Method for controlling floor heave of open roadway based on pressure relief of chain arm saw cutting groove
阅读说明：本技术 一种基于链臂锯切槽卸压的临空巷道底鼓控制方法 (Method for controlling floor heave of open roadway based on pressure relief of chain arm saw cutting groove ) 是由 邰阳 于斌 匡铁军 杜峰 夏彬伟 姚强岭 徐武和 于 2020-06-16 设计创作，主要内容包括：本发明涉及采煤技术领域,具体涉及一种基于链臂锯切槽卸压的临空巷道底鼓控制方法,包括以下步骤：a、将两台链臂锯连续切割机分别放置在巷道端头的巷道内侧和巷道外侧；b、利用履带行走装置,调整切割刀具位置；c、启动两台链臂锯连续切割机的切割刀具,调整切割刀具链条速度；d、将切割刀具向巷道中心线推进50-150mm后,重复步骤c,完成下一次切割；e、利用履带行走装置,将两台链臂锯连续切割机向巷道另一端移动2.5-10.5m；f、重复步骤a-e进行下一轮切割,直到完成整个巷道底板切割。本发明通过链臂锯连续切割机采用定点划圆的方式,切割巷道底板,开槽效率高,围岩扰动小,开槽深度大,卸压效果好。(The invention relates to the technical field of coal mining, in particular to a method for controlling floor heave of an open roadway based on chain arm saw cutting groove pressure relief, which comprises the following steps: a. placing two chain arm saw continuous cutting machines on the inner side and the outer side of a roadway at the end of the roadway respectively; b. adjusting the position of a cutting tool by utilizing a crawler traveling device; c. starting cutting tools of the two chain arm saw continuous cutting machines, and adjusting the speed of chains of the cutting tools; d. c, after the cutting tool is pushed 50-150mm towards the center line of the roadway, repeating the step c to finish the next cutting; e. moving the two chain arm saw continuous cutting machines to the other end of the roadway for 2.5-10.5m by using a crawler traveling device; f. and repeating the steps a-e to carry out the next round of cutting until the whole roadway bottom plate is cut. According to the invention, the chain arm saw continuous cutting machine adopts a fixed point rounding mode to cut the roadway bottom plate, so that the slotting efficiency is high, the surrounding rock disturbance is small, the slotting depth is large, and the pressure relief effect is good.)
1. A method for controlling floor heave of an open roadway based on pressure relief of a chain arm sawing groove is characterized by comprising the following steps:
a. placing two chain arm saw continuous cutting machines on the inner side and the outer side of a roadway at the end of the roadway respectively, wherein the chain arm saw continuous cutting machine on the inner side of the roadway and the chain arm saw continuous cutting machine on the outer side of the roadway are arranged at a distance S along the central line of the roadway12.5-42 m;
b. simultaneously starting two chain arm saw continuous cutting machines, adjusting the positions of cutting tools by utilizing the crawler traveling device, enabling the cutting tools of the chain arm saw continuous cutting machines on the inner side of the roadway to be parallel to the inner side of the roadway, enabling the cutting tools of the chain arm saw continuous cutting machines on the outer side of the roadway to be parallel to the outer side of the roadway, and keeping the distance A between the cutting tools of the chain arm saw continuous cutting machines on the inner side and the inner side of the roadway1Is more than or equal to 50mm, and the distance A between the cutting tool of the chain arm saw continuous cutting machine at the outer side and the outer side of the roadway2Is greater than or equal to 100 mm;
c. starting the cutting tools of the two chain arm saw continuous cutting machines, adjusting the chain speed of the cutting tools to v1Then, a cutting tool with a width D of 50-150mm is set at a uniform speed v2Rotating horizontally from one side to the other side at 0.5-3.0 deg/min, and then rapidly rotating to the initial horizontal position of the cutting tool;
d. moving the cutting tools of the two chain arm saw continuous cutting machines, and pushing the cutting tools of the two chain arm saw continuous cutting machines to the center line of the roadway by a distance S2After the thickness is 50-150mm, repeating the step c, and finishing the next cutting until the cumulative width of the cutting groove is more than or equal to H;
the accumulated width H of the cutting groove is related to the horizontal stress of the roadway, the uniaxial compressive strength of the bottom plate, the width of the roadway and the depth of the cutting groove, and the calculation mode is as follows:in the formula, L is the width of a roadway and the unit is m; d is the depth of the bottom plate grooving, and the unit is m;σxthe unit is the horizontal stress of the roadway, and is MPa; compressive strength sigma of single shaft of bottom platetIn GPa.
e. The two chain arm saws are moved to the other end of the roadway by a certain distance S by utilizing the crawler traveling device32.5-10.5 m;
f. and repeating the steps a-e to carry out the next round of cutting until the whole roadway bottom plate is cut.
2. The method for controlling floor heave of an adjacent roadway based on pressure relief of a chain arm sawing slot according to claim 1, characterized by comprising the following steps: distance S between two chain arm saw continuous cutting machines along the direction of the center line of the roadway1Influenced by the tunnel burial depth, the tunnel bottom plate Purchase coefficient and the tunnel bottom plate grooving depth, and has the following relations: s1＝K1K2d, wherein d is the depth of the cutting groove of the roadway floor, K1Related to the depth of the tunnel, K2Related to the Purchase coefficient of the roadway floor, when 0<When the buried depth of the tunnel is less than or equal to 200m, K11 is ═ 1; when 200<When the buried depth of the tunnel is less than or equal to 400m, K12.5; when the tunnel is buried deep>At 400m, K13.0; when 0 is present<When the Purchase coefficient of the roadway floor is less than or equal to 3, K22.0; when 3 is<When the Purchase coefficient of the roadway floor is less than or equal to 7, K21.5; coefficient of prest when roadway floor>At 7 time, K2＝1.0。
3. The method for controlling floor heave of an adjacent roadway based on pressure relief of a chain arm sawing slot according to claim 1, characterized by comprising the following steps: distance A between cutting tool of inner side chain arm saw continuous cutting machine and inner side of roadway1Distance A between cutting tool of outer chain arm saw continuous cutting machine and outer side of roadway2All are influenced by the uniaxial compressive strength of the coal seam, and the compressive strength is 0<When the uniaxial compressive strength of the coal seam is less than or equal to 5GPa, A1>100mm，A2>200 mm; when the pressure is 5GPa<When the uniaxial compressive strength of the coal seam is less than or equal to 15GPa, A1＝80-100mm，A2150-; uniaxial compressive strength of coal seam>At 15GPa, A1＝50-80mm，A2＝100-150mm。
4. The method for controlling floor heave of an adjacent roadway based on pressure relief of a chain arm sawing slot according to claim 1, characterized by comprising the following steps: cutting tool chain velocity v1And the width D of the cutting tool is related to the Purchase system of the roadway floor, when 0<V when the Purchase coefficient of the roadway floor is less than or equal to 413m/s, and D150 mm; when 4 is present<V when the Purchase coefficient of the roadway floor is less than or equal to 812m/s, and 80 mm; coefficient of prest when roadway floor>At 8 times, v1＝1.5m/s，D＝50mm。
5. The method for controlling floor heave of an adjacent roadway based on pressure relief of a chain arm sawing slot according to claim 1, characterized by comprising the following steps: cutting tools of two chain arm saw continuous cutting machines advance distance S to roadway center line2Related to the horizontal stress of the roadway, when 0<When the horizontal stress is less than or equal to 5MPa, S250-85 mm; when the pressure is 5MPa<When the horizontal stress is less than or equal to 15MPa, S285-120 mm; horizontal stress>15MPa, S2＝120-150mm。
6. The method for controlling floor heave of an adjacent roadway based on pressure relief of a chain arm sawing slot according to claim 1, characterized by comprising the following steps: the depth d of the cutting groove is related to the Pythian coefficient of the bottom plate, and when the Pythian coefficient of the roadway bottom plate is 0< and is not more than 3, d is 6-7 m; when the Purchase coefficient of the 3< roadway floor is less than or equal to 6, d is 4-6 m; when the Purchase coefficient of the roadway floor is greater than 6, d is 2.5-4 m.
7. The method for controlling floor heave of an adjacent roadway based on pressure relief of a chain arm sawing slot according to claim 1, characterized by comprising the following steps: two chain arm saw continuous cutting machines move to the other end of the roadway by a distance S3In relation to the depth d of the cut when 0<When the depth of the cutting groove is less than or equal to 3m, S31.0d-1.2 d; when it is 3m<When the depth of the cutting groove is less than or equal to 5m, S31.2-1.5 d; when the depth of the cutting groove is>At 5m, S3＝1.5d。
8. The method for controlling floor heave of an adjacent roadway based on pressure relief of a chain arm sawing slot according to claim 1,the method is characterized in that: uniform speed v of cutting tool2Related to the Purchase coefficient of the roadway floor, when 0<When the Purchase coefficient of the roadway bottom plate is less than or equal to 3, the rotating speed v of the cutting tool22.5 to 3.0 degrees/min; when 3 is<When the Purchase coefficient of the roadway floor is less than or equal to 6, the rotating speed v of the cutting tool21.5-2.5 degree/min; coefficient of prest when roadway floor>6 hours, cutting tool rotation speed v2Is 0.5-1.5 degree/min.
Technical Field
The invention relates to the technical field of coal mining, in particular to a method for controlling floor heave of an open roadway based on chain arm saw cutting groove pressure relief.
Background
The roadway is an important passage for coal transportation and auxiliary transportation, and is a foundation for guaranteeing normal production of a coal mine. However, after the roadway is excavated, the roadway floor often swells, and the phenomenon is called roadway floor heave. The problem of the floor heave of the open roadway is the most common, the floor heave of the roadway not only can influence the running of an underground electric locomotive and a trackless rubber-tyred vehicle, but also can reduce the ventilation section of the roadway and bring serious hidden danger to the safety production of the mine. In order to effectively solve the problem of floor heave of an empty roadway, scholars at home and abroad propose various treatment methods, which comprise the following steps: anchor bolt and anchor cable support of a bottom plate, grouting of the bottom plate, pressure relief of a bottom plate slot and the like, wherein the pressure relief method of the bottom plate slot is the most common method. At present, the main means of slotting is firstly to loosen the bottom plate by energy-gathered blasting and then to excavate. The surrounding rock is disturbed greatly by adopting an energy-gathering blasting means, the excavation depth is shallow, the labor intensity is high, and in addition, the blasting means is forbidden to be adopted in some high gas mines or special areas, so that the grooving pressure relief method for the open roadway with high grooving efficiency, small surrounding rock disturbance and large grooving depth is urgently needed at present.
Disclosure of Invention
Aiming at solving the technical problems, the invention provides a method for controlling the floor heave of an open roadway based on chain arm saw cutting groove pressure relief, which solves the problems of large disturbance to surrounding rocks, shallow excavation depth and high labor intensity in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for controlling floor heave of an open roadway based on pressure relief of a chain arm sawing groove comprises the following steps:
a. placing two chain arm saw continuous cutting machines on the inner side and the outer side of a roadway at the end of the roadway respectively, wherein the chain arm saw continuous cutting machine on the inner side of the roadway and the chain arm saw continuous cutting machine on the outer side of the roadway are arranged at a distance S along the central line of the roadway12.5-42 m;
b、simultaneously starting two chain arm saw continuous cutting machines, adjusting the positions of cutting tools by utilizing the crawler traveling device, enabling the cutting tools of the chain arm saw continuous cutting machines on the inner side of the roadway to be parallel to the inner side of the roadway, enabling the cutting tools of the chain arm saw continuous cutting machines on the outer side of the roadway to be parallel to the outer side of the roadway, and keeping the distance A between the cutting tools of the chain arm saw continuous cutting machines on the inner side and the inner side of the roadway1Is more than or equal to 50mm, and the distance A between the cutting tool of the chain arm saw continuous cutting machine at the outer side and the outer side of the roadway2Is greater than or equal to 100 mm;
c. starting the cutting tools of the two chain arm saw continuous cutting machines, adjusting the chain speed of the cutting tools to v1Then, a cutting tool with a width D of 50-150mm is set at a uniform speed v2Rotating horizontally from one side to the other side at 0.5-3.0 deg/min, and then rapidly rotating to the initial horizontal position of the cutting tool;
d. moving the cutting tools of the two chain arm saw continuous cutting machines, and pushing the cutting tools of the two chain arm saw continuous cutting machines to the center line of the roadway by a distance S2After the thickness is 50-150mm, repeating the step c, and finishing the next cutting until the cumulative width of the cutting groove is more than or equal to H;
the accumulated width H of the cutting groove is related to the horizontal stress of the roadway, the uniaxial compressive strength of the bottom plate, the width of the roadway and the depth of the cutting groove, and the calculation mode is as follows:
e. The two chain arm saws are moved to the other end of the roadway by a certain distance S by utilizing the crawler traveling device32.5-10.5 m;
f. and repeating the steps a-e to carry out the next round of cutting until the whole roadway bottom plate is cut.
Preferably, the distance S between the two chain arm saw continuous cutting machines along the direction of the center line of the roadway1Subject to tunnel burial depth and tunnel bottom plate PushiCoefficient and roadway floor grooving depth, and having the following relationship: s1＝K1K2d, wherein d is the depth of the cutting groove of the roadway floor, K1Related to the depth of the tunnel, K2Related to the Purchase coefficient of the roadway floor, when 0<When the buried depth of the tunnel is less than or equal to 200m,
Preferably, the distance A between the cutting tool of the inner chain arm saw continuous cutting machine and the inner side of the roadway1Distance A between cutting tool of outer chain arm saw continuous cutting machine and outer side of roadway2All are influenced by the uniaxial compressive strength of the coal seam, and the compressive strength is 0<When the uniaxial compressive strength of the coal seam is less than or equal to 5GPa, A1>100mm，A2>200 mm; when the pressure is 5GPa<When the uniaxial compressive strength of the coal seam is less than or equal to 15GPa, A1＝80-100mm，A2150-; uniaxial compressive strength of coal seam>At 15GPa, A1＝50-80mm，A2＝100-150mm。
Preferably, the cutting tool chain speed v1And the width D of the cutting tool is related to the Purchase system of the roadway floor, when 0<V when the Purchase coefficient of the roadway floor is less than or equal to 413m/s, and D150 mm; when 4 is present<V when the Purchase coefficient of the roadway floor is less than or equal to 812m/s, and 80 mm; coefficient of prest when roadway floor>At 8 times, v1＝1.5m/s，D＝50mm。
Preferably, the cutting tools of the two chain arm saw continuous cutting machines advance to the center line of the roadway by a distance S2Related to the horizontal stress of the roadway, when 0<When the horizontal stress is less than or equal to 5MPa, S250-85 mm; when the pressure is 5MPa<When the horizontal stress is less than or equal to 15MPa, S285-120 mm; horizontal stress>15MPa, S2＝120-150mm。
Preferably, the grooving depth d is related to the Pythian coefficient of the bottom plate, and when 0< the Pythian coefficient of the roadway bottom plate is less than or equal to 3, d is 6-7 m; when the Purchase coefficient of the 3< roadway floor is less than or equal to 6, d is 4-6 m; when the Purchase coefficient of the roadway floor is greater than 6, d is 2.5-4 m.
Preferably, the two chain arm saw continuous cutting machines move to the other end of the roadway by a distance S3In relation to the depth d of the cut when 0<When the depth of the cutting groove is less than or equal to 3m, S31.0d-1.2 d; when it is 3m<When the depth of the cutting groove is less than or equal to 5m, S31.2-1.5 d; when the depth of the cutting groove is>At 5m, S3＝1.5d。
More preferably, the cutting knife has a uniform velocity v2Related to the Purchase coefficient of the roadway floor, when 0<When the Purchase coefficient of the roadway bottom plate is less than or equal to 3, the rotating speed v of the cutting tool22.5 to 3.0 degrees/min; when 3 is<When the Purchase coefficient of the roadway floor is less than or equal to 6, the rotating speed v of the cutting tool21.5-2.5 degree/min; coefficient of prest when roadway floor>6 hours, cutting tool rotation speed v2Is 0.5-1.5 degree/min.
Has the advantages that: the chain arm saw continuous cutting machine adopts a fixed-point circle-drawing mode to cut a roadway bottom plate, is high in grooving efficiency, small in surrounding rock disturbance, large in grooving depth and good in pressure relief effect, can effectively prevent and control the floor heave phenomenon of the roadway during the stoping of a working face, improves the stability of the roadway and improves the production yield of coal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural view of a blank working surface according to the present invention;
FIG. 2 is a cross-sectional view of I-I of the present invention;
FIG. 3 is a schematic structural view of the roadway floor after the cutting is completed;
the reference numerals in the figures are intended to indicate: 1. the chain arm saw continuous cutting machine comprises a chain arm saw continuous cutting machine, 2, an inner side of a roadway, 3, an outer side of the roadway, 4, a central line of the roadway, 5, a crawler traveling device, 6, a cutting tool and 7, a tool chain.
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 embodiments of the present invention, and not all of the 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.
The invention relates to a method for controlling floor heave of an open roadway based on chain arm sawing groove pressure relief, which comprises the following steps:
a. placing two chain arm saw
b. simultaneously starting the two chain arm saw
c. starting the cutting tools 6 of the two chain arm saw
d. moving the cutting tools 6 of the two chain arm saw
the accumulated width H of the cutting groove is related to the horizontal stress of the roadway, the uniaxial compressive strength of the bottom plate, the width of the roadway and the depth of the cutting groove, and the calculation mode is as follows:
e. The two chain arm saws
f. and repeating the steps a-e to carry out the next round of cutting until the whole roadway bottom plate is cut.
The two chain arm saw
Distance A between cutting tool 6 of inner chain arm saw
Cutting tool 6 chain speed v1The width D of the cutting tool 6 is related to the Purchase system of the roadway floor, when 0<V when the Purchase coefficient of the roadway floor is less than or equal to 413m/s, and D150 mm; when 4 is present<V when the Purchase coefficient of the roadway floor is less than or equal to 812m/s, and 80 mm; coefficient of prest when roadway floor>At 8 times, v1＝1.5m/s，D＝50mm。
The propelling distance S2 of the cutting tool 6 of the two chain arm saw
The depth d of the cutting groove is related to the Pythian coefficient of the bottom plate, and when the Pythian coefficient of the roadway bottom plate is 0< and is not more than 3, d is 6-7 m; when the Purchase coefficient of the 3< roadway floor is less than or equal to 6, d is 4-6 m; when the Purchase coefficient of the roadway floor is greater than 6, d is 2.5-4 m.
Two chain arm saw
Uniform speed v of cutting tool 62Related to the Purchase coefficient of the roadway floor, when 0<When the Purchase coefficient of the roadway bottom plate is less than or equal to 3, the rotating speed v of the cutting tool 622.5 to 3.0 degrees/min; when 3 is<When the Purchase coefficient of the roadway bottom plate is less than or equal to 6, the rotating speed v of the cutting tool 621.5-2.5 degree/min; coefficient of prest when roadway floor>6 hours, the cutting tool 6 rotates at a speed v2Is 0.5-1.5 degree/min.
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