 3B, correcting the initial surrounding rock levels II, III, IV and V into IV, V and V respectively;
the method specifically comprises the following steps of correcting initial surrounding rock levels III, IV and V of the tunnel body in the W3 stratum according to the tunnel buried depth and the weathering layer thickness:
when the overlying height of the regolith layer at the same level of the tunnel is more than 1B and the burial depth is more than 3B, carrying out classification according to the initial surrounding rock levels III, IV and V without correction;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B and the burial depth is more than 3B, correcting IV, V and V of the initial surrounding rock levels III, IV and V respectively;
when the tunnel burial depth is less than 3B, correcting IV, V and V of the initial surrounding rock levels III, IV and V respectively;
the method specifically comprises the following steps of correcting the initial surrounding rock levels IV and V of the tunnel body in the W4 stratum according to the tunnel buried depth and the weathering layer thickness:
when the tunnel burial depth is larger than 2B, the tunnel is not corrected, and classification is still carried out according to the initial surrounding rock grades IV and V;
when the tunnel burial depth is less than 2B, respectively correcting V, V the initial surrounding rock levels IV and V;
wherein, B represents the tunnel excavation width or span, and the unit is m.
Technical Field
The invention belongs to the technical field of tunnel engineering, and particularly relates to a surrounding rock grading correction method based on tunnel buried depth and weathered layer thickness.
Background
A large number of urban tunnels and mountain short tunnels emerge at present, and have the common characteristics that the tunnel burial depth is not large, the tunnel body passes through composite strata with different weathering degrees, but the influences of the tunnel burial depth and the thickness of a differentiation layer are not considered in the classification of surrounding rocks according to the current tunnel design specification, and geological engineers generally consider the influences of the tunnel burial depth for safety, so that the classification of the surrounding rocks of the tunnel has larger uncertainty.
The existing surrounding rock grading method has the following problems:
(1) the influence of the rock weathering degree is considered in the tunnel surrounding rock grading, a specific rock weathering degree identification method is provided, but the tunnel surrounding rock grading management method does not consider the tunnel burial depth and the thickness of the weathered rock stratum at present, and a method for grading the surrounding rock of the composite weathered rock stratum is absent.
(2) The existing surrounding rock grading method is combined with quantification and qualification, surrounding rock grading is generally provided by geological engineers, tunnel engineers provide targeted engineering measures for different surrounding rock grades, and the influences of tunnel burial depth and terrain bias degree are considered, but the influences of tunnel burial depth are also considered by the geological engineers often, so that the surrounding rock grade or the engineering measures are stronger, and engineering waste is caused.
(3) The radius of a plane curve of a high-speed railway is large, a large number of short tunnels and large-section shallow buried tunnels appear in the route selection process, weathered layer interfaces appear on tunnel bodies in different weathered rock layers or in the upper and lower close ranges of the tunnels, subjective randomness exists in surrounding rock classification due to the fact that no standard regulation exists, and due to the fact that the quantity is large, the defects or waste may exist in engineering design measures.
Except for tunnels with special hydrogeological conditions, most short tunnels generally only have one stratum, and the difference of tunnel surrounding rocks is mainly reflected in the difference of weathered strata.
As shown in figure 1, the longitudinal section of a tunnel on a mountain, the stratum where the tunnel is located is Taigu Dabie group (Ar) gneiss, the elastic longitudinal wave velocity of surrounding rocks is 4200-5650 m/s, most of the tunnel is located in a weakly weathered stratum, according to judgment of railway tunnel design specifications, basic surrounding rock grading is mainly II-level and III-level surrounding rocks, the lengths of III-level, IV-level and V-level surrounding rocks provided by geological specialties are respectively 200m, 620m and 600m, and obviously the influence of tunnel burial depth on the surrounding rock grade is considered by the geological specialties.
For most tunnels, similar to the tunnel of the previous example, the tunnel is mostly at a general stress level, except that there is a significant water source on the earth's surface or the tunnel is in a fault fracture zone or contact zone, and no groundwater correction for the grade of the surrounding rock is required. Therefore, for most tunnels, fault fracture zones are generally directly classified into IV-grade and V-grade surrounding rocks, and the surrounding rock differences of other sections are mainly reflected in the weathering degree and the weathering layer thickness.
The influence of tunnel burial depth is not considered in the current surrounding rock grading, but for geological engineers, the smaller the burial depth is, the weaker the surrounding rock arching capability is, and particularly under the condition of lifelong design quality responsibility, geological personnel also have system factors for properly preserving the surrounding rock grading. In order to avoid similar problems, it is necessary to consider the important factor of the burial depth in the surrounding rock classification, so as to reduce the subjective influence.
Disclosure of Invention
In order to solve the technical problems, the invention provides a surrounding rock grading correction method based on tunnel buried depth and weathering layer thickness, which is characterized in that basic surrounding rock grading is carried out on tunnel sections of which tunnel body sections are all positioned in a single weathering stratum by adopting a standard method, and then a surrounding rock grading correction method based on tunnel buried depth and weathering layer thickness is introduced to correct the basic surrounding rock grade, so that the effects of quantifying and standardizing tunnel surrounding rock grading are achieved, and the technical scheme of the invention is as follows:
as a first aspect of the present invention, there is provided a method for correcting surrounding rock grading based on tunnel burial depth and regolith thickness, the method including:
step 1, carrying out basic surrounding rock grading on tunnel sections of which tunnel body sections are all located in a single weathered stratum by adopting a standard method to obtain an initial surrounding rock grade;
and 2, carrying out graded correction on the initial surrounding rock grade according to the tunnel burial depth and the weathering layer thickness to obtain the corrected surrounding rock grade.
Further, in step 1, basic surrounding rock grading is performed on all tunnel sections of which tunnel body sections are located in a single weathered stratum by adopting a method specified by a standard, and the obtained initial surrounding rock grade is specifically as follows:
carrying out basic surrounding rock grading on a W1/W2 stratum of the tunnel body to obtain initial surrounding rock grades II, III, IV and V;
carrying out basic surrounding rock grading on a W3 stratum of the tunnel body to obtain initial surrounding rock grades III, IV and V;
carrying out basic surrounding rock grading on a W4 stratum of the tunnel body to obtain initial surrounding rock grades IV and V;
wherein, W1-W4 represent the weathering degree of the surrounding rock, W1 represents non-weathering, W2 represents slightly weathering, W3 represents strongly weathering, and W4 represents fully weathering.
Further, step 2 comprises:
correcting initial surrounding rock levels II, III, IV and V of the tunnel body in the W1/W2 stratum according to the tunnel burial depth and the weathering layer thickness;
correcting initial surrounding rock levels III, IV and V of the tunnel body in the W3 stratum according to the tunnel burial depth and the weathering layer thickness;
and correcting the initial surrounding rock levels IV and V of the tunnel body in the W4 stratum according to the tunnel burial depth and the weathered layer thickness.
Further, the step of correcting the initial surrounding rock levels II, III, IV and V of the tunnel body in the W1/W2 stratum according to the tunnel buried depth and the thickness of the weathering layer specifically comprises the following steps:
when the overlying height of the regolith layer at the same level of the tunnel is more than 1B, carrying out classification according to the initial surrounding rock levels II, III, IV and V without correction;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is more than 1B, and the burial depth is more than 3B, the stratum is not corrected, and classification is still carried out according to the initial surrounding rock grades II, III, IV and V;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is less than 1B, and the burial depth is more than 3B, correcting the initial surrounding rock levels II, III, IV and V into III, IV, V and V respectively;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is more than 1B, and the burial depth is less than 3B, correcting the initial surrounding rock levels II, III, IV and V into III, IV, V and V respectively;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is less than 1B, and the burial depth is less than 3B, correcting the initial surrounding rock levels II, III, IV and V into IV, V and V respectively;
wherein B represents the tunnel excavation width or span and has the unit of m
Further, the step of correcting the initial surrounding rock levels III, IV and V of the tunnel body in the W3 stratum according to the tunnel burial depth and the weathering layer thickness specifically comprises the following steps:
when the overlying height of the regolith layer at the same level of the tunnel is more than 1B and the burial depth is more than 3B, carrying out classification according to the initial surrounding rock levels III, IV and V without correction;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B and the burial depth is more than 3B, correcting IV, V and V of the initial surrounding rock levels III, IV and V respectively;
when the tunnel burial depth is less than 3B, correcting IV, V and V of the initial surrounding rock levels III, IV and V respectively;
wherein, B represents the tunnel excavation width or span, and the unit is m.
Further, the step of correcting the initial surrounding rock levels IV and V of the tunnel body in the W4 stratum according to the tunnel burial depth and the thickness of the weathered layer is specifically as follows:
when the tunnel burial depth is larger than 2B, the tunnel is not corrected, and classification is still carried out according to the initial surrounding rock grades IV and V;
when the tunnel burial depth is less than 2B, respectively correcting V, V the initial surrounding rock levels IV and V;
wherein, B represents the tunnel excavation width or span, and the unit is m.
As a second aspect of the present invention, there is provided a surrounding rock grading correction device based on tunnel buried depth and regolith thickness, the device comprising a basic surrounding rock grading module and an initial surrounding rock correction module;
the basic surrounding rock grading module is used for grading basic surrounding rocks of a tunnel section of which the tunnel body section is completely positioned in a single weathered stratum by adopting a standard method to obtain an initial surrounding rock grade;
and the initial surrounding rock correction module is used for correcting the initial surrounding rock level in a grading manner according to the tunnel buried depth and the weathering layer thickness to obtain the corrected surrounding rock level.
Further, the basic surrounding rock grading module is used for grading basic surrounding rocks of a tunnel section of which the tunnel body section is completely positioned in a single weathered stratum by adopting a method specified by a standard, and the obtained initial surrounding rock grade is specifically as follows:
carrying out basic surrounding rock grading on a W1/W2 stratum of the tunnel body to obtain initial surrounding rock grades II, III, IV and V;
carrying out basic surrounding rock grading on a W3 stratum of the tunnel body to obtain initial surrounding rock grades III, IV and V;
carrying out basic surrounding rock grading on a W4 stratum of the tunnel body to obtain initial surrounding rock grades IV and V;
wherein, W1-W4 represent the weathering degree of the surrounding rock, W1 represents non-weathering, W2 represents slightly weathering, W3 represents strongly weathering, and W4 represents fully weathering.
Further, the initial surrounding rock correcting module corrects the initial surrounding rock level in a grading manner according to the tunnel burial depth and the weathering layer thickness, and the corrected surrounding rock level is obtained by the following specific steps:
correcting initial surrounding rock levels II, III, IV and V of the tunnel body in the W1/W2 stratum according to the tunnel burial depth and the weathering layer thickness;
correcting initial surrounding rock levels III, IV and V of the tunnel body in the W3 stratum according to the tunnel burial depth and the weathering layer thickness;
correcting the initial surrounding rock levels IV and V of the tunnel body in the W4 stratum according to the tunnel burial depth and the weathered layer thickness;
the method specifically comprises the following steps of correcting the initial surrounding rock levels II, III, IV and V of the tunnel body in the W1/W2 stratum according to the tunnel burial depth and the weathering layer thickness:
when the overlying height of the regolith layer at the same level of the tunnel is more than 1B, carrying out classification according to the initial surrounding rock levels II, III, IV and V without correction;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is more than 1B, and the burial depth is more than 3B, the stratum is not corrected, and classification is still carried out according to the initial surrounding rock grades II, III, IV and V;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is less than 1B, and the burial depth is more than 3B, correcting the initial surrounding rock levels II, III, IV and V into III, IV, V and V respectively;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is more than 1B, and the burial depth is less than 3B, correcting the initial surrounding rock levels II, III, IV and V into III, IV, V and V respectively;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is less than 1B, and the burial depth is less than 3B, correcting the initial surrounding rock levels II, III, IV and V into IV, V and V respectively;
the method specifically comprises the following steps of correcting initial surrounding rock levels III, IV and V of the tunnel body in the W3 stratum according to the tunnel buried depth and the weathering layer thickness:
when the overlying height of the regolith layer at the same level of the tunnel is more than 1B and the burial depth is more than 3B, carrying out classification according to the initial surrounding rock levels III, IV and V without correction;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B and the burial depth is more than 3B, correcting IV, V and V of the initial surrounding rock levels III, IV and V respectively;
when the tunnel burial depth is less than 3B, correcting IV, V and V of the initial surrounding rock levels III, IV and V respectively;
the method specifically comprises the following steps of correcting the initial surrounding rock levels IV and V of the tunnel body in the W4 stratum according to the tunnel buried depth and the weathering layer thickness:
when the tunnel burial depth is larger than 2B, the tunnel is not corrected, and classification is still carried out according to the initial surrounding rock grades IV and V;
when the tunnel burial depth is less than 2B, respectively correcting V, V the initial surrounding rock levels IV and V;
wherein, B represents the tunnel excavation width or span, and the unit is m.
The invention has the following beneficial effects:
aiming at the problem that influence of tunnel buried depth and weathered rock layer thickness is not considered in surrounding rock grading in the prior art, the invention provides a brand-new surrounding rock grading correction method.
Drawings
Fig. 1 is a flowchart of a method for correcting surrounding rock grading based on tunnel buried depth and weathered layer thickness according to an embodiment of the present invention
FIG. 2 is a diagram illustrating an example of a mountain tunnel surrounding rock classification according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a surrounding rock level corrected by the method according to the present invention for the mountain tunnel according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, as a first embodiment of the present invention, there is provided a method for correcting a surrounding rock grading based on a tunnel buried depth and a weathered layer thickness, the method including:
step 1, carrying out basic surrounding rock grading on tunnel sections of which tunnel body sections are all located in a single weathered stratum by adopting a standard method to obtain an initial surrounding rock grade;
and 2, carrying out graded correction on the initial surrounding rock grade according to the tunnel burial depth and the weathering layer thickness to obtain the corrected surrounding rock grade.
Preferably, in step 1, basic surrounding rock grading is performed on a tunnel section where all tunnel sections are located in a single weathered stratum by using a method specified by a specification, and the obtained initial surrounding rock grade specifically comprises:
carrying out basic surrounding rock grading on a W1/W2 stratum of the tunnel body to obtain initial surrounding rock grades II, III, IV and V;
carrying out basic surrounding rock grading on a W3 stratum of the tunnel body to obtain initial surrounding rock grades III, IV and V;
carrying out basic surrounding rock grading on a W4 stratum of the tunnel body to obtain initial surrounding rock grades IV and V;
wherein, W1-W4 represent the weathering degree of the surrounding rock, W1 represents non-weathering, W2 represents slightly weathering, W3 represents strongly weathering, and W4 represents fully weathering.
Preferably, step 2 comprises:
correcting initial surrounding rock levels II, III, IV and V of the tunnel body in the W1/W2 stratum according to the tunnel burial depth and the weathering layer thickness;
correcting initial surrounding rock levels III, IV and V of the tunnel body in the W3 stratum according to the tunnel burial depth and the weathering layer thickness;
and correcting the initial surrounding rock levels IV and V of the tunnel body in the W4 stratum according to the tunnel burial depth and the weathered layer thickness.
The concrete correction of the initial surrounding rock levels II, III, IV and V of the tunnel body in the W1/W2 stratum according to the tunnel burial depth and the weathering layer thickness is shown in the table 1:
when the overlying height of the regolith layer at the same level of the tunnel is more than 1B, carrying out classification according to the initial surrounding rock levels II, III, IV and V without correction;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is more than 1B, and the burial depth is more than 3B, the stratum is not corrected, and classification is still carried out according to the initial surrounding rock grades II, III, IV and V;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is less than 1B, and the burial depth is more than 3B, correcting the initial surrounding rock levels II, III, IV and V into III, IV, V and V respectively;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is more than 1B, and the burial depth is less than 3B, correcting the initial surrounding rock levels II, III, IV and V into III, IV, V and V respectively;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is less than 1B, and the burial depth is less than 3B, correcting the initial surrounding rock levels II, III, IV and V into IV, V and V respectively;
wherein, B represents the tunnel excavation width or span, and the unit is m;
TABLE 1
The concrete correction of the initial surrounding rock levels III, IV and V of the tunnel body in the W3 stratum according to the tunnel buried depth and the weathering layer thickness is shown in the table 2:
when the overlying height of the regolith layer at the same level of the tunnel is more than 1B and the burial depth is more than 3B, carrying out classification according to the initial surrounding rock levels III, IV and V without correction;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B and the burial depth is more than 3B, correcting IV, V and V of the initial surrounding rock levels III, IV and V respectively;
when the tunnel burial depth is less than 3B, correcting IV, V and V of the initial surrounding rock levels III, IV and V respectively;
wherein, B represents the tunnel excavation width or span, and the unit is m.
Initial surrounding rock grade
Ⅲ
Ⅳ
Ⅴ
The overlying height of the same regolith is more than 1B and the buried depth is more than 3B
Ⅲ
Ⅳ
Ⅴ
The overlying height of the same regolith is less than 1B and the buried depth is more than 3B
Ⅳ
Ⅴ
Ⅴ
Buried depth less than 3B
Ⅳ
Ⅴ
Ⅴ
TABLE 2
The concrete correction of the initial surrounding rock levels IV and V of the tunnel body in the W4 stratum according to the tunnel buried depth and the weathered layer thickness is shown in table 3:
when the tunnel burial depth is larger than 2B, the tunnel is not corrected, and classification is still carried out according to the initial surrounding rock grades IV and V;
when the tunnel burial depth is less than 2B, respectively correcting V, V the initial surrounding rock levels IV and V;
wherein, B represents the tunnel excavation width or span, and the unit is m.
Initial surrounding rock grade
Ⅳ
Ⅴ
Buried depth greater than 2B
Ⅳ
Ⅴ
Buried depth less than 2B
Ⅴ
Ⅴ
TABLE 3
Taking the tunnel as an example, the W2 stratum may be classified into class iii, the W3 stratum may be classified into class iv, and the W4 stratum may be classified into class v, and the tunnel surrounding rock grade shown in fig. 2 is revised again according to the above method to obtain the tunnel surrounding rock grade shown in fig. 3.
The statistical pair of the surrounding rock levels before and after correction is shown in table 4:
grade of surrounding rock
Before correction
After correction
Increase and decrease of the
Ⅲ
200
720
36.6％
Ⅳ
620
391
-16.1％
Ⅴ
600
309
-20.5％
Total up to
1420
1420
TABLE 4
It can be seen that through the grade correction of the surrounding rocks, the grade III surrounding rocks are improved by 36.6%, the grade IV and grade V surrounding rocks are correspondingly reduced, and through the grade quantization of the surrounding rocks, the effect of correcting the grade of the tunnel surrounding rocks is remarkable.
As a second embodiment of the present invention, there is provided a surrounding rock grading correction device based on tunnel buried depth and regolith thickness, the device including a basic surrounding rock grading module and an initial surrounding rock correction module;
the basic surrounding rock grading module is used for grading basic surrounding rocks of a tunnel section of which the tunnel body section is completely positioned in a single weathered stratum by adopting a standard method to obtain an initial surrounding rock grade;
and the initial surrounding rock correction module is used for correcting the initial surrounding rock level in a grading manner according to the tunnel buried depth and the weathering layer thickness to obtain the corrected surrounding rock level.
Further, the basic surrounding rock grading module is used for grading basic surrounding rocks of a tunnel section of which the tunnel body section is completely positioned in a single weathered stratum by adopting a method specified by a standard, and the obtained initial surrounding rock grade is specifically as follows:
carrying out basic surrounding rock grading on a W1/W2 stratum of the tunnel body to obtain initial surrounding rock grades II, III, IV and V;
carrying out basic surrounding rock grading on a W3 stratum of the tunnel body to obtain initial surrounding rock grades III, IV and V;
carrying out basic surrounding rock grading on a W4 stratum of the tunnel body to obtain initial surrounding rock grades IV and V;
wherein, W1-W4 represent the weathering degree of the surrounding rock, W1 represents non-weathering, W2 represents slightly weathering, W3 represents strongly weathering, and W4 represents fully weathering.
Further, the initial surrounding rock correcting module corrects the initial surrounding rock level in a grading manner according to the tunnel burial depth and the weathering layer thickness, and the corrected surrounding rock level is obtained by the following specific steps:
correcting initial surrounding rock levels II, III, IV and V of the tunnel body in the W1/W2 stratum according to the tunnel burial depth and the weathering layer thickness;
correcting initial surrounding rock levels III, IV and V of the tunnel body in the W3 stratum according to the tunnel burial depth and the weathering layer thickness;
correcting the initial surrounding rock levels IV and V of the tunnel body in the W4 stratum according to the tunnel burial depth and the weathered layer thickness;
the method specifically comprises the following steps of correcting the initial surrounding rock levels II, III, IV and V of the tunnel body in the W1/W2 stratum according to the tunnel burial depth and the weathering layer thickness:
when the overlying height of the regolith layer at the same level of the tunnel is more than 1B, carrying out classification according to the initial surrounding rock levels II, III, IV and V without correction;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is more than 1B, and the burial depth is more than 3B, the stratum is not corrected, and classification is still carried out according to the initial surrounding rock grades II, III, IV and V;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is less than 1B, and the burial depth is more than 3B, correcting the initial surrounding rock levels II, III, IV and V into III, IV, V and V respectively;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is more than 1B, and the burial depth is less than 3B, correcting the initial surrounding rock levels II, III, IV and V into III, IV, V and V respectively;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B, W3, the stratum is less than 1B, and the burial depth is less than 3B, correcting the initial surrounding rock levels II, III, IV and V into IV, V and V respectively;
the method specifically comprises the following steps of correcting initial surrounding rock levels III, IV and V of the tunnel body in the W3 stratum according to the tunnel buried depth and the weathering layer thickness:
when the overlying height of the regolith layer at the same level of the tunnel is more than 1B and the burial depth is more than 3B, carrying out classification according to the initial surrounding rock levels III, IV and V without correction;
when the overlying height of the weathering layer at the same level of the tunnel is less than 1B and the burial depth is more than 3B, correcting IV, V and V of the initial surrounding rock levels III, IV and V respectively;
when the tunnel burial depth is less than 3B, correcting IV, V and V of the initial surrounding rock levels III, IV and V respectively;
the method specifically comprises the following steps of correcting the initial surrounding rock levels IV and V of the tunnel body in the W4 stratum according to the tunnel buried depth and the weathering layer thickness:
when the tunnel burial depth is larger than 2B, the tunnel is not corrected, and classification is still carried out according to the initial surrounding rock grades IV and V;
when the tunnel burial depth is less than 2B, respectively correcting V, V the initial surrounding rock levels IV and V;
wherein, B represents the tunnel excavation width or span, and the unit is m.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
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