CN113482720A - Mechanized operation line construction process under rock burst condition - Google Patents
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Abstract
The invention discloses a mechanized operation line construction process under the condition of rock burst, which belongs to the technical field of coal mines and comprises the following steps: installing a monitoring and early warning platform in a rock burst mine, and uploading coal body stress monitoring, microseismic monitoring and drilling cutting data monitoring data to the platform; an online rock burst stress monitoring system can be installed in an impact dangerous area divided by a mine, and the accumulation and the change of static load in a mining surrounding rock near-field system are monitored in real time by embedding a high-precision stress sensor in a coal body. The invention utilizes the mastered coal roadway mechanized operation line construction technology to form a large-section coal roadway rapid and efficient mechanized tunneling comprehensive matching technology suitable for coal mine geological conditions, and realizes the purposes of reducing the labor intensity of workers, reducing labor force and improving single advance of the coal roadway with rock burst by scientifically arranging labor organization and optimizing operation procedures, thereby reducing the labor intensity and improving the working efficiency.
Description
Technical Field
The invention relates to a mechanized operation line construction process under the condition of rock burst, and belongs to the technical field of coal mines.
Background
At present, most of mines in China enter deep mining, the problem of rock burst is more and more serious, rock burst is more and more obvious, the progress of mine construction is severely restricted, and a set of mechanical operating line under rock burst is necessary to be researched.
Disclosure of Invention
The invention mainly aims to solve the defects of the prior art and provide a mechanized operation line construction process under the condition of rock burst.
The purpose of the invention can be achieved by adopting the following technical scheme:
the mechanized operation line construction process under the condition of rock burst comprises the following steps:
step 1: installing a monitoring and early warning platform in a rock burst mine, and uploading coal body stress monitoring, microseismic monitoring and drilling cutting data monitoring data to the platform;
step 2: an online rock burst stress monitoring system can be installed in an impact dangerous area divided by a mine, and the accumulation and the change of static load in a mining surrounding rock near-field system are monitored in real time by embedding a high-precision stress sensor in a coal body;
and step 3: two crossheading construction sections of a working face are weak impact dangerous areas, pressure relief holes are drilled on the stoping side and the coal pillar side of the crossheading part in a pressure relief mode according to a service contact book issued by a mine, and pressure relief work is continuously carried along with continuous advancing of a tunneling face;
and 4, step 4: carrying out pressure relief treatment on an area reserved for the bottom coal of a driving roadway on a working face, drilling pressure relief holes on the side of a coal pillar of a bottom plate to relieve pressure, wherein the thickness of the bottom coal of the roadway is more than or equal to 10m, and the length of each drilled hole is 10 m; drilling until rock is found in the area with the thickness of the bottom coal being less than 10 m;
and 5: constructing at an interval of 3.1-3.3 m and a 60-degree angle downwards in a direction perpendicular to the coal slope, constructing pressure relief holes to the bottom plate of the coal seam in a depth of 153mm at a distance of less than or equal to 30m from the head to the head, constructing 3 drilled holes with a hole diameter of 150-155 mm at the head, and horizontally arranging the drilled holes with a hole depth of 50 m; when the distance from the head to the bottom of the pressure relief hole is less than 10m, additionally drilling a next round of drilling holes, and circulating the steps in such a way, and timely sealing the holes after the pressure relief holes are drilled;
step 6: when the tunneling head-on finds impact danger, danger relieving and pressure relief are carried out in an encrypted drilling mode, namely the number of head-on drill holes is increased to 5, and other parameters are consistent with pressure relief parameters;
and 7: when impact dangers are monitored on two sides of a roadway, firstly, a danger range is determined by using a drilling cutting method, then danger relieving measures are taken, during drilling construction, the danger relieving measures are arranged in a staggered mode with pressure relief drilling holes in the prior art, and if the stress concentration degree is high, the large-diameter drilling construction speed is low or danger relieving effects are not obvious, coal seam explosion and danger relieving or other measures should be carried out.
And 8: when the danger of rock burst is monitored on the working face, and the pressure cannot be relieved in time or the pressure relief effect is not obvious by adopting the large-diameter drill hole, the coal bodies can be exploded and relieved in the two sides of the coal bodies along the chute in the dangerous area of the working face, the distance from an initiation point to an explosion place is not less than 300m, and the gun escape time is not less than 30 min.
And step 9: when the danger solving working effect is not ideal, explosion danger solving measures are taken for the roadway bottom plate, the construction positions are the bottom corners of the two sides of the crossheading, and construction is carried out outwards from the position of the coal wall of the working face.
Preferably, the method for detecting the two crossheading tunneling periods of the working face mainly adopts a micro-seismic method, a drilling cutting method and a coal body stress on-line monitoring method and establishes a ledger.
Preferably, the microseismic method monitors: the microseism monitoring method is to adopt a microseism network to carry out on-site real-time monitoring, determine a microseism event by providing the position and the occurrence time of a seismic source, and calculate the released energy; and then the intensity and frequency of the microseismic activity are counted, the potential rock burst rule of the mine dynamic disaster activity is judged by combining the distribution position of the microseismic event, and the risk evaluation and early warning are realized by identifying the rock burst rule of the mine dynamic disaster activity.
Preferably, the drilling cutting method comprises the following specific steps: the drilling cutting method is a method for identifying impact danger by drilling a hole with the diameter of 42mm in a coal seam according to the discharged coal dust amount, the change rule of the coal dust amount and related power effect.
Preferably, the online monitoring method mainly adopts a roof separation instrument and an anchor cable stress meter: the method has the characteristic of continuous monitoring, and can directly obtain the relative stress of the coal rock mass, so that the impact danger degree of a monitoring position can be reflected more intuitively.
Preferably, in the step 3, the hole depth is 18-22 m, the distance is 30-3.3 m, and the distance from the first hole to the head is less than or equal to 50 m.
Preferably, the hole sealing material is loess or cement or the hole sealing is more than or equal to 3 m.
Preferably, the early warning platform adopts double-loop power supply, and is provided with a UPS.
Preferably, during the initial tunneling, the bottom plate is enlarged by 400mm, the floor is expanded by about 400mm after the initial pressing, and the bottom is raised in time by using an explosion-proof excavator.
Preferably, the working face return air crossheading is an impact ground pressure coal roadway mechanized operation line which takes an excavation and anchoring integrated machine, an excavator bottom lifting machine, a drilling machine pressure relief machine, a transfer rubber belt machine and a DSJ800 type rubber belt conveyor as main equipment to continuously discharge gangue.
The invention has the beneficial technical effects that: according to the mechanized operation line construction process under the condition of rock burst, the invention utilizes the grasped coal roadway mechanized operation line construction technology to form a large-section coal roadway rapid and efficient mechanized tunneling comprehensive matching technology suitable for coal mine geological conditions, and through scientific arrangement of labor organization and optimization of operation procedures, the purposes of reducing the labor intensity of workers, reducing labor force and improving single entry of the rock burst coal roadway are achieved, the labor intensity is reduced, the work efficiency is improved, mechanical labor reduction and automatic human change are achieved, the labor intensity can be effectively reduced, and the construction safety is ensured.
Detailed Description
In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail with reference to the following examples, but the embodiments of the present invention are not limited thereto.
The mechanized operation line construction process under the condition of rock burst 1 provided by the embodiment comprises the following steps:
step 1: installing a monitoring and early warning platform in a rock burst mine, and uploading coal body stress monitoring, microseismic monitoring and drilling cutting data monitoring data to the platform;
step 2: an online rock burst stress monitoring system can be installed in an impact dangerous area divided by a mine, and the accumulation and the change of static load in a mining surrounding rock near-field system are monitored in real time by embedding a high-precision stress sensor in a coal body;
and step 3: two crossheading construction sections of a working face are weak impact dangerous areas, pressure relief holes are drilled on the stoping side and the coal pillar side of the crossheading part in a pressure relief mode according to a service contact book issued by a mine, and pressure relief work is continuously carried along with continuous advancing of a tunneling face;
and 4, step 4: carrying out pressure relief treatment on an area reserved for the bottom coal of a driving roadway on a working face, drilling pressure relief holes on the side of a coal pillar of a bottom plate to relieve pressure, wherein the thickness of the bottom coal of the roadway is more than or equal to 10m, and the length of each drilled hole is 10 m; drilling until rock is found in the area with the thickness of the bottom coal being less than 10 m;
and 5: constructing at an interval of 3.1-3.3 m and a 60-degree angle downwards in a direction perpendicular to the coal slope, constructing pressure relief holes to the bottom plate of the coal seam in a depth of 153mm at a distance of less than or equal to 30m from the head to the head, constructing 3 drilled holes with a hole diameter of 150-155 mm at the head, and horizontally arranging the drilled holes with a hole depth of 50 m; when the distance from the head to the bottom of the pressure relief hole is less than 10m, additionally drilling a next round of drilling holes, and circulating the steps in such a way, and timely sealing the holes after the pressure relief holes are drilled;
step 6: when the tunneling head-on finds impact danger, danger relieving and pressure relief are carried out in an encrypted drilling mode, namely the number of head-on drill holes is increased to 5, and other parameters are consistent with pressure relief parameters;
and 7: when impact dangers are monitored on two sides of a roadway, firstly, a danger range is determined by using a drilling cutting method, then danger relieving measures are taken, during drilling construction, the danger relieving measures are arranged in a staggered mode with pressure relief drilling holes in the prior art, and if the stress concentration degree is high, the large-diameter drilling construction speed is low or danger relieving effects are not obvious, coal seam explosion and danger relieving or other measures should be carried out.
And 8: when the danger of rock burst is monitored on the working face, and the pressure cannot be relieved in time or the pressure relief effect is not obvious by adopting the large-diameter drill hole, the coal bodies can be exploded and relieved in the two sides of the coal bodies along the chute in the dangerous area of the working face, the distance from an initiation point to an explosion place is not less than 300m, and the gun escape time is not less than 30 min.
And step 9: when the danger solving working effect is not ideal, explosion danger solving measures are taken for the roadway bottom plate, the construction positions are the bottom corners of the two sides of the crossheading, and construction is carried out outwards from the position of the coal wall of the working face.
The method for detecting the tunneling period of the two crossheading sides of the working face mainly adopts a micro-seismic method, a drilling cutting method and a coal body stress on-line monitoring method and establishes a ledger. Monitoring by a microseismic method: the microseism monitoring method is to adopt a microseism network to carry out on-site real-time monitoring, determine a microseism event by providing the position and the occurrence time of a seismic source, and calculate the released energy; and then the intensity and frequency of the microseismic activity are counted, the potential rock burst rule of the mine dynamic disaster activity is judged by combining the distribution position of the microseismic event, and the risk evaluation and early warning are realized by identifying the rock burst rule of the mine dynamic disaster activity. The drilling cutting method comprises the following specific steps: the drilling cutting method is a method for identifying impact danger by drilling a hole with the diameter of 42mm in a coal seam according to the discharged coal dust amount, the change rule of the coal dust amount and related power effect. The on-line monitoring method mainly adopts a roof separation instrument and an anchor cable stress meter: the method has the characteristic of continuous monitoring, and can directly obtain the relative stress of the coal rock mass, so that the impact danger degree of a monitoring position can be reflected more intuitively.
In the step 3, the hole depth is 18-22 m, the distance is 30-3.3 m, and the distance from the first hole to the head is less than or equal to 50 m. The hole sealing material is loess or cement or the hole sealing is more than or equal to 3 m. The early warning platform adopts the two return circuits power supply, has set up UPS uninterrupted power source. During primary tunneling, the bottom plate is enlarged by 400mm, the floor is expanded by about 400mm after primary pressure is applied, and then the bottom is raised in time by using an explosion-proof excavator. The working face return air crossheading is a mechanical operation line for rock burst coal roadway, which takes an integrated digging and anchoring machine, a digging machine bottom lifting machine, a drilling machine pressure relief machine, a reversed loading rubber belt machine and a DSJ800 type rubber belt conveyor as main equipment to continuously discharge gangue.
In the aspect of rock burst prevention and control, a rock burst monitoring management and early warning system mainly based on drilling cutting detection and stress monitoring and assisted by microseismic monitoring and specially taking large-diameter drilling pressure relief and blasting pressure relief as special pressure relief measures is mainly used for tunneling on two gate roads of a working face, and a standing book is established.
The four-stage monitoring and early warning system of ' mine-mining area-working face-roadway point ' which takes drilling cutting monitoring and stress monitoring as the main and microseismic monitoring as the auxiliary ' is fully utilized. By applying the comprehensive monitoring and early warning method for rock burst such as drilling cuttings, stress, microseismic, mine pressure and the like, the full-coverage dynamic and static load and point-surface combined monitoring and early warning mode of a coal pillar roadway and an excavation roadway is realized. In the aspect of rock burst prevention and control, a method for detecting the two crossheading periods of a working face mainly adopts a microseismic method, a drilling cutting method and a stress on-line monitoring method and establishes a ledger. Monitoring by a microseismic method: the microseism monitoring method is to adopt a microseism network to carry out on-site real-time monitoring, determine a microseism event by providing the position and the occurrence time of a seismic source, and calculate the released energy; and then the intensity and frequency of the microseismic activity are counted, the potential rock burst rule of the mine dynamic disaster activity is judged by combining the distribution position of the microseismic event, and the risk evaluation and early warning are realized by identifying the rock burst rule of the mine dynamic disaster activity. The drilling cutting method comprises the following specific steps: the drilling cutting method is a method for identifying impact danger by drilling a hole with the diameter of 42mm in a coal seam according to the discharged coal dust amount, the change rule of the coal dust amount and related power effect. The coal body stress on-line monitoring method mainly adopts a roof separation instrument and an anchor cable stress meter: the method has the characteristic of continuous monitoring, and can directly obtain the relative stress of the coal rock mass, so that the impact danger degree of a monitoring position can be reflected more intuitively. An online monitoring system for rock burst stress can be installed in an impact dangerous area divided by a mine, a high-precision stress sensor is buried in a coal body, accumulation and change of static load in a near-field system of the mining surrounding rock are monitored in real time, stress or energy states are monitored and warned from an internal cause angle of rock burst, and guidance is provided for reducing and avoiding disasters. At present, two crossheading construction sections of a working face are weak impact dangerous areas, pressure relief holes are drilled at the stoping side and the coal pillar side of the crossheading part according to a service contact book issued by mines in a pressure relief mode, the hole depth is 20m, the distance between every two holes is 3.2m, the first hole distance is not more than 50m from head to head, the pressure relief work is continuously carried along with the continuous propulsion of a tunneling face, when bottom coal is thick, the stress of the two sides is transmitted downwards, a bottom plate coal body becomes a bearing main body, the bottom coal body is easily damaged under the action of dynamic pressure load, and particularly the bottom coal with impact inclination has the characteristics of accumulating elastic energy and generating impact damage. Carrying out pressure relief treatment on an area reserved for the bottom coal of a driving roadway on a working face, drilling pressure relief holes on the side of a coal pillar of a bottom plate to relieve pressure, wherein the thickness of the bottom coal of the roadway exceeds 10m, and drilling holes are 10m long; and drilling until the bottom coal is found in the region with the thickness less than 10 m. Constructing at an interval of 3.2m and obliquely downward 60 degrees vertical to the coal slope, and constructing the pressure relief holes to the bottom plate of the coal bed with a hole diameter of 153mm and a distance of no more than 30m from the head to the head. 3 holes with aperture of 153mm are constructed at the head of the steel pipe, and the steel pipe is horizontally arranged, and the hole depth is 50 m. And when the distance from the tunneling head to the bottom of the pressure relief hole is less than 10m, the next round of drilling is additionally drilled, and the process is circulated, namely the condition that the distance from the tunneling head to the bottom of the pressure relief hole is 10m, namely the pressure relief range is always kept in front of the tunneling head. The pressure relief hole is drilled and timely hole sealing is achieved, the purpose of hole sealing is to prevent the anchor bolt support section of a roadway from being damaged by large-diameter drilling, and spontaneous combustion is avoided due to air leakage in a coal body. The hole sealing material of the large-diameter drill hole can adopt loess, cement or other materials. The hole sealing length is not less than 3 m. When the pressure relief measures of drilling are adopted, safety protection measures for preventing and treating induced impact injury should be made. During the tunneling, monitoring data are analyzed every day, the danger degree of rock burst is comprehensively analyzed, when the monitoring is in danger of impact, the rock burst is reported to a mine dispatching room and an anti-impact department immediately, and pressure relief treatment is carried out on abnormal monitoring areas in time. When the tunneling head-on finds impact danger, danger relieving and pressure relief are carried out in an encrypted drilling mode, namely the head-on drilling is increased to 5, and other parameters are consistent with pressure relief parameters. When impact dangers are monitored on two sides of a roadway, firstly, a danger range is determined by using a drilling cutting method, then danger relieving measures are taken, and during drilling construction, the danger relieving measures and the pressure relief drilling holes are arranged in a staggered mode. If the stress concentration degree is high, the construction speed of the large-diameter drilling is slow or the danger relieving effect is not obvious, coal bed explosion danger relieving or other measures should be implemented. When the danger of rock burst is monitored on the working face, and the pressure cannot be relieved in time or the pressure relief effect is not obvious by adopting the large-diameter drill hole, the coal bodies can be exploded and relieved in the two sides of the coal bodies along the chute in the dangerous area of the working face, the distance from an initiation point to an explosion place is not less than 300m, and the gun escape time is not less than 30 min. Comprehensively considering the pressure relief effect, when the dangerous work solving effect is not ideal, taking explosion-breaking dangerous solving measures aiming at the roadway bottom plate can be considered, the construction positions are the bottom angles of the two sides of the gate way, and construction is carried out outwards from the position of the coal wall of the working face.
In the aspect of mechanical operation line selection, a rock burst coal roadway mechanical operation line with a comprehensive digging machine, an anchor rod drill carriage, a digging machine bottom lifting machine, a drilling machine pressure relief machine, a reversed loading rubber belt machine and a DSJ800 type rubber belt conveyor as main equipment for continuously discharging gangue is adopted in a working face transportation crossheading; the working face return air crossheading is a mechanical operation line for rock burst coal roadway, which takes an integrated digging and anchoring machine, a digging machine bottom lifting machine, a drilling machine pressure relief machine, a reversed loading rubber belt machine and a DSJ800 type rubber belt conveyor as main equipment to continuously discharge gangue.
The roadway excavation is full-section arch-first and slope-last excavation construction, the circulating footage is 0.8m, the minimum control jacking distance is 0.2m, the maximum control jacking distance is 1m, and the empty jacking operation is strictly forbidden.
Monitoring and early warning system
A monitoring and early warning platform is installed in a rock burst mine, monitoring data such as stress monitoring and microseismic monitoring are uploaded to the platform, automatic and multi-parameter combined early warning is realized by utilizing special comprehensive analysis software, and the danger degree of rock burst of each mine is judged. The comprehensive monitoring and early warning platform for tracking the Party A in real time monitors the running condition of the monitoring and early warning system for rock burst of each mine in real time, and ensures early warning treatment to be timely and effective.
The early warning platform adopts the two return circuits power supply, has set up UPS uninterrupted power source, and the scour protection monitoring system special electricity in the pit is special, guarantees each uninterrupted operation of system, and data communication is timely continuous, realizes the real time monitoring and the multi-parameter of mine and synthesizes the early warning, and the conscientious performance monitoring early warning is to the guide effect of scour protection engineering construction.
Stress on-line monitoring
The method has the characteristic of continuous monitoring, and can directly obtain the relative stress of the coal rock mass, so that the impact danger degree of a monitoring position can be more intuitively reflected. By embedding the high-precision stress sensor in the coal body, the accumulation and the change of the static load in the near-field system of the mining surrounding rock are monitored in real time, and the stress or energy state is monitored and warned from the internal cause angle of the occurrence of rock burst, so that guidance is provided for reducing and avoiding disasters. In order to monitor the stress change condition of the roadway coal body, a stress meter is arranged in a dangerous impact dangerous area of medium or above obtained by evaluation.
Designing a roadway stoping slope installation stress meter, wherein the installation parameters are as follows: and taking groups as a unit, arranging two stressmeters in each group according to depth-depth, wherein the distance between the stress gages in each group is 1m, the distance between every two groups is 30m, the installation depth is 8m and 12m, the installation aperture is 42mm, and the primary injection pressure is 5 MPa. 24-hour online transmission is realized, and the on-site impact dangerous state is convenient to master in time.
When the coal body stress monitoring system carries out early warning, the setting of the threshold value needs to be comprehensively determined according to the rock burst theory and the actual conditions of a coal mine site, the determination of the initial early warning value refers to the past monitoring data, and the early warning value is continuously optimized according to the initial application effect during mining. Through the function, ground monitoring center personnel can timely master the possibility of rock burst of the mining working face, and provide basis for scientific organization disaster avoidance and targeted danger relief.
Drill cuttings monitoring
The drilling cutting method is a method for identifying impact danger by drilling a hole with the diameter of 42mm in a coal seam according to the discharged coal dust amount, the change rule of the coal dust amount and related power effect. 2 chip drilling holes are constructed in the front of the tunneling working face, and the reserved safe distance for tunneling is not less than 5m after each detection of the chips. Carrying out drilling cutting monitoring holes on the side roadway of the solid coal in the range of 10-100m behind the heading face of the tunneling working face and 40-120m ahead of the stope working face, and carrying out cyclic detection once per week; the distance between drilling cuttings holes is 10-15m, the diameter of the drilling cuttings hole is 42mm, and the hole depth is 15-20 m.
The regional early warning region with strong impact danger examines once a day, and other regions detect once according to the on-the-spot condition 2 ~ 3 days, arrange 5 or 7 brill bits hole.
In summary, in the present embodiment, according to the mechanized line construction process under the condition of rock burst of the present embodiment, the power consumption required by the energy-saving electrohydraulic system is reduced, and only 1/3 of the pneumatic drilling power loss is used, so that the power loss is small, and energy can be saved. The rock drilling efficiency is high, and is fast through practice contrast, and under same condition and requirement, the rock drilling speed of the hydraulic rock drill for drilling the deep hole improves more than 2 times than the pneumatic rock drill. The working environment is improved, the noise is reduced, and waste gas is not required to be discharged due to hydraulic rock drilling, so that the pollution to the environment caused by oil stains mixed with the waste gas is avoided, the visibility of a working surface is improved, and the operating environment is improved; the hydraulic rock drilling has no exhaust gas sound except metal impact sound, so that the noise can be reduced by 5-10 dB compared with pneumatic rock drilling. After the safety factor of the development machine is improved and coal is cut, the machine-mounted front canopy is adopted as a temporary support to replace a single hydraulic prop temporary support in the traditional process, the operation position of a support worker is far away from a working surface and works under a support body, the empty top operation is prevented, and the safety production is facilitated. Most tasks of reducing labor intensity and occupational hazards are completed by mechanical equipment, and personnel only need to operate a control handle, so that the labor intensity of workers is greatly reduced; the vibration, noise and dust accompanying the construction are less than those of the prior art, and the working environment of workers is improved, so that occupational diseases are reduced. The efficiency is improved, the quality is improved, the supporting work of the working face can be completed by 5 persons, the work efficiency is improved, the construction of the anchor rod and the anchor cable can be completed by one-time pressurization and pre-tightening, and the manual secondary fastening is not needed. The excavator for coal mine is cooperated with the rubber belt conveyor, and has the advantages of high efficiency: the excavator has high bottom lifting mechanization degree and high rock loading speed, and greatly improves the production efficiency. Loading clean rock: the excavator adopts electric full hydraulic transmission, has compact structure, large propelling force and wide digging range, can load rocks in a full section without dead angles and does not need manual assistance to clean the roadway. The limitation is small: the belt conveyor is adopted to convey the gangue, so that the continuous transportation is realized, and the belt conveyor is high in transportation capacity and high in speed. The rock burst coal roadway is constructed by using the advantages of a drilling machine head on and effectively reduces coal explosion sound in the tunneling process, improves the cutting and forming of the roadway and ensures the quality. The tunnel adopts rig construction group portion bottom plate pressure relief vent, effectively reduces the tunnel group, the end is pressed, reduces the tunnel maintenance in later stage.
The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.
Claims (10)
1. The mechanized operation line construction process under the condition of rock burst is characterized by comprising the following steps of:
step 1: installing a monitoring and early warning platform in a rock burst mine, and uploading coal body stress monitoring, microseismic monitoring and drilling cutting data monitoring data to the platform;
step 2: an online rock burst stress monitoring system can be installed in an impact dangerous area divided by a mine, and the accumulation and the change of static load in a mining surrounding rock near-field system are monitored in real time by embedding a high-precision stress sensor in a coal body;
and step 3: two crossheading construction sections of a working face are weak impact dangerous areas, pressure relief holes are drilled on the stoping side and the coal pillar side of the crossheading part in a pressure relief mode according to a service contact book issued by a mine, and pressure relief work is continuously carried along with continuous advancing of a tunneling face;
and 4, step 4: carrying out pressure relief treatment on an area reserved for the bottom coal of a driving roadway on a working face, drilling pressure relief holes on the side of a coal pillar of a bottom plate to relieve pressure, wherein the thickness of the bottom coal of the roadway is more than or equal to 10m, and the length of each drilled hole is 10 m; drilling until rock is found in the area with the thickness of the bottom coal being less than 10 m;
and 5: constructing at an interval of 3.1-3.3 m and a 60-degree angle downwards in a direction perpendicular to the coal slope, constructing pressure relief holes to the bottom plate of the coal seam in a depth of 153mm at a distance of less than or equal to 30m from the head to the head, constructing 3 drilled holes with a hole diameter of 150-155 mm at the head, and horizontally arranging the drilled holes with a hole depth of 50 m; when the distance from the head to the bottom of the pressure relief hole is less than 10m, additionally drilling a next round of drilling holes, and circulating the steps in such a way, and timely sealing the holes after the pressure relief holes are drilled;
step 6: when the tunneling head-on finds impact danger, danger relieving and pressure relief are carried out in an encrypted drilling mode, namely the number of head-on drill holes is increased to 5, and other parameters are consistent with pressure relief parameters;
and 7: when impact dangers are monitored on two sides of a roadway, firstly, a danger range is determined by using a drilling cutting method, then danger relieving measures are taken, during drilling construction, the danger relieving measures are arranged in a staggered mode with pressure relief drilling holes in the prior art, and if the stress concentration degree is high, the large-diameter drilling construction speed is low or danger relieving effects are not obvious, coal seam explosion and danger relieving or other measures should be carried out.
And 8: when the danger of rock burst is monitored on the working face, and the pressure cannot be relieved in time or the pressure relief effect is not obvious by adopting the large-diameter drill hole, the coal bodies can be exploded and relieved in the two sides of the coal bodies along the chute in the dangerous area of the working face, the distance from an initiation point to an explosion place is not less than 300m, and the gun escape time is not less than 30 min.
And step 9: when the danger solving working effect is not ideal, explosion danger solving measures are taken for the roadway bottom plate, the construction positions are the bottom corners of the two sides of the crossheading, and construction is carried out outwards from the position of the coal wall of the working face.
2. The mechanized operation line construction process under the condition of rock burst according to claim 1, wherein the method for detecting the working face during the two-gate tunneling mainly adopts a micro-seismic method, a drilling cutting method and a coal body stress on-line monitoring method and establishes a machine account.
3. The mechanized line construction process under rock burst conditions of claim 2, wherein the microseismic method monitors: the microseism monitoring method is to adopt a microseism network to carry out on-site real-time monitoring, determine a microseism event by providing the position and the occurrence time of a seismic source, and calculate the released energy; and then the intensity and frequency of the microseismic activity are counted, the potential rock burst rule of the mine dynamic disaster activity is judged by combining the distribution position of the microseismic event, and the risk evaluation and early warning are realized by identifying the rock burst rule of the mine dynamic disaster activity.
4. The mechanized line construction process under rock burst conditions of claim 2, wherein the drill cuttings method comprises: the drilling cutting method is a method for identifying impact danger by drilling a hole with the diameter of 42mm in a coal seam according to the discharged coal dust amount, the change rule of the coal dust amount and related power effect.
5. The mechanized operation line construction process under rock burst conditions of claim 2, wherein the online monitoring method mainly adopts a roof separation instrument and an anchor cable strain gauge: the method has the characteristic of continuous monitoring, and can directly obtain the relative stress of the coal rock mass, so that the impact danger degree of a monitoring position can be reflected more intuitively.
6. The mechanized operation line construction process under the condition of rock burst according to claim 1, wherein in the step 3, the hole depth is 18-22 m, the distance is 30-3.3 m, and the first hole pitch is less than or equal to 50m from the head to the head.
7. The mechanized operation line construction process under the condition of rock burst according to claim 1, wherein the hole sealing material is loess or cement or the hole sealing is more than or equal to 3 m.
8. The mechanized operation line construction process under the condition of rock burst according to claim 1, wherein the early warning platform is powered by double loops and provided with an Uninterruptible Power Supply (UPS).
9. The process of claim 1, wherein the floor is enlarged by 400mm during the initial driving, and is raised by about 400mm after the initial pressing, and then raised in time by an explosion-proof excavator.
10. The process of claim 1, wherein the working face return air is a continuous gangue discharge rock burst coal roadway mechanized line mainly comprising a digging and anchoring all-in-one machine, a digging machine bottom lifting machine, a drilling machine pressure relief machine, a transfer adhesive tape machine and a DSJ800 type adhesive tape conveyor.
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