阅读说明：本技术 一种隧道拱顶衬砌脱空定量分析方法 (Tunnel vault lining void quantitative analysis method ) 是由 黄潘 何明峰 史兴华 秦秀才 段文旭 蒋闯 李炳秀 王乾龙 任春山 张刚 王闯 于 2020-04-27 设计创作，主要内容包括：本发明公开了一种隧道拱顶衬砌脱空定量分析方法,在隧道中心线上布置纵向地质雷达测线从而确定隧道拱顶衬砌脱空区纵向截面的二维数据,利用衬砌脱空定量分析公式<Image he="36" wi="700" file="DDA0002468635960000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>计算出脱空区的体积大小；其中,V为脱空区体积,R为拱顶曲率半径,a、b分别为脱空区首端和末端位置的拱顶中点到脱空区底面的垂线段长度,L为脱空区纵向长度。采用上述技术方案,本发明的隧道拱顶衬砌脱空定量分析方法,能够确定隧道拱顶衬砌脱空的定量信息,包括质量缺陷的空间形态、位置分布、体积大小等三维模型空间属性。(The invention discloses a quantitative analysis method for tunnel vault lining void, which is characterized in that a longitudinal geological radar survey line is arranged on a tunnel center line so as to determine two-dimensional data of a longitudinal section of a tunnel vault lining void area, and a lining void quantitative analysis formula is utilized And calculating the size of the void area, wherein V is the volume of the void area, R is the curvature radius of the vault, a and b are respectively the lengths of vertical line segments from the midpoint of the vault at the head end and the tail end of the void area to the bottom surface of the void area, and L is the longitudinal length of the void areaAnd the volume and the like of the three-dimensional model.)

1. A tunnel vault lining void quantitative analysis method is characterized by comprising the following steps: arranging a longitudinal geological radar survey line on a tunnel center line so as to determine two-dimensional data of a longitudinal section of a tunnel vault lining goaf, and calculating the size of the goaf by using a lining goaf quantitative analysis formula to realize quantitative analysis of tunnel vault lining goaf;

the lining void quantitative analysis formula is as follows:

wherein V is the volume of the gob, R is the curvature radius of the vault, a and b are respectively the lengths of vertical line segments from the middle point of the vault at the head end and the tail end of the gob to the bottom surface of the gob, and L is the longitudinal length of the gob.

2. The tunnel vault lining void quantitative analysis method of claim 1, further comprising the steps of: and determining the position form of the void area by establishing a three-dimensional space model.

3. The quantitative analysis method for tunnel vault lining void according to claim 2, characterized in that: the building of the three-dimensional space model comprises building a tunnel engineering three-dimensional model through tunnel engineering data and building a three-dimensional model of a void area through two-dimensional data of the tunnel vault lining void area.

4. The quantitative analysis method for tunnel vault lining void according to claim 1, characterized in that: and segmenting the longitudinal length of the void area, calculating the volume of each segment of the void area, and summing to obtain the total volume of the void area.

5. The quantitative analysis method for tunnel vault lining void according to any of claims 1 to 4, characterized in that: the two-dimensional data for determining the longitudinal section of the tunnel vault lining gob comprises the following steps:

(1) collecting tunnel engineering geological data, a construction drawing, design change data and a construction record; preparing the design lining thickness, the design section and the space of the grating and the arch frame and the surrounding rock type data of the detected tunnel according to the arrangement position of the measuring line for setting the field data acquisition parameters and processing the later data;

(2) carrying out field survey and making a measurement mileage mark;

(3) before detection, carrying out field calibration on the dielectric constant or the electromagnetic wave speed of the lining concrete, wherein each tunnel is not less than 1, each tunnel is actually measured for not less than 3 times, and the average value is the dielectric constant or the electromagnetic wave speed of the tunnel; when the length of the tunnel is more than 3km and the change of lining materials or water content is large, the number of calibration points is increased;

(4) determining the position of a measuring line, and building a detection trolley;

(5) detecting by a geological radar, wherein the moving speed of the antenna is detected to be 3-5 km/h and the antenna moves forwards at a constant speed;

(6) the original data should be played back and checked before being processed, the data record should be complete, the signal is clear, and the mileage mark is accurate;

(7) the image interpretation of the two-dimensional data is carried out according to the principle of known to unknown and qualitative guidance quantification on the basis of mastering physical parameters and lining structures in a measuring area; analyzing the relation between the position of the interfering body possibly existing and the abnormality in the radar record according to the field record, and accurately distinguishing the effective abnormality from the interfering abnormality; and (4) accurately reading data of the two-way travel time, and determining lining void calculation parameters.

Technical Field

The invention relates to a quantitative analysis method for tunnel vault lining void, and belongs to the technical field of engineering structure defect detection.

Background

With the rapid development of the western railway construction in China, the tunnel engineering accounts for higher and higher proportion in the railway construction engineering, the proportion of partial railway tunnels is up to more than 70%, and the tunnel detection market prospect is very wide. Meanwhile, the high-speed railway also puts higher requirements on the design and construction quality of the tunnel, and the guarantee of the quality of the lining entity of the railway tunnel engineering is very important for railway operation.

Influenced by the construction process, the quality defect of the existing tunnel lining mostly takes vault lining hollowing as a main form. And arranging longitudinal measuring lines on the surface of the tunnel vault lining at home and abroad to detect the lining quality defect, wherein the detected result is a longitudinal section of the lining, namely a two-dimensional image of the quality defect. Quantitative analysis research on spatial attributes of the three-dimensional model such as spatial morphology, position distribution, volume size and the like of the quality defect is less. The above attributes of the tunnel vault lining cannot be quantitatively determined, and the construction treatment of the subsequent lining quality defects is adversely affected.

Disclosure of Invention

The invention discloses a quantitative analysis method for tunnel vault lining void, which aims to solve the problem of quantitative analysis of tunnel vault lining void.

In order to achieve the aim, the tunnel vault lining void quantitative analysis method comprises the steps of arranging a longitudinal geological radar survey line on a tunnel center line so as to determine two-dimensional data of a longitudinal section of a tunnel vault lining void, and calculating the size of the void by using a lining void quantitative analysis formula to realize quantitative analysis of tunnel vault lining void;

the lining void quantitative analysis formula is as follows:

wherein V is the volume of the gob, R is the curvature radius of the vault, a and b are respectively the lengths of vertical line segments from the middle point of the vault at the head end and the tail end of the gob to the bottom surface of the gob, and L is the longitudinal length of the gob.

The tunnel vault lining void quantitative analysis method further comprises the following steps: and determining the position form of the void area by establishing a three-dimensional space model.

The building of the three-dimensional space model comprises building a tunnel engineering three-dimensional model through tunnel engineering data and building a three-dimensional model of a void area through two-dimensional data of the tunnel vault lining void area.

And segmenting the longitudinal length of the void area, calculating the volume of each segment of the void area, and summing to obtain the total volume of the void area.

The two-dimensional data for determining the longitudinal section of the tunnel vault lining gob comprises the following steps:

(1) collecting tunnel engineering geological data, a construction drawing, design change data and a construction record; preparing the design lining thickness, the design section and the space of the grating and the arch frame and the surrounding rock type data of the detected tunnel according to the arrangement position of the measuring line for setting the field data acquisition parameters and processing the later data;

(2) carrying out field survey and making a measurement mileage mark;

(3) before detection, carrying out field calibration on the dielectric constant or the electromagnetic wave speed of the lining concrete, wherein each tunnel is not less than 1, each tunnel is actually measured for not less than 3 times, and the average value is the dielectric constant or the electromagnetic wave speed of the tunnel; when the length of the tunnel is more than 3km and the change of lining materials or water content is large, the number of calibration points is increased;

(4) determining the position of a measuring line, and building a detection trolley;

(5) detecting by a geological radar, wherein the moving speed of the antenna is detected to be 3-5 km/h and the antenna moves forwards at a constant speed;

(6) the original data should be played back and checked before being processed, the data record should be complete, the signal is clear, and the mileage mark is accurate;

(7) the image interpretation of the two-dimensional data is carried out according to the principle of known to unknown and qualitative guidance quantification on the basis of mastering physical parameters and lining structures in a measuring area; analyzing the relation between the position of the interfering body possibly existing and the abnormality in the radar record according to the field record, and accurately distinguishing the effective abnormality from the interfering abnormality; and (4) accurately reading data of the two-way travel time, and determining lining void calculation parameters.

By adopting the technical scheme, compared with the prior art, the quantitative analysis method for the tunnel vault lining void removal has the following beneficial effects:

1. quantitative information of tunnel vault lining void can be determined, including three-dimensional model space attributes such as space form, position distribution, volume size and the like of quality defects;

2. the quantitative information can be used for guiding subsequent defect processing and ensuring the quality of the tunnel entity engineering.

Drawings

FIG. 1 is a three-dimensional model of a void area according to an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures and the detailed description.

The invention discloses a quantitative analysis method for tunnel vault lining void, which comprises the following steps:

s1, collecting tunnel engineering geological data, construction drawings, design change data and construction records; and preparing the data of the design lining thickness of the detected tunnel, the design sections and intervals of the grating and the arch frame, the type of the surrounding rock and the like according to the arrangement position of the measuring line for setting the field data acquisition parameters and processing the later data.

And S2, making a detection plan and selecting technical parameters.

And S3, carrying out field survey and making a measuring mileage mark.

And S4, before detection, the dielectric constant or the electromagnetic wave speed of the lining concrete should be calibrated on site, each tunnel should be not less than 1 position, each position is actually measured for not less than 3 times, and the average value is taken as the dielectric constant or the electromagnetic wave speed of the tunnel. When the length of the tunnel is more than 3km and the change of lining materials or water content is large, the number of calibration points is increased properly.

And S5, determining the position of the longitudinal geological radar survey line, and building a detection trolley, wherein the longitudinal geological radar survey line is preferably arranged on the center line of the tunnel.

And S6, detecting that the antenna should move stably and uniformly, considering the scanning speed and the actual measurement condition of the instrument, and preferably, the moving speed of the antenna is 3-5 km/h and the antenna moves forwards at a constant speed.

And S7, the original data should be played back and checked before being processed, the data record should be complete, the signal is clear, and the mileage mark is accurate. The raw data that fails must not be processed and interpreted.

S8, image interpretation is carried out according to the principle of known to unknown and qualitative guidance quantification on the basis of mastering physical parameters and lining structures in a measuring area; analyzing the relation between the position of the interfering body possibly existing and the abnormality in the radar record according to the field record, and accurately distinguishing the effective abnormality from the interfering abnormality; and (4) accurately reading data of the two-way travel time, and determining lining void calculation parameters.

And S9, establishing a three-dimensional space model to determine the position and the form of the lining goaf. The building of the three-dimensional space model comprises building a tunnel engineering three-dimensional model through tunnel engineering data and building a three-dimensional model of a void area through two-dimensional data of the tunnel vault lining void area.

And S10, calculating the size of the void area by using a lining void quantitative analysis formula, and realizing quantitative analysis of the tunnel vault lining void quality defect.

The lining void quantitative analysis formula is as follows:

wherein V is the volume of the gob, R is the curvature radius of the vault, a and b are respectively the lengths of vertical line segments from the middle point of the vault at the head end and the tail end of the gob to the bottom surface of the gob, and L is the longitudinal length of the gob.

And when the goaf is not in a more regular shape, segmenting the longitudinal length of the goaf, calculating the volume of each segment of the goaf, and summing to obtain the total volume of the goaf. As shown in fig. 1, in one embodiment, a tunnel vault lining 1 forms a dead zone, which is divided into a first zone 100 and a second zone 200, and the ground inclination angles of the first zone 100 and the second zone 200 are different, so that they can be calculated separately, wherein the lengths of vertical line segments from the vault focus at the two ends of the first zone 100 to the bottom of the dead zone are a₁、b₁The length of the first zone is L₁(ii) a The lengths of the vertical line segments from the arch center at the two ends of the second zone 200 to the bottom surface of the goaf are respectively a₂、b₂The second zone has a length of L₂。

And S11, if necessary, performing a breaking test on the lining void position, and performing a retest on the lining void quantitative information.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.