CN111913216A - Roadway surrounding rock stability force structure cooperative monitoring method influenced by repeated mining - Google Patents
Roadway surrounding rock stability force structure cooperative monitoring method influenced by repeated mining Download PDFInfo
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Abstract
The invention provides a force-structure cooperative monitoring method for stability of surrounding rock of a roadway influenced by repeated mining, and relates to the technical field of coal mine safety. The method for cooperatively monitoring the stability and the force structure of the roadway surrounding rock influenced by repeated mining comprises the following steps: step one, acquiring point source information of surrounding rock structure damage and stress distribution; step two, acquiring 'region' source information of stress distribution of surrounding rock; and step three, comprehensively monitoring the stability of the surrounding rock of the roadway influenced by secondary mining. The invention aims at that the surrounding rock of the roadway is affected by two mining disturbances successively, realizes the force-structure cooperation monitoring in two aspects of stress distribution and structural damage around the surrounding rock of the roadway, develops a point-area combined monitoring scheme, systematically and accurately monitors the stability of the surrounding rock of the roadway affected by repeated mining, and has important theoretical significance and guiding significance for making a deformation control scheme of the surrounding rock of the roadway affected by repeated mining.
Description
Technical Field
The invention relates to the technical field of coal mine safety, in particular to a method for cooperatively monitoring stability and strength of surrounding rock of a roadway influenced by repeated mining.
Background
In order to improve the coal mining speed, shorten the preparation time of a stope face and relieve the problems of tension of mining continuation in a mining area and the like, most modern mine stope faces in China adopt double-lane arrangement, wide-section coal pillars of 20-45 m are reserved between adjacent working faces, a reserved roadway and the section coal pillars are subjected to mining disturbance influence of the two working faces successively, the damage degree and stress distribution of a surrounding rock structure of the roadway are complex, the roadway is large in deformation and difficult to support, and dynamic pressure of the roadway shows accidents frequently. Therefore, the structural damage condition of the surrounding rock of the roadway under the influence of primary mining and secondary mining is researched, the stress distribution characteristics of the surrounding rock of the roadway under the influence of near field mining and far field mining twice are clarified, and the stability of the surrounding rock of the roadway under the influence of repeated mining is monitored. The method has important theoretical significance and guiding significance for formulating the deformation control scheme of the roadway enclosure influenced by repeated mining.
Disclosure of Invention
The invention aims to provide a force structure cooperative monitoring method for roadway surrounding rock stability influenced by repeated mining, and the method can be used for realizing systematic and accurate monitoring of roadway stability influenced by repeated mining.
In order to achieve the above purpose, the technical solution adopted by the invention is as follows:
a force structure cooperative monitoring method for stability of roadway surrounding rock influenced by repeated mining comprises the following steps:
step one, acquiring point source information of surrounding rock structure damage and stress distribution
Step 11, obtaining stress peak position P of surrounding rock1And stress range S1
The primary mining influence roadway is a main transport crossheading and an auxiliary transport crossheading, a plurality of stress monitoring stations are arranged in a connecting roadway between the main transport crossheading and the auxiliary transport crossheading at intervals, the stress monitoring stations monitor the stress values of coal pillars in sections between the main transport crossheading and the auxiliary transport crossheading, and the stress values monitored by the stress monitoring stations are obtained in the stoping process of a working face;
the distance from the auxiliary transportation crossheading far away from one end of the working surface to the first stress value peak point is the stress peak position P1The distance from the auxiliary transportation crossheading far away from one end of the working face to the first stress value valley point behind the first stress value peak point is a stress range S1；
Step 12, obtaining the range L of the loose circle of the surrounding rock
The secondary mining influence roadway is a return air gateway, and a range L of a surrounding rock loosening zone of the return air gateway is obtained;
step 13, obtaining the maximum value D of the moving approach quantity of the top and bottom plates of the surrounding rock
Setting a moving-near amount monitoring station on a top plate and a bottom plate at set positions of a return air gateway, monitoring the moving-near amount of the top plate and the bottom plate by the moving-near amount monitoring station, and acquiring the maximum value D of the moving-near amount of the top plate and the bottom plate in the stoping process of a working face;
step two, acquiring 'region' source information of surrounding rock stress distribution
Detecting the stress distribution of the coal pillars between the main transportation crossheading and the auxiliary transportation crossheading in front of the working face by adopting a micro-seismic system, determining the position of a stress value peak point of the coal pillars at the front section of the working face, and determining a stress aggregation influence area of the coal pillars at the front section of the working face;
the distance from the working surface to the stress value peak point is the stress peak position P2Self-madeThe distance from the working surface to the boundary of the stress concentration influence area is a stress range S2；
Step three, comprehensively monitoring the influence of secondary mining on the stability of surrounding rocks of the roadway
Step 31, determining a monitoring index
Stress peak position P is taken as P1And P2Maximum in (1), stress range S is taken as S1And S2Maximum value of (1);
determination of the monitoring index Z from the stress peak position P1The numerical value of (A):
when P is less than 2.5, Z1Is a non-volatile organic compound (I) with a value of 0,
when P is more than or equal to 2.5 and less than or equal to 4.5, Z1The number of the carbon atoms is 1,
when P is more than 4.5 and less than 8, Z1Is 2;
determination of the monitoring index Z from the stress range S2The numerical value of (A):
when S is less than 5, Z2Is a non-volatile organic compound (I) with a value of 0,
when S is more than or equal to 5 and less than or equal to 10, Z2The number of the carbon atoms is 1,
when S is more than 10 and less than 15, Z2Is 2;
determining a monitoring index Z from the maximum value D of the moving amount of the top plate and the bottom plate3The numerical value of (A):
when D < 10, Z3Is a non-volatile organic compound (I) with a value of 0,
when D is more than or equal to 10 and less than or equal to 20, Z3The number of the carbon atoms is 1,
when 20 < D, Z3Is 2;
determination of the monitoring index Z from the extent L of the loosening coil4The numerical value of (A):
when L < 120, Z4Is a non-volatile organic compound (I) with a value of 0,
when L is more than or equal to 120 and less than or equal to 250, Z4The number of the carbon atoms is 1,
when 250 < L, Z4Is 2;
step 32, integrated monitoring
Index of integrated monitoring
When Z is less than or equal to 0.33, the surrounding rock is stable;
when Z is more than 0.33 and less than or equal to 0.66, the surrounding rock is moderately stable;
when Z is more than 0.66, the surrounding rock is unstable.
Preferably, in step 12, the process of obtaining the range L of the loosening circle of the surrounding rock of the return air gateway is as follows:
drilling holes in a top plate and a side part of the return air crossheading, pushing a camera of a drilling peeping instrument inwards along the holes, observing the development degree of rock cracks in the holes, wherein dense cracks in the shallow parts in the holes obviously develop, surrounding rocks are crushed into crack development sections, no obvious cracks exist in the deep parts in the holes, and rock bodies are complete into rock complete sections;
and (3) regarding the junction of the fracture development section and the complete rock section as a surrounding rock loosening ring boundary, wherein the distance from the surrounding rock loosening ring boundary to the orifice is a loosening ring range L.
Preferably, in the second step, a PASAT-M type portable microseismic system is adopted to detect the stress distribution of the coal pillars in the section between the main transportation along groove and the auxiliary transportation along groove in front of the working face, and the specific process is as follows:
arranging blastholes at set intervals in the auxiliary transportation crossheading;
arranging a receiving end at the position of the main transportation crossheading corresponding to the blast hole;
filling explosives in the blasthole, detonating at fixed time, and recording the arrival time of the shock wave at the receiving end;
the PASAT-M type portable microseismic system is characterized in that the stress intensity of a coal pillar in a front section of a working surface is represented according to the wave speed change of a vibration wave, a stress intensity distribution diagram of the coal pillar in the front section of the working surface is obtained, and the stress value peak point position of the coal pillar in the front section of the working surface and a stress aggregation influence area of the coal pillar in the front section of the working surface are determined according to the stress intensity distribution diagram.
The beneficial technical effects of the invention are as follows:
the force structure cooperative monitoring method for the stability of the surrounding rock of the roadway influenced by the repeated mining realizes the force structure cooperative monitoring aiming at the influence of the mining disturbance of the surrounding rock of the roadway for two times, the stress distribution and the structural damage around the periphery of the surrounding rock of the roadway, and a point-area combined monitoring scheme is developed, so that the stability of the surrounding rock of the roadway influenced by the repeated mining is systematically and accurately monitored, and the important theoretical significance and the guiding significance are provided for the formulation of the deformation control scheme of the surrounding rock of the roadway influenced by the repeated mining.
Drawings
FIG. 1 is a flow chart of a force structure cooperative monitoring method for roadway surrounding rock stability influenced by repeated mining according to an embodiment of the invention;
FIG. 2 is a diagram of a dual lane arrangement according to an embodiment of the present invention;
FIG. 3 is a graph of stress monitoring curves for a coal pillar in accordance with an embodiment of the present invention;
FIG. 4 is a shot of a fracture development section obtained by surrounding rock loosening ring drilling peeking in the embodiment of the invention;
FIG. 5 is a shot of a complete section of rock obtained by surrounding rock loose ring drilling peeking in the embodiment of the invention;
FIG. 6 is a graph of top and bottom plate proximity change in accordance with an embodiment of the present invention;
FIG. 7 is a diagram of a detection arrangement for a PASAT-M type portable microseismic system in accordance with an embodiment of the present invention;
FIG. 8 is a graph showing the stress intensity distribution of the coal pillar in the front section of the working face according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings in combination with the specific embodiments. Certain embodiments of the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Indeed, various embodiments of the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.
In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "front", "rear", and the like refer to the orientation or positional relationship shown in the drawings, which is only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In this embodiment, please refer to fig. 1 to 8 for a collaborative monitoring method for the stability of surrounding rock in a roadway affected by repeated mining.
A force structure cooperative monitoring method for stability of roadway surrounding rock influenced by repeated mining comprises the following steps:
step one, acquiring point source information of surrounding rock structure damage and stress distribution
Step 11, obtaining stress peak position P of surrounding rock1And stress range S1
The method comprises the following steps that a primary mining influence roadway is a main transport crossheading and an auxiliary transport crossheading, a plurality of stress monitoring stations are arranged in a connecting roadway between the main transport crossheading and the auxiliary transport crossheading at intervals of a set distance, the stress monitoring stations monitor stress values of coal pillars in sections between the main transport crossheading and the auxiliary transport crossheading, and in the stoping process of a working face, the stress values monitored by the stress monitoring stations are obtained to obtain a section coal pillar stress monitoring curve, wherein the section coal pillar stress monitoring curve is shown in fig. 3;
the distance from the auxiliary transportation crossheading far away from one end of the working surface to the first stress value peak point is the stress peak position P1The distance from the auxiliary transportation crossheading far away from one end of the working face to the first stress value valley point behind the first stress value peak point is a stress range S1；
Step 12, obtaining the range L of the loose circle of the surrounding rock
The secondary mining influence roadway is a return air gateway, and a range L of a surrounding rock loosening zone of the return air gateway is obtained;
specifically, the process of obtaining the return air crossheading surrounding rock loosening ring range L is as follows:
drilling holes in a top plate and a side part of the return air crossheading, slowly pushing a camera of a drilling peeping instrument inwards along the holes, observing the development degree of rock cracks in the holes, wherein dense cracks in the shallow parts in the holes obviously develop and surrounding rocks are broken into crack development sections, as shown in fig. 4, no obvious cracks exist in the deep parts in the holes, and rock mass is complete and is a complete rock section, as shown in fig. 5;
and (3) regarding the junction of the fracture development section and the complete rock section as a surrounding rock loosening ring boundary, wherein the distance from the surrounding rock loosening ring boundary to the orifice is a loosening ring range L.
Step 13, obtaining the maximum value D of the moving approach quantity of the top and bottom plates of the surrounding rock
Setting moving-near amount monitoring stations on a top plate and a bottom plate at set positions of a return air gateway, monitoring moving-near amount of a top plate and a bottom plate by the moving-near amount monitoring stations, wherein in the working face extraction process, the moving-near amounts of the top plate and the bottom plate monitored by the moving-near amount monitoring stations at different positions form a top plate and bottom plate moving-near amount change curve, as shown in fig. 6, the maximum value D of the moving-near amount of the top plate and the bottom plate is obtained, and the corresponding D in fig. 6 is 23 cm;
step two, acquiring 'region' source information of surrounding rock stress distribution
Detecting the stress distribution of the coal pillars between the main transportation crossheading and the auxiliary transportation crossheading in front of the working face by adopting a micro-seismic system, determining the position of a stress value peak point of the coal pillars at the front section of the working face, and determining a stress aggregation influence area of the coal pillars at the front section of the working face;
specifically, a PASAT-M type portable microseismic system is adopted to detect the stress distribution of the section coal pillars between a main transportation crossheading and an auxiliary transportation crossheading in front of a working face, and the specific process is as follows:
as shown in fig. 7, blastholes are arranged at positions with a set interval of 5m in the auxiliary transportation crossheading, and the depth of the blasthole is 2 m;
arranging a receiving end at the position of the main transportation crossheading corresponding to the blast hole;
filling 100g of explosive into a blast hole, initiating at fixed time, and recording the arrival time of the shock wave at a receiving end;
the PASAT-M type portable microseismic system characterizes the stress intensity of the coal pillars in the front section of the working face according to the wave velocity change of the vibration waves by a system self-contained algorithm, and obtains a stress intensity distribution diagram of the coal pillars in the front section of the working face, as shown in FIG. 8. The stress intensity is characterized by different colors, wherein red is used for representing the highest stress intensity, and yellow is used for representing the second highest stress intensity; the stress intensity in the coal pillar in front of the working face is higher in fig. 8, and the corresponding colors are red and yellow (fig. 8 is a black-and-white image, which cannot be marked). Determining the stress value peak point position (red position) of the coal pillar in the front section of the working face according to the stress intensity distribution diagramStress concentration affected zones (red and yellow covered zones) of the coal pillar in the front section of the face. The distance from the working surface to the stress value peak point is the stress peak position P2The distance from the working surface to the boundary of the stress concentration influence region is the stress range S2。
Step three, comprehensively monitoring the influence of secondary mining on the stability of surrounding rocks of the roadway
Step 31, determining a monitoring index
Stress peak position P is taken as P1And P2Maximum in (1), stress range S is taken as S1And S2Maximum value of (1);
determination of the monitoring index Z from the stress peak position P1The numerical value of (A):
when P is less than 2.5, Z1Is a non-volatile organic compound (I) with a value of 0,
when P is more than or equal to 2.5 and less than or equal to 4.5, Z1The number of the carbon atoms is 1,
when P is more than 4.5 and less than 8, Z1Is 2;
determination of the monitoring index Z from the stress range S2The numerical value of (A):
when S is less than 5, Z2Is a non-volatile organic compound (I) with a value of 0,
when S is more than or equal to 5 and less than or equal to 10, Z2The number of the carbon atoms is 1,
when S is more than 10 and less than 15, Z2Is 2;
determining a monitoring index Z from the maximum value D of the moving amount of the top plate and the bottom plate3The numerical value of (A):
when D < 10, Z3Is a non-volatile organic compound (I) with a value of 0,
when D is more than or equal to 10 and less than or equal to 20, Z3The number of the carbon atoms is 1,
when 20 < D, Z3Is 2;
determination of the monitoring index Z from the extent L of the loosening coil4The numerical value of (A):
when L < 120, Z4Is a non-volatile organic compound (I) with a value of 0,
when L is more than or equal to 120 and less than or equal to 250, Z4The number of the carbon atoms is 1,
when 250 < L, Z4Is 2;
step 32, integrated monitoring
Index of integrated monitoring
When Z is less than or equal to 0.33, the surrounding rock is stable;
when Z is more than 0.33 and less than or equal to 0.66, the surrounding rock is moderately stable;
when Z is more than 0.66, the surrounding rock is unstable.
Up to this point, the present embodiment has been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should clearly understand that the dynamic structure cooperative monitoring method for roadway surrounding rock stability affected by repeated mining is provided. The invention aims at the two aspects of stress distribution and structural damage of the surrounding rock of the roadway after two mining disturbance influences, realizes the force-structure cooperation monitoring in two aspects of surrounding rock periphery of the roadway, develops a point-area combined monitoring scheme, systematically and accurately monitors the stability of the surrounding rock of the roadway influenced by repeated mining, and has important theoretical significance and guiding significance for making a deformation control scheme of the surrounding rock of the roadway influenced by repeated mining.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A force structure cooperative monitoring method for stability of roadway surrounding rock influenced by repeated mining is characterized by comprising the following steps:
step one, acquiring point source information of surrounding rock structure damage and stress distribution
Step 11, obtaining stress peak position P of surrounding rock1And stress range S1
The method comprises the following steps that a primary mining influence roadway is a main transport crossheading and an auxiliary transport crossheading, a plurality of stress monitoring stations are arranged in a connection roadway between the main transport crossheading and the auxiliary transport crossheading at intervals, the stress monitoring stations monitor stress values of coal pillars in sections between the main transport crossheading and the auxiliary transport crossheading, and the stress values monitored by the stress monitoring stations are obtained in the stoping process of a working face;
the distance from the auxiliary transportation crossheading far away from one end of the working surface to the first stress value peak point is the stress peak position P1The distance from the auxiliary transportation crossheading far away from one end of the working face to the first stress value valley point behind the first stress value peak point is a stress range S1；
Step 12, obtaining the range L of the loose circle of the surrounding rock
The secondary mining influence roadway is a return air gateway, and a range L of a surrounding rock loosening zone of the return air gateway is obtained;
step 13, obtaining the maximum value D of the moving approach quantity of the top and bottom plates of the surrounding rock
Setting a moving-near amount monitoring station on a top plate and a bottom plate at set positions of a return air gateway, monitoring the moving-near amount of the top plate and the bottom plate by the moving-near amount monitoring station, and acquiring the maximum value D of the moving-near amount of the top plate and the bottom plate in the stoping process of a working face;
step two, acquiring 'region' source information of surrounding rock stress distribution
Detecting the stress distribution of the coal pillars between the main transportation crossheading and the auxiliary transportation crossheading in front of the working face by adopting a microseismic system, determining the position of a stress value peak point of the coal pillars at the front section of the working face, and determining a stress aggregation influence area of the coal pillars at the front section of the working face;
the distance from the working surface to the stress value peak point is the stress peak position P2The distance from the working surface to the boundary of the stress concentration influence region is the stress range S2；
Step three, comprehensively monitoring the influence of secondary mining on the stability of surrounding rocks of the roadway
Step 31, determining a monitoring index
Stress peak position P is taken as P1And P2Maximum in (1), stress range S is taken as S1And S2Maximum value of (1);
determination of the monitoring index Z from the stress peak position P1The numerical value of (A):
when P is less than 2.5, Z1Is a non-volatile organic compound (I) with a value of 0,
when P is more than or equal to 2.5 and less than or equal to 4.5, Z1The number of the carbon atoms is 1,
when P is more than 4.5 and less than 8, Z1Is 2;
determination of the monitoring index Z from the stress range S2The numerical value of (A):
when S is less than 5, Z2Is a non-volatile organic compound (I) with a value of 0,
when S is more than or equal to 5 and less than or equal to 10, Z2The number of the carbon atoms is 1,
when S is more than 10 and less than 15, Z2Is 2;
determining a monitoring index Z from the maximum value D of the moving amount of the top plate and the bottom plate3The numerical value of (A):
when D < 10, Z3Is a non-volatile organic compound (I) with a value of 0,
when D is more than or equal to 10 and less than or equal to 20, Z3The number of the carbon atoms is 1,
when 20 < D, Z3Is 2;
determination of the monitoring index Z from the extent L of the loosening coil4The numerical value of (A):
when L < 120, Z4Is a non-volatile organic compound (I) with a value of 0,
when L is more than or equal to 120 and less than or equal to 250, Z4The number of the carbon atoms is 1,
when 250 < L, Z4Is 2;
step 32, integrated monitoring
Index of integrated monitoring
When Z is less than or equal to 0.33, the surrounding rock is stable;
when Z is more than 0.33 and less than or equal to 0.66, the surrounding rock is moderately stable;
when Z is more than 0.66, the surrounding rock is unstable.
2. The method for cooperatively monitoring the stability and the strength of the surrounding rock of the roadway influenced by the repeated mining according to claim 1, wherein in the step 12, the process of acquiring the loosening range L of the surrounding rock of the return air crossheading is as follows:
drilling holes in a top plate and a side part of the return air crossheading, pushing a camera of a drilling peeping instrument inwards along the holes, observing the development degree of rock cracks in the holes, wherein dense cracks in the shallow parts in the holes obviously develop, surrounding rocks are crushed into crack development sections, no obvious cracks exist in the deep parts in the holes, and rock bodies are complete into rock complete sections;
and (3) regarding the junction of the fracture development section and the complete rock section as a surrounding rock loosening ring boundary, wherein the distance from the surrounding rock loosening ring boundary to the orifice is a loosening ring range L.
3. The method for cooperatively monitoring the stability and the force structure of the surrounding rock of the roadway influenced by the repeated mining according to claim 1, wherein in the second step, a PASAT-M type portable microseismic system is adopted to detect the stress distribution of the coal pillars in the section between the main transportation crossheading and the auxiliary transportation crossheading in front of the working face, and the specific process is as follows:
arranging blastholes at set intervals in the auxiliary transportation crossheading;
arranging a receiving end at the position of the main transportation crossheading corresponding to the blast hole;
filling explosives in the blasthole, detonating at fixed time, and recording the arrival time of the shock wave at the receiving end;
the PASAT-M type portable microseismic system is characterized in that the stress intensity of a coal pillar in a front section of a working face is represented according to the wave speed change of a vibration wave, a stress intensity distribution diagram of the coal pillar in the front section of the working face is obtained, and the stress value peak point position of the coal pillar in the front section of the working face and a stress aggregation influence area of the coal pillar in the front section of the working face are determined according to the stress intensity distribution diagram.
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Cited By (2)
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| CN112924059A (en) * | 2021-01-26 | 2021-06-08 | 上海同岩土木工程科技股份有限公司 | Strip-type surrounding rock pressure monitoring device, monitoring method and installation method |
| CN113420611A (en) * | 2021-06-01 | 2021-09-21 | 煤炭科学研究总院 | Method and device for detecting safety state of surrounding rock of roadway and electronic equipment |
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| CN111913216B (en) | 2022-09-20 |
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