CN-117868821-B - Pressure relief device and method for coal mine tunnel coal seam tunneling

CN117868821BCN 117868821 BCN117868821 BCN 117868821BCN-117868821-B

Abstract

The invention discloses a coal mine tunnel coal seam tunneling pressure relief device and method, wherein the pressure relief device comprises a crawler tractor and a drill rod, the drill rod comprises a drill rod body, a first oil cavity and a second oil cavity, the first oil cavity is formed in the length direction of the drill rod body, the second oil cavity is formed in the radial direction of the drill rod body and is communicated with the first oil cavity, a piston rod is adapted in the second oil cavity and can move in a switching mode between an extending position extending out of the second oil cavity and a contracting position contracting in the second oil cavity, a first grouting pipe is arranged in the extending direction of the first oil cavity, a second grouting pipe is arranged in the extending direction of the second oil cavity and is communicated with the first grouting pipe, the second grouting pipe sequentially penetrates through the second oil cavity and the piston rod, when a drilled hole of the drill rod body needs to be fractured, the piston rod is switched from the contracting position to the contracting position so as to form a fracturing hole, and when the hard coal body needs to be depressurized, silent expansion liquid is sequentially injected into the fracturing hole through the first grouting pipe and the second grouting pipe.

Inventors

LI GUICHEN
SUN YUANTIAN
WANG SHANG
YANG SEN
HAO HAORAN
LI JINGHUA
CHEN CONG
TIAN BOWEN
LU ZHONGCHENG

Assignees

中国矿业大学

Dates

Publication Date: 20260512
Application Date: 20240121

Claims (8)

1. The coal mine tunnel coal seam tunneling pressure relief device comprises a crawler tractor (100) and a drill rod 200, and is characterized in that, The drill rod (200) comprises: A drill rod body (210); A first oil cavity (220) which is extended along the length direction (X) of the drill rod body (210) and a second oil cavity (230) which is opened along the radial direction (Y) of the drill rod body (210) and is communicated with the first oil cavity (220), wherein a piston rod (240) is adapted in the second oil cavity (230), and the piston rod (240) can be switched to move between an extending position which extends out of the second oil cavity (230) and a contracting position which contracts in the second oil cavity (230); A first grouting pipe (250) arranged along the extending direction of the first oil cavity (220) and a second grouting pipe (260) arranged along the extending direction of the second oil cavity (230) and communicated with the first grouting pipe (250), wherein the first grouting pipe (250), the second grouting pipe (260) and the first oil cavity (220) are not communicated with each other, the second oil cavity (230) is not communicated with each other, the second grouting pipe (260) sequentially penetrates through the second oil cavity (230) and a piston rod (240), the second grouting pipe (260) comprises a grouting pipe body (243), a grouting channel (244) arranged along the extending direction of the piston rod (240), one end of the grouting pipe body (243) is communicated with the first grouting pipe (250), the other end of the grouting pipe body (243) is communicated with the grouting channel (244), the grouting pipe body (243) is a flexible telescopic piece, the grouting pipe body (243) and the grouting channel (244) and the second end of the grouting pipe (230) and the piston rod (240) are far away from the first end (240) can be switched to the position (240) at which the piston rod (240) is far from the first end (240), when the end cover (270) is in the open position, the piston rod (240) injects silent expansion liquid into the fracturing hole, and when the end cover (270) is in the closed position, the piston rod (240) is positioned in the second oil cavity (230) or fractures the drilling hole (410); When the drill hole (410) drilled by the drill rod body (210) needs to be fractured, the piston rod (240) is switched from the contracted position to the extended position to form a fracturing hole, and when the hard coal body needs to be depressurized, silent expansion liquid is injected into the fracturing hole through the first grouting pipe (250) and the second grouting pipe (260) in sequence.
2. The coal mine tunnel coal seam tunneling pressure relief device according to claim 1, wherein, The second oil cavities (230) comprise a plurality of second oil cavities and are arranged in an array along the circumferential direction (Z) and the length direction (X) of the drill rod body (210), and the piston rods (240) are in one-to-one correspondence with the second oil cavities (230).
3. The coal mine tunnel coal seam tunneling pressure relief device according to claim 1, wherein, One end of the end cover (270) is pivotally connected to the piston rod (240), the other end of the end cover (270) is connected to one end of an elastic member (271), and the other end of the elastic member (271) is connected to the piston rod (240) to achieve an elastic force capable of returning to a closed position when the end cover (270) is in an open position.
4. The coal mine tunnel coal seam tunneling pressure relief device according to claim 3, The end cover (270) comprises a plurality of end covers (270), one ends of the plurality of end covers (270) are sequentially arranged along the circumferential direction (Z) of the piston rod (240) and are hinged with the piston rod (240), and the other ends of the plurality of end covers (270) are sequentially spliced and abutted under the action of the elastic piece (271) so as to seal the grouting channel (244).
5. The coal mine tunnel coal seam tunneling pressure relief device according to claim 1, wherein, The piston rod (240) comprises: A plug body (241) movably connected in the second oil cavity (230) and separating the second oil cavity (230) to form a first chamber (231) and a second chamber (232), wherein the first chamber (231) is communicated with the first oil cavity (220); The rod body (242) is positioned in the second cavity (232) and extends from the plug body (241) towards the direction away from the plug body (241) to form a first end and a second end which are opposite, the first end is fixedly connected with the plug body (241), the second end is connected with the end cover (270), and the grouting channel (244) is not communicated with the second cavity (232).
6. A pressure relief method for a coal mine tunnelling pressure relief device as claimed in any one of claims 1 to 5, comprising the steps of: S10, moving the crawler tractor (100) to a head-on position, and driving the drill rod (200) to drill a drill hole (410) by the crawler tractor (100); S20, pumping hydraulic oil into the first oil cavity (220), pushing the piston rod (240) to move from the contracted position to the extended position through the second oil cavity (230), and forming a fracturing hole on the wall of the drilling hole (410) through the piston rod (240); S30, pumping silent expansion liquid into the first grouting pipe (250), and injecting the silent expansion liquid into the fracturing hole through the second grouting pipe (260) to finish pressure relief and coal crushing; and S40, repeating the steps S10 to S30 to realize pressure relief and coal crushing of the drilling holes (410) at other positions.
7. The pressure relief method of a coal mine tunnel coal seam tunnelling pressure relief device as claimed in claim 6, wherein, In step S30, the method further includes pumping a silent expansion liquid into the first grouting pipe (250): Hydraulic oil is injected into the second oil chamber (230) to push the piston rod (240) to move from the extended position to the contracted position so as to ensure full injection of the silent expansion liquid.
8. The pressure relief method of the coal mine tunnel coal seam tunneling pressure relief device according to claim 6, wherein in step S30, the silent expansion liquid is formed by adding a proper amount of water to the silent expansion agent for stirring based on the hardness of the coal wall and the change of the air temperature, and the silent expansion liquid needs to be injected into the fracturing hole within 5-10 min after the stirring is completed.

Description

Pressure relief device and method for coal mine tunnel coal seam tunneling Technical Field The invention relates to the technical field of mining, in particular to a device and a method for tunneling and pressure relief of coal seams of coal mine tunnels. Background With the increasing demand for mineral products and the increasing exhaustion of shallow resources, most mines enter deep mining stages successively. With increasing mining depth, high ground stress features gradually appear, such as rock burst, large deformation of soft rock roadway, hard rock burst, rheology and the like. Rock burst, also called rock burst, is a phenomenon often accompanied by mining of hard coal seams of coal mines, is a phenomenon that accumulated elastic deformation potential energy in rock mass is suddenly and violently released under certain conditions to cause burst and ejection of rock, rock burst is one of main potential safety hazards faced by deep mine, prevention and prevention work of the rock burst is one of important work of mining deep coal mines, tunneling of the deep hard coal seams is often accompanied by rock burst, and at present, rock burst prevention and prevention methods aiming at the rock burst are used for relieving pressure of rock stratum in a multi-purpose coal seam water injection mode, but when water injection is carried out, due to small inter-rock stratum gaps, pressure water permeation speed and range are poor, meanwhile, after water injection, effective monitoring of rock stratum deformation in water injection drilling holes is lacked, pressure change of rock stratum at water injection positions cannot be found in time, and effective prevention and treatment work of rock burst is affected. Drilling pressure relief is a method commonly used at present, but the problems of large drilling workload, high labor and time consumption, high cost and the like are also caused. On the one hand, the method has serious threat to the life danger of workers, and on the other hand, the exploitation efficiency is reduced, and the coal yield of the coal mine is limited, so that the method is rarely used. Disclosure of Invention Aiming at the problems and the requirements, the proposal provides the pressure relief device and the pressure relief method for the coal seam tunneling of the coal mine tunnel, which can realize the technical purposes and bring other multiple technical effects due to the following technical characteristics. The invention aims to provide a coal seam tunneling pressure relief device for a coal mine tunnel, which comprises a crawler tractor and a drill rod, The drill rod comprises: A drill rod body; A first oil cavity extending along the length direction of the drill rod body and a second oil cavity extending along the radial direction of the drill rod body and communicated with the first oil cavity are arranged, wherein a piston rod is adapted in the second oil cavity and can switch between an extending position extending out of the second oil cavity and a contracting position contracting in the second oil cavity; The first grouting pipe is arranged along the extending direction of the first oil cavity, the second grouting pipe is arranged along the extending direction of the second oil cavity and is communicated with the first grouting pipe, the first grouting pipe and the second grouting pipe are not communicated with the first oil cavity and the second oil cavity, and the second grouting pipe sequentially penetrates through the second oil cavity and the piston rod; When the hard coal body is required to be depressurized, silent expansion liquid is sequentially injected into the fracturing holes through the first grouting pipe and the second grouting pipe. In one example of the invention, the second oil cavity comprises a plurality of second oil cavities and is arranged in an array along the circumferential direction and the length direction of the drill rod body, wherein the piston rods are in one-to-one correspondence with the second oil cavities. In one example of the present invention, the second grouting pipe includes: grouting a pipe body; A grouting channel arranged along the extending direction of the piston rod; One end of the grouting pipe body is communicated with the first grouting pipe, and the other end of the grouting pipe body is communicated with the grouting channel, wherein the grouting pipe body is a flexible telescopic piece, so that the sum of the maximum lengths of the grouting pipe body and the grouting channel is larger than the length of the second oil cavity. In one example of the invention, one end of the piston rod, which is away from the first grouting pipe, is further provided with an end cover, and the end cover can be switched between an open position for opening the grouting channel and a closed position for closing the grouting channel, wherein when the end cover is in the open position, the piston rod injects silent expansion liquid into the fracturi