CN105626150A - Micro-seismic monitoring-based gob-side excavation roadway dynamic monitoring and stability evaluating method - Google Patents

Micro-seismic monitoring-based gob-side excavation roadway dynamic monitoring and stability evaluating method Download PDF

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Publication number
CN105626150A
CN105626150A CN201610079154.3A CN201610079154A CN105626150A CN 105626150 A CN105626150 A CN 105626150A CN 201610079154 A CN201610079154 A CN 201610079154A CN 105626150 A CN105626150 A CN 105626150A
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China
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tunnel
monitoring
microseismic event
along
driuing
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CN201610079154.3A
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Chinese (zh)
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CN105626150B (en
Inventor
李术才
王�琦
王雷
任尧喜
江贝
孙会彬
潘锐
秦乾
张若祥
崔常兴
徐奴文
王德超
丁国利
姜作华
邹玉龙
王富奇
郭念波
王保齐
刘文江
张建
肖国强
高松
于恒昌
邵行
胥洪彬
栾英成
高红科
常涛
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山东大学
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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 discloses a micro-seismic monitoring-based gob-side excavation roadway dynamic monitoring and stability evaluating method. The method comprises the following steps: 1, installing a high-precision micro-seismic monitor system in a gob-side excavation roadway; 2, acquiring the positions, energy and frequency of surrounding rock cracking micro-seismic events; 3, distributing a plurality of roadway cross section convergence monitoring stations, acquiring the cross section convergence numerical values of a solid coal side and a gob-side side of a roadway, and calculating the average convergence value of the cross sections of the solid coal side and the gob-side side of the roadway; 4, selecting an anchor rod or an anchor rope to perform a pull-out test on the gob-side side and the solid coal side respectively, and calculating the average drawing force of the anchor rod or the anchor rope; 5, calculating the increment rate of the energy of cumulative micro-seismic events, the increment rate of energy density of micro-seismic events in unit volume, the increment rate of the frequency of the cumulative micro-seismic events, the reduction rate of the average drawing force of the anchor rod or the anchor rope, and the increment rate of the average convergence amount of the cross sections; 6, based on various evaluation values obtained in the step 5, establishing a comprehensive quantitative evaluation index of the gob-side excavation roadway, and performing quantitative evaluation on the stability of the gob-side excavation roadway.

Description

A kind of driuing along goaf tunnel dynamic monitoring based on micro seismic monitoring and Stability Assessment method
Technical field
The invention belongs to security technology area in underground engineering, particularly to a kind of driuing along goaf tunnel dynamic monitoring based on micro seismic monitoring and Stability Assessment method.
Background technology
Gob side entry driving is to stay at edge, goaf to set 3-10m coal column, roadway layout is being located close to the low stress area of coal column side, can effectively reduce roadway deformation, easily safeguard, improve Drift stability, the wasting of resources can be prevented effectively from simultaneously, become commonly used tunnelling mode, but it is as the coal mining degree of depth to increase, crustal stress is stepped up, under complicated geological conditions, tunnel along goaf driving will appear from gross distortion, support unit lost efficacy, gob side entry driving fender is broken serious, Surrounding Rock Strength reduces, drastically influence Drift stability, therefore the stability in driuing along goaf tunnel is carried out quantitative assessment, guide field is constructed, optimize roadway support parameter.
There is following problems in prior art:
One, the stability in driuing along goaf tunnel and the scope of breaking of country rock cannot comprehensive quantitative evaluation.
Two, also there are not the dynamic monitoring of driuing along goaf tunnel and Stability Assessment method at present.
Three, in Practical Project, driuing along goaf tunnel is subject to the combined effect of the back production stress of crustal stress, tectonic stress and upper work surface, under complex stress condition, the destructive characteristics of country rock directly affects roadway deformation, and driuing along goaf tunnel dynamic monitoring both at home and abroad at present is rarely seen with Stability Assessment technique study.
Summary of the invention
In consideration of it, for solving the problems referred to above, the present invention provides a kind of driuing along goaf tunnel dynamic monitoring based on micro seismic monitoring and Stability Assessment method, by high accuracy Microseismic monitoring system, accurately judge the stability in driuing along goaf tunnel.
For achieving the above object, the present invention adopts the following technical scheme that.
One, based on the tunnel dynamic monitoring of micro seismic monitoring driuing along goaf and Stability Assessment method, comprises the following steps:
Step 1, installs high accuracy micro seismic monitoring instrument system in driuing along goaf tunnel;
Step 2, adopt high accuracy Microseismic monitoring system that driuing along goaf tunnel is monitored in real time, gather country rock to break the position of microseismic event, energy and number of times, computational entity coal side and along the internal accumulative microseismic event number of times of the accumulative microseismic event energy value in empty side, unit volume microseismic event energy density and unit volume rock mass;
Step 3, in driuing along goaf tunnel, lays some drift section convergence monitoring stations, gathers tunnel entity coal side and the section convergence numerical value along empty side, according to the accumulative convergency value of section, calculates tunnel entity coal side and the convergence in mean value along empty side section;
Step 4, in driuing along goaf tunnel, is selecting a certain amount of anchor pole or anchor cable to carry out pull-out test, the average pulling capacity of statistics anchor pole or anchor cable along empty side and entity coal side respectively;
Step 5, driuing along goaf Drift stability is analyzed: adds up microseismic event energy value, unit volume microseismic event energy density based on entity coal side with along empty side, adds up microseismic event number of times, anchor pole or the average pulling capacity of anchor cable and the average convergency value of section, calculate accumulative microseismic event energy increment rate, unit volume microseismic event energy density increment rate, accumulative microseismic event number of times increment rate, anchor pole or anchor cable average pulling capacity reduction rate and the average amount of convergence increment rate of section respectively;
Step 6, driuing along goaf tunnel comprehensive quantitative evaluation: each evaluation of estimate obtained based on step 5, exploitation right weight analysis method, set up driuing along goaf tunnel comprehensive quantitative evaluation index, driuing along goaf Drift stability is carried out quantitative assessment.
Further, in step 1, described high accuracy micro seismic monitoring instrument system includes sensor, data acquisition substation, system is analyzed in microseismic system main frame and ground data integrated treatment, described sensor is arranged on the empty side stringcourse in edge and entity coal shoulder portion and the layout that moves forward successively along with driving face, the distance that adjacent sensors interval sets, country rock breaks generation signal, each sensor is transformed into analog electrical signal after receiving microseismic signals, by data acquisition substation, the signal of telecommunication of collection is connected with colliery Network Outstation Used by optical fiber, microseismic system main frame is transmitted a signal to by colliery network, and ground data integrated treatment is analyzed system and the signal of telecommunication is changed into digital signal, and to digital signal processed, to realize the location to microseismic event, the acquisition of event argument.
Further, in step 2, the break confirmation method of the position of microseism, energy and number of times of country rock is as follows:
Breaking of roadway surrounding rock can along with the generation of elastic wave or stress wave, it is translated into the signal of telecommunication after sensor acquisition microseismic signals, the signal of telecommunication is changed into digital signal by microseism software again, analyze system by ground data integrated treatment microseismic signals to be processed and analyzes, confirm that country rock breaks the position of microseismic event, energy and number of times.
Tunnel is B and B ' along the accumulative microseismic event energy value in empty side and entity coal side, and its value is B=�� B respectivelyiWith B'=�� B'i; BiRepresent empty side, edge, tunnel microseismic event energy value; B'iRepresent tunnel entity coal side microseismic event energy value;
Further, in step 2, described tunnel is along empty side and entity coal side unit volume microseismic event energy density �� and �� ', and its value is ��=P/V and �� '=P '/V ', wherein P and P ' breaks microseismic event energy value in scope for country rock, the volume that V and V ' breaks in scope for country rock.
Described tunnel is M and M ' along the accumulative microseismic event number of times in empty side and entity coal side, and its value is M=�� M respectivelyiWith M'=�� M'i; MiRepresent empty side, edge, tunnel single microseismic event number of times, M'iPresentation-entity coal side single microseismic event number of times;
Further, in step 3, described is L and L ' along empty side and the average convergency value of entity coal side section, and its value is L=�� L respectivelyi/ W and L'=�� L'i/ W, wherein W is dynamometry section convergency value number of times, LiRepresent the single convergency value along empty side section, L'iThe single convergency value of presentation-entity coal side section;
Further, in step 4, empty side, described edge and entity coal side anchor pole or anchor cable pulling capacity meansigma methods are N and N ', its value respectively N=��Ni/ Z and N'=�� N'i/ Z, wherein Z is pull-out test number of times; NiFor the empty side single wire drawing anchor pole in edge or anchor cable pulling capacity; N'iFor entity coal side single wire drawing anchor pole or anchor cable pulling capacity;
Further, in step 5, described accumulative microseismic event energy increment rate is R1=(B-B')/B, unit volume microseismic event energy density increment rate is R2=(��-�� ')/��, accumulative microseismic event number of times increment rate is R3The average pulling capacity reduction rate of=(M-M')/M, anchor pole or anchor cable is R4=(N'-N)/N' and the average amount of convergence increment rate R of section5=(L-L')/L.
Further, in step 6, described driuing along goaf Drift stability quantitative assessing index, obtained by weight analysis method, i.e. R=�� HkRk, wherein, HkFor weight coefficient, k=1,2,3,4,5, its size should according to R1��R5Size and reliability and the accuracy of test data be allocated, meet �� Hk=1.
Beneficial effects of the present invention is as follows:
The present invention utilizes high accuracy Microseismic monitoring system, driuing along goaf Drift stability is carried out dynamic monitoring, to along empty side and entity coal side anchor rod drawing power and the multiple index comprehensive relative analysis of section convergence in mean, avoid the false judgment caused because of single index, ensure the accuracy that Drift stability judges, it is thus possible to comprehensively, judge stability of the roadway state accurately, and then instruct the supporting scheme design in driuing along goaf tunnel and implement.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the driuing along goaf Drift stability method for quantitatively evaluating flow chart of the present invention;
Fig. 2 is the gob side entry driving Microseismic monitoring system schematic diagram of the present invention;
Fig. 3 is that the tunnel of the present invention is along empty side and entity coal side anchor pole or anchor cable pulling capacity schematic diagram;
Wherein, 1 is portion of digging laneway left side 1 sensor, and 2 is portion of digging laneway left side 2 sensor, 3 is portion of digging laneway left side 3 sensor, 4 is digging laneway No. 4 sensors of right shoulder, and 5 is digging laneway No. 5 sensors of right shoulder, and 6 is digging laneway No. 6 sensors of right shoulder.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail:
The present invention is based on high accuracy Microseismic monitoring system, analysis obtains microseismic event energy increment rate, unit volume microseismic event energy density increment rate, accumulative microseismic event number of times increment rate, anchor pole or the parameter such as anchor cable average pulling capacity reduction rate and the average amount of convergence increment rate of section, and by weight analysis method, driuing along goaf Drift stability comprehensive and quantitative is analyzed, set up driuing along goaf Drift stability effect quantitatively evaluation index, driuing along goaf Drift stability can be carried out scientific and reasonable evaluation.
For realizing object above, the present invention adopts the following technical scheme that
The first step: the installation of micro seismic monitoring instrument system
High accuracy Microseismic monitoring system is by sensor, data acquisition substation, system composition is analyzed in microseismic system main frame and ground data integrated treatment, country rock breaks generation signal, sensor is transformed into analog electrical signal after receiving microseismic signals, by data acquisition substation, the signal of telecommunication of collection is connected with colliery Network Outstation Used by optical fiber, microseismic system main frame is transmitted a signal to by colliery network, and ground data integrated treatment is analyzed system and the signal of telecommunication is changed into digital signal, and to digital signal processed, to realize the location to microseismic event, the acquisition of event argument, concrete installation method is as follows:
According to the geological conditions in driuing along goaf tunnel, cross dimensions, roadway surrounding rock monitoring scheme, it is determined that high accuracy Microseismic monitoring system arrangement parameter, such as Fig. 1,6 sensors of roadway layout, empty side, edge and entity coal side respectively arrange 3, are respectively as follows:
Portion of digging laneway left side 1 sensor 1, portion of digging laneway left side 2 sensor 2, portion of digging laneway left side 3 sensor 3, digging laneway No. 4 sensors 4 of right shoulder, digging laneway No. 5 sensors 5 of right shoulder, digging laneway No. 6 sensors 6 of right shoulder; Each sensor distance certain distance, sensor moves forward successively along with driving face layout.
Data acquisition substation is arranged in monitoring tunnel; Each sensor is connected with data acquisition substation by optical cable, by sensor acquisition to country rock destruction signals pass in data acquisition substation, then pass through optical fiber to be connected with colliery Network Outstation Used, the country rock destruction signals collected is sent to ground microseismic system main frame by colliery network.
Second step: data acquisition in gob side entry excavation work
Driuing along goaf tunnel is monitored by A, employing high accuracy Microseismic monitoring system in real time, gathers the microseism energy value P along empty side and entity coal side respectivelyi��P'iWith microseismic event number of times Mi��Mi'��
B, by drift section convergence monitoring station, monitoring is along empty side and entity coal side section convergency value LiAnd Li'��
C, choose certain anchor pole or anchor cable in driuing along goaf lane along empty side and entity coal side, carry out anchor pole or anchor cable pull-out test, obtain the anchor pole along empty side and entity coal side or anchor cable pulling capacity NiAnd Ni'��
3rd step: data process
D, according to the obtained data of second step, calculating tunnel along the accumulative microseismic event energy value in empty side and entity coal side is B and B ', and its value is B=�� B respectivelyiWith B'=�� B'i��
E, according to the obtained data of second step, calculate empty side, edge, tunnel and entity coal side unit volume microseismic event energy density �� and �� ', its value is ��=P/V and �� '=P '/V, and wherein P and P ' breaks microseismic event energy value in scope for country rock, and V is the volume that country rock breaks in scope;
Wherein country rock breaks the volume V=L �� B �� H in scope, wherein L is that country rock breaks scope, and B is that country rock breaks width, i.e. distance between farthest two breakdown points in tunnel, H is country rock rupture height before mining influence, i.e. distance between tunnel highest point and lowest point country rock breakdown point.
The destruction signals of 6 the sensor acquisition country rocks arranged, by data handling system, destruction signals is processed and analysis, realize the location of country rock Surface Rupture Events, determine the rupture event of country rock, distance between the breakdown point of farthest, two ends in roadway surrounding rock, before namely determining mining influence, country rock breaks range L;
F, according to the obtained data of second step, calculating tunnel along the accumulative microseismic event number of times in empty side and entity coal side is M and M ', and its value is M=�� M respectivelyiWith M'=�� M'i��
G, according to the obtained data of second step, calculating tunnel along empty side and the average convergency value of entity coal side section is L and L ', and its value is L=�� L respectivelyi/ W and L'=�� L'i/ W, wherein W is dynamometry section convergency value number of times.
H, according to the obtained data of second step, calculating tunnel along empty side and entity coal side anchor pole or the average pulling capacity of anchor cable is N and N ', and its value is N=�� N respectivelyi/ Z and N'=�� N'i/ Z, wherein Z is pull-out test number of times.
4th step: stability analysis
According to the data that the 3rd step obtains, can try to achieve accumulative microseismic event energy increment rate is R1=(B-B')/B, unit volume microseismic event energy density increment rate is R2=(��-�� ')/��, accumulative microseismic event number of times increment rate is
R3The average pulling capacity reduction rate of=(M-M')/M, anchor pole or anchor cable is R4=(N'-N)/N' and the average amount of convergence increment rate R of section5=(L-L')/L.
5th step: quantitative assessment
According to the 4th step finishing analysis to data, exploitation right weight analysis method, set up driuing along goaf tunnel quantitative assessing index and R=�� HkRk, wherein, HkFor weight coefficient, k=1,2,3,4,5, its size should according to R1��R5Size and reliability and the accuracy of test data be allocated, meet �� Hk=1.
As known by the technical knowledge, the present invention can be realized by other the embodiment without departing from its essence or essential feature, therefore, for each side, is all merely illustrative, is not only. All within the scope of the present invention or be all included in the invention in the change being equal in the scope of the present invention.

Claims (10)

1. one kind based on the tunnel dynamic monitoring of micro seismic monitoring driuing along goaf and Stability Assessment method, it is characterised in that comprise the following steps:
Step 1, installs high accuracy micro seismic monitoring instrument system in driuing along goaf tunnel;
Step 2, adopt high accuracy Microseismic monitoring system that driuing along goaf tunnel is monitored in real time, gather country rock to break the position of microseismic event, energy and number of times, computational entity coal side and along the internal accumulative microseismic event number of times of the accumulative microseismic event energy value in empty side, unit volume microseismic event energy density and unit volume rock mass;
Step 3, in driuing along goaf tunnel, lays some drift section convergence monitoring stations, gathers tunnel entity coal side and the section convergence numerical value along empty side, according to the accumulative convergency value of section, calculates tunnel entity coal side and the convergence in mean value along empty side section;
Step 4, in driuing along goaf tunnel, is selecting a certain amount of anchor pole or anchor cable to carry out pull-out test, the average pulling capacity of statistics anchor pole or anchor cable along empty side and entity coal side respectively;
Step 5, driuing along goaf Drift stability is analyzed: calculate accumulative microseismic event energy increment rate, unit volume microseismic event energy density increment rate, accumulative microseismic event number of times increment rate, anchor pole or anchor cable average pulling capacity reduction rate and the average amount of convergence increment rate of section;
Step 6, driuing along goaf tunnel comprehensive quantitative evaluation: each evaluation of estimate obtained based on step 5, exploitation right weight analysis method, set up driuing along goaf tunnel comprehensive quantitative evaluation index, driuing along goaf Drift stability is carried out quantitative assessment.
2. as claimed in claim 1 based on the tunnel dynamic monitoring of micro seismic monitoring driuing along goaf and Stability Assessment method, it is characterized in that, in step 1, described high accuracy micro seismic monitoring instrument system includes sensor, data acquisition substation, system is analyzed in microseismic system main frame and ground data integrated treatment, each sensor receives microseismic signals, by data acquisition substation, the signal of telecommunication of collection is connected with colliery Network Outstation Used by optical fiber, microseismic system main frame is transmitted a signal to by colliery network, and ground data integrated treatment is analyzed system and the signal of telecommunication is changed into digital signal, and to digital signal processed, to realize the location to microseismic event, the acquisition of event argument.
3. as claimed in claim 1 based on the tunnel dynamic monitoring of micro seismic monitoring driuing along goaf and Stability Assessment method, it is characterised in that in step 2, the break confirmation method of the position of microseism, energy and number of times of country rock is as follows:
Breaking of roadway surrounding rock can along with the generation of elastic wave or stress wave, it is translated into the signal of telecommunication after sensor acquisition microseismic signals, the signal of telecommunication is changed into digital signal by microseism software again, analyze system by ground data integrated treatment microseismic signals to be processed and analyzes, confirm that country rock breaks the position of microseismic event, energy and number of times.
4. as claimed in claim 1 based on the tunnel dynamic monitoring of micro seismic monitoring driuing along goaf and Stability Assessment method, it is characterised in that
Tunnel is B and B ' along the accumulative microseismic event energy value in empty side and entity coal side, and its value is B=�� B respectivelyiWith B'=�� B'i; BiRepresent empty side, edge, tunnel microseismic event energy value; B'iRepresent tunnel entity coal side microseismic event energy value.
5. as claimed in claim 1 based on the tunnel dynamic monitoring of micro seismic monitoring driuing along goaf and Stability Assessment method, it is characterized in that, in step 2, empty side, edge, described tunnel and entity coal side unit volume microseismic event energy density �� and �� ', its value is ��=P/V and �� '=P '/V ', wherein P and P ' breaks microseismic event energy value in scope for country rock, the volume that V and V ' breaks in scope for country rock.
6. as claimed in claim 1 based on the tunnel dynamic monitoring of micro seismic monitoring driuing along goaf and Stability Assessment method, it is characterised in that
Described tunnel is M and M ' along the accumulative microseismic event number of times in empty side and entity coal side, and its value is M=�� M respectivelyiWith M'=�� M'i; MiRepresent empty side, edge, tunnel single microseismic event number of times, M'iPresentation-entity coal side single microseismic event number of times.
7., as claimed in claim 1 based on the tunnel dynamic monitoring of micro seismic monitoring driuing along goaf and Stability Assessment method, it is characterised in that in step 3, described is L and L ' along empty side and the average convergency value of entity coal side section, and its value is L=�� L respectivelyi/ W and L'=�� L'i/ W, wherein W is dynamometry section convergency value number of times, LiRepresent the single convergency value along empty side section, L'iThe single convergency value of presentation-entity coal side section.
8., as claimed in claim 1 based on the tunnel dynamic monitoring of micro seismic monitoring driuing along goaf and Stability Assessment method, it is characterised in that in step 4, empty side, described edge and entity coal side anchor pole or anchor cable pulling capacity meansigma methods are N and N ', and its value is N=�� N respectivelyi/ Z and N'=�� N'i/ Z, wherein Z is pull-out test number of times; NiFor the empty side single wire drawing anchor pole in edge or anchor cable pulling capacity; N'iFor entity coal side single wire drawing anchor pole or anchor cable pulling capacity.
9. as claimed in claim 1 based on the tunnel dynamic monitoring of micro seismic monitoring driuing along goaf and Stability Assessment method, it is characterised in that in step 5, described accumulative microseismic event energy increment rate is R1=(B-B')/B, unit volume microseismic event energy density increment rate is R2=(��-�� ')/��, accumulative microseismic event number of times increment rate is R3The average pulling capacity reduction rate of=(M-M')/M, anchor pole or anchor cable is R4=(N'-N)/N' and the average amount of convergence increment rate R of section5=(L-L')/L.
10. as claimed in claim 9 based on the tunnel dynamic monitoring of micro seismic monitoring driuing along goaf and Stability Assessment method, it is characterised in that in step 6, described driuing along goaf Drift stability quantitative assessing index, obtained by weight analysis method, i.e. R=�� HkRk, wherein, HkFor weight coefficient, k=1,2,3,4,5; Its size should according to R1��R5Size and reliability and the accuracy of test data be allocated, meet �� Hk=1.
CN201610079154.3A 2016-02-04 2016-02-04 A kind of driuing along goaf tunnel dynamic monitoring based on micro seismic monitoring and Stability Assessment method CN105626150B (en)

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