CN212406808U - Safety monitoring system for lateral coal body supporting pressure of coal mine goaf - Google Patents

Abstract

The utility model relates to a colliery safety inspection field discloses a colliery goaf side direction coal body supporting pressure safety monitoring system, including eight passageway stress collectors, the stress channel interface connection three-way valve of eight passageway stress collectors, and the top one end of three-way valve is through the oil feed steel pipe connection drilling stressometer, and drilling stressometer arranges in the drilling in the coal seam, and the other end that corresponds oil feed locking cone valve passes through the oil outlet rubber tube of manual oil pump and connects on the oil-out of manual oil pump; the eight-channel stress collector is connected with the optical transceiver and the intrinsic safety power supply through armored cables, and the drill hole is arranged in a coal body lateral supporting stress monitoring and measuring area which is 100m away from the working face cutting hole. The utility model discloses can rationally confirm narrow coal pillar and reserve the minimum width of establishing, improve the coal resource rate of recovery, strengthen tunnel stability, under the prerequisite of guaranteeing colliery safety in production, improve the economic benefits of colliery enterprise for safety in production and economic benefits have gained win-win.

Description

Safety monitoring system for lateral coal body supporting pressure of coal mine goaf

Technical Field

The utility model relates to a colliery safety inspection field, in particular to colliery goaf side direction coal body supporting pressure safety monitoring system.

Background

Along with the continuous mining of coal resources, the coal resources are less and less, and the damage and the deformation of an overlying rock stratum caused by the mining mode of managing a goaf roof by a traditional working face natural caving method cause the surface of the ground to be settled and damage ground buildings (structures), so that the ecological environment of the surface of the mining area is irreversibly damaged.

The working face goaf filling and stoping is a mining method for timely filling solid wastes such as coal gangue, fly ash and slag and the like near a coal mine into the goaf, the filling and stoping can control the damage and deformation of an overlying rock layer caused by mining, the surface deformation is always kept within the safe allowable range of a building (structure), the non-village-shifting coal mining under the building (structure) is realized, the coal resources are fully utilized, and the ecological environment of the mining area is protected.

After stoping of the working face of the upper section of the coal mine, the surrounding rock stress is redistributed due to caving of the roof rock stratum and movement of the overlying rock stratum, lateral supporting pressure is generated on two sides of the goaf, and a stress reduction area, a stress increase area and an original rock stress area are formed from the edge of the goaf to the deep part of the coal body. The narrow coal pillar gob-side entry driving is to arrange a roadway in a goaf edge stress reduction area, and is characterized in that the stress of surrounding rock of the roadway is small, but the strength and the bearing capacity of the narrow coal pillar are obviously reduced after the narrow coal pillar deforms after passing through a peak.

Although the bearing capacity of the narrow coal pillar can be improved due to the large size of the narrow coal pillar, the narrow coal pillar is reserved too much, so that more coal resources are lost, and the narrow coal pillar is difficult to be ensured to be out of the influence range of the bearing pressure zone; the narrow coal pillar has small size, and not only has poor stability and low bearing capacity, but also is difficult to maintain in a roadway.

At present, most coal mines in China still determine the width of a narrow coal pillar by means of experience, a scientific and targeted method is lacked, the waste of coal resources is caused by the fact that the width of the narrow coal pillar is too large, the maintenance of a roadway tunneling and mining process is often difficult to achieve due to the fact that the width of the narrow coal pillar is too small, and even roof caving accidents occur. In addition, the determination of the width of the narrow coal pillar also comprises a formula derivation method, the formula derivation method involves more coal rock parameters, various parameters are not easy to determine, and the calculation result is greatly different from the actual result. Therefore, how to improve the recovery rate of coal resources and enhance the stability of a roadway, determine the reasonable narrow coal pillar width, and have great significance in monitoring the lateral coal body supporting pressure of a goaf.

Disclosure of Invention

The utility model discloses a remedy prior art not enough, provide a colliery goaf side to coal body supporting pressure safety monitoring system.

The utility model discloses a realize through following technical scheme: the utility model provides a colliery goaf side direction coal body supporting pressure safety monitoring system which characterized in that: the stress channel interface of the eight-channel stress collector is connected with a three-way valve, one end of the top of the three-way valve is connected with a borehole stressometer through an oil inlet steel pipe, the borehole stressometer is arranged in a borehole in a coal seam, and the other end corresponding to an oil inlet locking cone valve is connected to an oil outlet of a manual oil pump through an oil outlet rubber pipe of the manual oil pump; the eight-channel stress collector is connected with the optical transceiver and the intrinsic safety power supply through armored cables, and the drill hole is arranged in a coal body lateral supporting stress monitoring and measuring area which is 100m away from the working face cutting hole.

Preferably, the number of the borehole stress meters, the boreholes and the three-way valves connected with the eight-channel stress collectors is 8 respectively, wherein each borehole is deepened by 3m gradually compared with the previous borehole.

Preferably, the drilling depth is respectively 2m, 5m, 8m, 11m, 14m, 17m, 20m and 23m, the aperture phi is 42mm, and the distance is 1-2 m.

Preferably, the eight-channel stress collector is arranged between a 17m drill hole and a 20m drill hole, and the optical transceiver and the intrinsic safety power supply are placed in a chamber in a working face gateway.

Preferably, the drilling stress meter comprises an oil bag, the oil bag is wrapped in a left inclusion body and a right inclusion body, a connecting rod is installed at the bottom of the right inclusion body, a steel ball is fixed at the top of the drilling stress meter through a bolt, and a binding wire is arranged at the joint of the oil bag and the oil inlet steel pipe.

Preferably, an oil inlet steel pipe is welded at the rear end of an oil bag of the borehole stressometer, and a KJ10 female joint is welded at the other end of the oil inlet steel pipe and is connected to a respective three-way valve through a U-shaped pin.

Preferably, the manual oil pump comprises an oil pump handle and an oil outlet locking hand wheel.

Compared with the prior art, the utility model discloses an useful part is:

(1) the utility model abandons the fussy calculation process, avoids the one-sidedness of human experience, and can visually determine the width of the narrow coal pillar;

(2) the utility model discloses can carry out real-time supervision and can utilize big data platform and software to coal body supporting stress to the goaf side to carry out the analysis along with the change law of mining and roof activity to the coal body stress state, provide the monitoring data foundation for the narrow coal pillar of working face district section stays the affirmation and the follow-up tunnel optimal design of establishing the width. The recovery rate of coal resources can be improved, the stability of a roadway is enhanced, the reliable guarantee of coal mine safety production is realized, and the method has important significance on coal mine safety production;

(3) the utility model discloses can rationally confirm narrow coal pillar and reserve the minimum width of establishing, improve the coal resource rate of recovery, strengthen tunnel stability, under the prerequisite of guaranteeing colliery safety in production, improve the economic benefits of colliery enterprise for safety in production and economic benefits have gained win-win.

Drawings

The present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a side coal support pressure monitoring graph;

FIG. 2 is a schematic view of a gob-side entry driving structure of a narrow coal pillar;

FIG. 3 is a schematic structural view of the lateral coal body supporting pressure safety monitoring system in the goaf of coal mine according to the present invention entering the initial state;

FIG. 4 is a schematic structural view of a state of the lateral coal body supporting pressure safety monitoring system entering the gob in the coal mine gob area of the present invention;

FIG. 5 is a schematic view of the arrangement of borehole stressometers in the monitoring and measuring area of the present invention;

FIG. 6 is a schematic view of the overall structure of the lateral coal body supporting pressure safety monitoring system of the utility model in the goaf;

FIG. 7 is an application diagram of the lateral coal body supporting pressure safety monitoring system in the goaf of the utility model;

fig. 8 is a schematic structural view of the eight-channel stress collector of the present invention;

fig. 9 is a schematic structural view of the drilling stress sensor of the present invention;

FIG. 10 is a side coal body supporting pressure monitoring curve diagram of the goaf embodiment of the present invention;

in the figure, 1, a borehole stressometer, 2, a borehole, 3, an oil inlet steel pipe, 4, a coal bed, 5, a coal wall, 6, a monitoring roadway, 7, an eight-channel stress collector, 7-1, a stress collector, 8, a three-way valve, 8-1, an oil inlet locking cone valve, 9, a manual oil pump oil outlet rubber pipe, 10, a manual oil pump, 10-1, an oil pump handle, 10-2, an oil outlet locking hand wheel, 11, a gob-side working face, 12, a gob-side roadway, 13, a narrow coal pillar, 14, a boundary coal pillar, 15, a goaf, 1-1, an oil bag, 1-2, a left inclusion, 1-3, a right inclusion, 1-4, a bolt, 1-5, a steel ball, 1-6, a connecting rod, 1-7 and a binding wire.

Detailed Description

For a better understanding of the present invention, the background section is described in conjunction with the accompanying drawings before the detailed description of the embodiments of the present invention is given.

As shown in figure 1, after stoping of the working face of the upper section of the coal mine, the roof strata collapse and the overburden strata move to cause the redistribution of surrounding rock stress, lateral coal body supporting pressure is generated on two sides of a goaf, a stress reduction area A, a stress increase area B and an original rock stress area C are formed from the edge of the goaf to the deep part of a coal body, and a narrow coal pillar is arranged in the goaf edge stress reduction area along the goaf in a roadway tunneling manner. As shown in fig. 2, although the large size of the narrow coal pillar can improve the bearing capacity of the coal pillar, the narrow coal pillar is left too large, which not only causes more coal resources to be lost, but also makes it difficult to ensure that the narrow coal pillar is outside the influence range of the supporting pressure zone; the size of the coal pillar is small, the stability of the narrow coal pillar is poor, the bearing capacity is low, and the roadway is difficult to maintain, so that the determination of the width of the narrow coal pillar is important.

As shown in fig. 3-8, a coal mine goaf side coal body supporting pressure safety monitoring system comprises an eight-channel stress collector 7, wherein a stress channel interface of the eight-channel stress collector 7 is connected with a three-way valve 8, one end of the top of the three-way valve 8 is connected with a drilling stress meter 1 through an oil inlet steel pipe 3, the oil inlet steel pipe 3 is a stainless steel oil pipe, the drilling stress meter 1 is arranged in a drill hole 2 in a coal seam 4, the other end corresponding to an oil inlet locking cone valve 8-1 is connected to an oil outlet of a manual oil pump 10 through a manual oil pump oil outlet rubber pipe 9, and the manual oil pump 10 comprises an oil pump handle 10-1 and an oil outlet locking hand wheel 10-2; the eight-channel stress collector 7 is connected with the optical transceiver and the intrinsic safety power supply through armored cables, the drill hole 2 is arranged in a coal body lateral supporting stress monitoring and measuring area which is arranged at a position 100m away from the working face notch, and the armored cables are 4-core armored cables. In the embodiment, 8 borehole stressmeters 1, boreholes 2 and three-way valves 8 connected with the eight-channel stress collector 7 are respectively provided, the serial numbers are I-VIII, the depth of a first group of the boreholes 2 is 2m, each borehole is deepened by 3m gradually, the depths of the boreholes 2 are respectively 2m, 5m, 8m, 11m, 14m, 17m, 20m and 23m in sequence, the aperture phi is 42mm, the distance is 1-2 m, the length of the oil inlet steel pipe 3 is determined according to the depth of the boreholes 2 and is L +2m, and L is the depth of the boreholes 2. The distance of the present embodiment is 2 m.

As shown in fig. 5, the eight-channel stress collector 7 is disposed between the 17m bore hole and the 20m bore hole, and the optical transceiver and the intrinsically safe power supply are disposed in an underground chamber in which the working surface is easy to store and take electricity, and are used for receiving monitoring data transmitted by the eight-channel stress collector and transmitting the monitoring data to the ground monitoring room in real time through the optical transceiver and the TCP/IP ethernet ring network by means of an armored cable.

As shown in fig. 8-9, the drilling stress gauge 1 comprises an oil bag 1-1, the oil bag 1-1 is wrapped in a left inclusion 1-2 and a right inclusion 1-3, the left inclusion 1-2 and the right inclusion 1-3 are made of cast iron, and the drilling stress gauge is formed by casting, has moderate cost and is easy for large-scale production; the 1-1 oil bag is made of high-quality cold-rolled thin steel plate and is formed by rolling through a stamping die, and the plastic deformation capacity is good. The bottom of the right inclusion 1-3 is provided with a connecting rod 1-6, the top of the drilling stress meter 1 is fixed with steel balls 1-5 through bolts 1-4, an oil sealing port of the oil bag is sealed by the steel balls 1-5 and fastened by the bolts 1-4, and gas in the oil bag can be discharged quickly, so that the pressure measurement is more convenient, accurate and reliable. And a binding wire 1-7 is arranged at the joint of the oil bag 1-1 and the oil inlet steel pipe 3. The rear end of an oil bag 1-1 of the drilling stress meter 1 is welded with an oil inlet steel pipe 3, the other end of the oil inlet steel pipe 3 is welded with a KJ10 female joint which is connected with a respective three-way valve 8 through a U-shaped pin, and the KJ series joints are adopted for connection, so that the drilling stress meter can be quickly connected, and is convenient to disassemble and use. The borehole stressmeter 1 is arranged horizontally, and can monitor the vertical stress in the coal rock mass.

As shown in fig. 3-9, a method for using a coal mine goaf side coal body supporting pressure safety monitoring system comprises the following steps:

the method comprises the following steps: a monitoring scheme is formulated, according to specific geological conditions of a coal mine and design parameters of a working face, a coal body lateral supporting stress monitoring and measuring area is arranged at a position 100m away from a working face cutting hole, then 8 drill holes I-VIII are drilled on a coal wall 5 of a monitoring roadway 6 by a coal rock drill bit respectively, the drill holes I-VIII are selected according to design requirements, the depth of a drill hole 2 in the embodiment is respectively 2m, 5m, 8m, 11m, 14m, 17m, 20m and 23m, the aperture phi is 42mm, and the distance between the drill holes 2 is 1-2 m;

step two: welding an oil inlet steel pipe 3 at the rear end of an oil bag 1-1 of a borehole stress meter 1, connecting the other end of the oil inlet steel pipe 3 with respective three-way valves 8, connecting one end of each three-way valve 8 with a stress channel interface of an eight-channel borehole stress collector 7, connecting the other end of each three-way valve 8 corresponding to the oil inlet locking cone valve 8-1 to an oil outlet of a manual oil pump 10 through an oil outlet rubber pipe 9 of the manual oil pump, and sequentially sending each borehole stress meter 1 into a borehole 2 with required installation depth after connecting each part;

step three: sequentially pressing each drilling stress meter 1, wherein the initial stress is 5 MPa; pressing down and lifting up an oil pump handle 10-1 to enable an oil bag 1-1 of a drilling stress meter 1 to expand and jack up a left inclusion 1-2 and a right inclusion 1-3 to be in full contact and coupling with a coal seam 4, locking an oil inlet locking cone valve 8-1 corresponding to a three-way valve 8 after drilling one drilling stress meter 1, loosening an oil outlet locking hand wheel 10-2 of a manual oil pump 10, closing a pressure bearing system of the oil bag 1-1 at the moment, and reading drilling stress monitoring data on a nixie tube of a stress collector 7-1; then, disassembling the oil outlet rubber pipe 9 of the manual oil pump, connecting the oil outlet rubber pipe 9 of the manual oil pump to an oil inlet locking cone valve 8-1 of a next three-way valve 8 to be communicated with a next drilling stress meter 1, pressurizing the drilling stress meter 1, wherein the initial stress is 5MPa, and so on until the pressurization of each drilling stress meter 1 is finished; in the step, the elastic modulus of the oil bag 1-1 is smaller than that of the left inclusion 1-2 and that of the right inclusion 1-3, the elastic modulus of the left inclusion 1-2 and that of the right inclusion 1-3 are larger than that of the coal seam 4, and the pressure bearing capacity of the oil inlet steel pipe 3 of the oil bag 1-1 is moderate and can be used for monitoring the stress of the coal seam 4; in the step, after the drill hole 2 deforms, the coal seam 4 extrudes the left inclusion 1-2 and the right inclusion 1-3, the inclusions transmit the pressure of the coal seam 4 to the oil bag 1-1 to deform the oil bag, the oil bag transmits the changed pressure to the eight-channel stress collector 7 through hydraulic oil in the oil bag, the eight-channel stress collector 7 converts the stress variation of the I-VIII drill holes into electric signals, and the electric signals are displayed on a nixie tube of the stress collector 7-1 in real time after A/D conversion of a transmitter circuit.

Step four: gradually entering the goaf by the eight-channel stress collector 7 of the measuring area along with the pushing mining of the working face, and repeating the steps from the first step to the third step;

step five: and drilling stress monitoring data are transmitted to a ground monitoring room in real time through an armored cable, an optical transceiver and a TCP/IP Ethernet ring network, a lateral coal body supporting pressure monitoring curve diagram of a goaf is drawn according to the drilling stress monitoring data, and the width of the narrow coal pillar is determined. As can be seen from FIG. 10, the width of the narrow coal pillar of 8m is selected, the lateral coal body supporting pressure value falls in the stress reduction area and is 10MPa, and the safety production requirement of the narrow coal pillar selection is met.

In the implementation process, the lateral coal body supporting pressure monitoring curve graph is suitable for a deep well with the depth of 800-; when the well depth is 1000m, the intersection point of the stress reduction area and the stress increase area, and the intersection point of the stress increase area and the original rock stress area is 25 MPa.

In the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for describing the present invention but not for requiring the present invention to be constructed or operated in a specific orientation, and are not to be construed as limiting the invention. The terms "connected" and "connected" in the present invention are to be understood in a broad sense, and may be connected or detachably connected, for example; the terms may be directly connected or indirectly connected through intermediate components, and specific meanings of the terms may be understood as specific conditions by those skilled in the art.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (7)

1. The utility model provides a colliery goaf side direction coal body supporting pressure safety monitoring system which characterized in that: the coal seam drilling stress meter is characterized by comprising an eight-channel stress collector (7), wherein a stress channel interface of the eight-channel stress collector (7) is connected with a three-way valve (8), one end of the top of the three-way valve (8) is connected with a drilling stress meter (1) through an oil inlet steel pipe (3), the drilling stress meter (1) is arranged in a drilling hole (2) in a coal seam (4), and the other end corresponding to an oil inlet locking cone valve (8-1) is connected to an oil outlet of a manual oil pump (10) through a manual oil pump oil outlet rubber pipe (9); the eight-channel stress collector (7) is connected with the optical transceiver and the intrinsic safety power supply through an armored cable, and the drill hole (2) is arranged in a coal body lateral supporting stress monitoring and measuring area which is 100m away from the working face cutting hole.

2. The coal mine goaf side-to-side coal body support pressure safety monitoring system of claim 1, wherein: the drilling stress meter (1), the drilling hole (2) and the three-way valve (8) which are connected with the eight-channel stress collector (7) are respectively 8, wherein each hole is deepened by 3m gradually than the previous drilling hole.

3. The coal mine goaf side-to-coal body support pressure safety monitoring system of claim 1 or 2, wherein: the depth of the drilling holes (2) is respectively 2m, 5m, 8m, 11m, 14m, 17m, 20m and 23m, the aperture phi is 42mm, and the distance is 1-2 m.

4. The coal mine goaf side-to-side coal body support pressure safety monitoring system of claim 1, wherein: the eight-channel stress collector (7) is arranged between a 17m drill hole and a 20m drill hole, and the optical transceiver and the intrinsic safety power supply are placed in a chamber in a working face crossheading.

5. The coal mine goaf side-to-side coal body support pressure safety monitoring system of claim 1, wherein: the drilling stress meter (1) comprises an oil bag (1-1), the oil bag (1-1) is wrapped in a left inclusion (1-2) and a right inclusion (1-3), a connecting rod (1-6) is installed at the bottom of the right inclusion (1-3), a steel ball (1-5) is fixed at the top of the drilling stress meter (1) through a bolt (1-4), and a binding wire (1-7) is arranged at the joint of the oil bag (1-1) and the oil inlet steel pipe (3).

6. The coal mine goaf side-to-side coal body support pressure safety monitoring system of claim 5, wherein: the rear end of an oil bag (1-1) of the drilling stress meter (1) is welded with an oil inlet steel pipe (3), and the other end of the oil inlet steel pipe (3) is welded with a KJ10 female joint which is connected to a respective three-way valve (8) through a U-shaped pin.

7. The coal mine goaf side-to-side coal body support pressure safety monitoring system of claim 1, wherein: the manual oil pump (10) comprises an oil pump handle (10-1) and an oil outlet locking hand wheel (10-2).

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