CN104832163A - Method for monitoring rock burst dangerousness in coal underground mining process - Google Patents

Method for monitoring rock burst dangerousness in coal underground mining process Download PDF

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Publication number
CN104832163A
CN104832163A CN201510258123.XA CN201510258123A CN104832163A CN 104832163 A CN104832163 A CN 104832163A CN 201510258123 A CN201510258123 A CN 201510258123A CN 104832163 A CN104832163 A CN 104832163A
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monitoring
radon
bump
rock
exploration
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CN201510258123.XA
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CN104832163B (en
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兰天伟
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Liaoning Technical University
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Liaoning Technical University
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/18Special adaptations of signalling or alarm devices

Abstract

The invention belongs to the technical field of coil mining, and particularly relates to a method for monitoring rock burst dangerousness in the coal underground mining process. According to the method, two detection holes are formed in the two sides of a strong rock burst dangerous region, sensors for monitoring the concentration of radon are installed in the deep coal and rock mass positions in the two detection holes, the sensors acquire the concentration of radon from rock masses under the surrounding rock pressure change, radon concentration measurement value data returned back through the sensors arranged in the two detection holes and used for monitoring the concentration of radon are recorded a time every 10 min to 15 min, the monitored data within an hour are averaged, average data serve as monitoring sample data, the data are monitored continuously till a work face is completely exploited, and according to the monitored concentration measurement value data change trend of radon released from the rock masses in the two detection holes, the dangerousness probability of rock burst occurrence is judged. The problems that information interference, high investment cost and the like existing in common mine well rock burst dangerousness monitoring are solved, and the predicting method is simple, practical, low in equipment cost and easy to operate.

Description

The monitoring method of bump danger in a kind of coal mine underground exploitation
Technical field
The invention belongs to Coal Mining Technology field, be specifically related to the monitoring method of bump danger in the exploitation of a kind of coal mine underground.
Background technology
Bump is the world-class sciences problems of coal mine underground engineering and rock mechanics field.Coal superficial part resource is day by day exhausted, and proceeding to deep mining gradually becomes inexorable trend.Deep mining, the dynamic environment condition residing for coal and rock is all the more complicated, and strata behaviors is more frequent, the coal seam having more mine is had bump danger, the fracture strength of bump in deep part also can be made larger.
Effective improvement of bump is the prerequisite of carrying out safe working, and the accurate measurements of bump danger is the top priority of preventing and controlling.The monitoring of current bump danger comprises area monitoring and some monitoring, and the method for employing mainly contains electromagnetic radiation method, micro seismic monitoring method, monitoring ground sound method, mining induced stress monitoring method and coal powder quantity of bore index method etc.Along with the increase of mining depth, need to take 2 kinds or monitoring measure of more than two kinds in specific implementation process, there is input cost high, operating difficulties, the inconvenience of some measure site operations, and by the problem of ambient environmental factors interference effect serious (as blow out, drill, rail transport etc.), there is gross error in monitoring result, forecasting accuracy is low, causes the weak effect separating danger enforcement.Therefore need to set up a kind of be applicable to Rock Burst danger forecasting simple and practical, equipment manufacturing cost is low, be easy to the monitoring method that operates.
Summary of the invention
For prior art Problems existing, the invention provides the monitoring method of bump danger in the exploitation of a kind of coal mine underground, object is by the precursor information of the radon consistence of radgas in the coal and rock of mine change as Prediction of Rock Burst, to propose a kind of newly, with low cost, be easy to operate, by environmental disturbances, the dangerous monitoring method of bump that predictablity rate is high.
The technical scheme realizing the object of the invention is carried out according to following steps:
(1) exploration hole of radon consistence monitoring is arranged:
Complete mining system work plane is formed in coal mine underground recovery process, according to mining system stress distribution feature, the both sides in hazardous area are pressed to arrange 2 exploration holes at the thump apart from work plane 130 ~ 170m, wherein the 1st exploration hole is arranged apart from work plane≤100m place, and the 2nd exploration hole is arranged in apart from work plane >=200m place;
(2) radon concentration monitoring instrument is arranged:
By the coal and rock deep of sensor placement in two exploration holes of monitoring radon consistence, sensor obtains radon gas bulk concentration from the rock mass pressure from surrounding rock change, adopts polyurethane foam material and hole packer to carry out sealing pores to exploration hole;
(3) radon consistence change is monitored:
The radon consistence magnitude data that the sensor of monitoring radon consistence in two exploration holes returns recorded, every 10 ~ 15 min records once, average to the monitored data in 1h, as monitor sample data, monitoring is until working face mining is complete continuously;
(4) the dangerous probability of bump is judged according to monitor sample data:
According to the radon consistence magnitude data variation tendency discharged in the rock mass monitored in two exploration holes, judge the dangerous probability that bump occurs;
Wherein, in the 1st exploration hole of nearly work plane, in rock mass there is reduction trend in radon consistence monitor sample data in time, the probability that bump occurs in representative becomes large, occur rising trend in time in the radon consistence monitor sample data of the 2nd exploration hole away from work plane, the probability that bump occurs in representative becomes large simultaneously;
When the radon consistence monitor sample data of two exploration holes do not change in time, so work plane is safe working work plane;
When bump probability occurring and becoming large, take local danger releasing measures release solution danger, until the radon consistence in exploration hole recovers stable equilibrium state.
Compared with prior art, feature of the present invention and beneficial effect are:
(1) the inventive method solves and usually rushes mine and press with hitting in dangerous monitoring and there is the problems such as information interference, input cost are high, propose a kind of simple and practical, equipment cost is low, be easy to the monitoring method that operates;
(2) the present invention utilizes the precursor information of burst size as rock burst hazard prediction of radon gas body in coal and rock, by the monitoring changed the radon consistence of mine coal rock mass, achieves the Accurate Prediction of bump danger;
(3) the present invention is utilizing radon consistence change on the dangerous Accurate Prediction basis of Rock Burst, takes local release danger releasing measures in advance, achieves the safety coal extraction of work plane.
Accompanying drawing explanation
Fig. 1 is that in the monitoring method of bump danger in coal mine underground of the present invention exploitation, exploration hole arranges schematic diagram;
In figure: 1: upper crossheading; 2: coal body; 3: pressure hazardous area, thump ground; 4: work plane; 5: goaf; 6: exploration hole; 7: calculating instrument; 8: sensor; 9: area of stress concentration; 10: lower crossheading;
CD correspondence position is compressional zone; AC and BD correspondence position is unload zone;
Fig. 2 be thump in Fig. 1 press the vertical section figure of hazardous area rock mass stress;
Wherein: ↓ represent action of underground direction; → represent radon gas moving direction; Rn represents radon concentration;
Fig. 3 is thump ground rock mass distribution of force variation diagram when pressing hazardous area that bump occurs;
Wherein: P represents ultimate stress;
Fig. 4 is thump ground radon concentration changes in distribution figure when pressing hazardous area that bump occurs;
Rear radon concentration distribution map is there is in Fig. 5 for impacting low pressure.
Detailed description of the invention
The sensor model number of the measurement radon gas adopted in the embodiment of the present invention is FD-3017A type RaA emanometer.
The present embodiment technical scheme is carried out according to following steps:
(1) exploration hole of radon consistence monitoring is arranged:
Complete mining system work plane is formed in coal mine underground recovery process, as shown in Figure 1, comprise complete upper crossheading 1, lower crossheading 10, goaf 5, work plane 4 and coal body 2, according to mining system stress distribution feature, press hazardous area 3 with defining thump, and mark off compressional zone CD and unload zone AC, BD;
The both sides in hazardous area 3 are pressed to arrange 2 exploration holes 6 at thump, wherein the 1st exploration hole is arranged apart from work plane 60m place, 2nd exploration hole is arranged in apart from work plane 250m place, exploration hole 6 diameter 42mm, the elevation angle is 3 ° ~ 5 °, according to roadway surrounding rock stress distribution, the inspecting hole degree of depth is 3 ~ 5 times of span length, 10 ~ 15m;
(2) radon concentration monitoring instrument is arranged:
The sensor 8 of monitoring radon consistence is placed in the coal and rock deep in two exploration holes 6, sensor 8 obtains radon gas bulk concentration from the rock mass pressure from surrounding rock change, polyurethane foam material and hole packer is adopted to carry out sealing pores to exploration hole 6, sealed borehole length >=8m;
(3) radon consistence change is monitored:
The radon consistence magnitude data that the sensor 8 of monitoring radon consistence in two exploration holes returns recorded, every 10 ~ 15 min records once, average to the monitored data in 1h, as monitor sample data, monitoring is until working face mining is complete continuously;
(4) the dangerous probability of bump is judged according to monitor sample data:
According to the radon consistence magnitude data change discharged in the rock mass monitored in two exploration holes, judge the dangerous probability that bump occurs;
Wherein, as shown in Figure 2, rock mass is under the effect of mine pressure, produce 2 special regions, compressional zone CD and unload zone AC and BD, under the condition that mine pressure load raises, there is a large amount of crackles in compressional zone CD and with the gathering of radon gas in crackle, meanwhile, crackle produces and is out of shape and makes radon " extrusion " enter unload zone along → direction by compressional zone, as shown in Figure 4, the radon consistence of compressional zone CD continues to reduce, and the radon consistence of unload zone continues to increase, when load continues to increase, the radon consistence of the radon consistence reduction and unload zone that cause compressional zone is further increased, when the mine pressure value located sometime oversteps the extreme limit the maximum value of stress, press in hazardous area 3 bump will occur at thump, as shown in Figure 3, in this case, the crackle that compressional zone causes sharply increases, and radon gas start to → to mobile in the other direction, radon consistence in compressional zone is increased, compressional zone becomes actual unload zone after bump occurs, as shown in Figure 5, radon consistence gradually in two regions has turned back to original state,
Therefore, in the 1st exploration hole of nearly work plane, in rock mass there is reduction trend in radon consistence monitor sample data in time, the probability that bump occurs in representative becomes large, occur rising trend in time in the radon consistence monitor sample data of the 2nd exploration hole away from work plane, the probability that bump occurs in representative becomes large simultaneously;
When the radon consistence monitor sample data of two exploration holes do not change in time, so work plane is safe working work plane;
When bump probability occurring and becoming large, take local danger releasing measures release solution danger, until the radon consistence in exploration hole recovers stable equilibrium state.

Claims (3)

1. the monitoring method of bump danger in coal mine underground exploitation, is characterized in that carrying out according to following steps:
(1) exploration hole of radon consistence monitoring is arranged:
Complete mining system work plane is formed in coal mine underground recovery process, according to mining system stress distribution feature, press the both sides in hazardous area to arrange 2 exploration holes at thump, wherein the 1st exploration hole is arranged apart from work plane≤100m place, and the 2nd exploration hole is arranged in apart from work plane >=200m place;
(2) radon concentration monitoring instrument is arranged:
By the coal and rock deep of sensor placement in two exploration holes of monitoring radon consistence, sensor obtains radon gas bulk concentration from the rock mass pressure from surrounding rock change, carries out sealing pores to exploration hole;
(3) radon consistence change is monitored:
The radon consistence magnitude data that the sensor of monitoring radon consistence in two exploration holes returns recorded, every 10 ~ 15 min records once, average to the monitored data in 1h, as monitor sample data, monitoring is until working face mining is complete continuously;
(4) the dangerous probability of bump is judged according to monitor sample data:
According to the radon consistence magnitude data variation tendency discharged in the rock mass monitored in two exploration holes, judge the dangerous probability that bump occurs;
Wherein, in the 1st exploration hole of nearly work plane, in rock mass there is reduction trend in radon consistence monitor sample data in time, the probability that bump occurs in representative becomes large, occur rising trend in time in the radon consistence monitor sample data of the 2nd exploration hole away from work plane, the probability that bump occurs in representative becomes large simultaneously;
When the radon consistence monitor sample data of two exploration holes do not change in time, so work plane is safe working work plane;
When bump probability occurring and becoming large, take local danger releasing measures release solution danger, until the radon consistence in exploration hole recovers stable equilibrium state.
2. the monitoring method of bump danger in a kind of coal mine underground exploitation according to claim 1, presses hazardous area apart from work plane 130 ~ 170m with it is characterized in that described thump.
3. the monitoring method of bump danger in a kind of coal mine underground exploitation according to claim 1, is characterized in that described sealing pores adopts polyurethane foam material and hole packer.
CN201510258123.XA 2015-05-20 2015-05-20 The dangerous monitoring method of bump in a kind of coal mine underground exploitation Active CN104832163B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105626070A (en) * 2015-12-14 2016-06-01 辽宁工程技术大学 Rock burst prevention method through deep hole blasting and depressurizing
CN108825303A (en) * 2018-04-23 2018-11-16 西安科技大学 A kind of coal working face erosion control release effect detection method
CN112709602A (en) * 2020-12-16 2021-04-27 中国矿业大学 Surrounding rock loosening ring measuring method based on radon gas evolution concentration
CN112855123A (en) * 2021-01-19 2021-05-28 兖州煤业股份有限公司 Method for determining depth of large-diameter pressure relief drill hole

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CN103277137A (en) * 2013-05-24 2013-09-04 山东科技大学 Forecasting method for gas outburst of tunneling coal roadway
CN103558646A (en) * 2013-10-31 2014-02-05 中国矿业大学 Method of detecting dynamic developmental situation of overburden mining-induce fissure in radon gas earth surface
CN103591922A (en) * 2013-11-28 2014-02-19 中国矿业大学 Method for detecting upper coal seam floor damage depth radon gas in close-distance coal seam mining
CN104360405A (en) * 2014-12-02 2015-02-18 中国矿业大学 Comprehensive detection method for dynamic movement characteristics of overlying strata in site

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101393144A (en) * 2008-10-20 2009-03-25 成都理工大学 Multi-point diffusion type alpha energy spectrum cumulated soil radon measuring method
US20120018151A1 (en) * 2010-05-25 2012-01-26 Ide Suguru T Inert gas injection to help control or extinguish coal fires
CN202578785U (en) * 2012-02-06 2012-12-05 成都理工大学 Stratum subsidence pre-warning system in coal mining process
CN202661301U (en) * 2012-04-13 2013-01-09 太原理工大学 All-weather underground radon gas sampling device
CN103277137A (en) * 2013-05-24 2013-09-04 山东科技大学 Forecasting method for gas outburst of tunneling coal roadway
CN103558646A (en) * 2013-10-31 2014-02-05 中国矿业大学 Method of detecting dynamic developmental situation of overburden mining-induce fissure in radon gas earth surface
CN103591922A (en) * 2013-11-28 2014-02-19 中国矿业大学 Method for detecting upper coal seam floor damage depth radon gas in close-distance coal seam mining
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105626070A (en) * 2015-12-14 2016-06-01 辽宁工程技术大学 Rock burst prevention method through deep hole blasting and depressurizing
CN108825303A (en) * 2018-04-23 2018-11-16 西安科技大学 A kind of coal working face erosion control release effect detection method
CN112709602A (en) * 2020-12-16 2021-04-27 中国矿业大学 Surrounding rock loosening ring measuring method based on radon gas evolution concentration
CN112709602B (en) * 2020-12-16 2021-10-29 中国矿业大学 Surrounding rock loosening ring measuring method based on radon gas evolution concentration
CN112855123A (en) * 2021-01-19 2021-05-28 兖州煤业股份有限公司 Method for determining depth of large-diameter pressure relief drill hole

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