CN116066073A - Mining face mining stress monitoring method suitable for complex coal seam - Google Patents
Mining face mining stress monitoring method suitable for complex coal seam Download PDFInfo
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- CN116066073A CN116066073A CN202211725670.0A CN202211725670A CN116066073A CN 116066073 A CN116066073 A CN 116066073A CN 202211725670 A CN202211725670 A CN 202211725670A CN 116066073 A CN116066073 A CN 116066073A
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- 239000003245 coal Substances 0.000 title claims abstract description 73
- 238000005065 mining Methods 0.000 title claims abstract description 40
- 238000012544 monitoring process Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 19
- 239000011440 grout Substances 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 10
- 210000000078 claw Anatomy 0.000 claims description 18
- 238000012360 testing method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/007—Measuring stresses in a pipe string or casing
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Remote Sensing (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention belongs to the technical field of coal mine safety, and relates to a mining stress monitoring method suitable for a coal mine working face of a complex coal seam, which comprises the following steps: s1, drilling a coal mine working face to a mining stress monitoring depth by adopting an open-close type drill bit which is connected to a hollow drill rod in a matched manner; s2: sending the stress gauge into the bottom of the drill hole through the hollow drill rod and the internal channel of the open-close drill bit, and connecting the stress gauge with a data acquisition instrument arranged outside the drill hole through a data line; s3: after the stress gauge is placed in place, inserting a grouting pipe into the bottom of a drilling hole through the hollow drill rod and the internal channel of the open-close drill bit, and arranging a slurry return pipe at the top of the opening of the drilling hole; s4: withdrawing the hollow drill rod and the open-close drill bit, plugging the drill hole, grouting through the grouting pipe, stopping grouting after the grout in the grout returning pipe flows out, and plugging the grouting pipe and the grout returning pipe; s5: after the slurry in the drill hole is solidified and balanced, the mining stress in the drill hole can be detected through a data acquisition instrument.
Description
Technical Field
The invention belongs to the technical field of coal mine safety, and relates to a mining stress monitoring method suitable for a coal mine working face of a complex coal seam.
Background
Mining stress is known as "secondary stress" and is the stress developed after redistribution in the rock mass under the influence of mining. Many coal mines are complex in structure and fault development, and a working face often meets faults, even if the working face is arranged along the faults. Because fault cutting damages the integrity of the rock stratum, the propagation of mining stress is affected, and the mining stress field near the fault has singularity. The local stress concentration of the coal body is a main internal factor for inducing the occurrence of rock burst of the coal mine, and the dynamic stress monitoring of the coal body can grasp the mining disturbance range, the degree and the time characteristics and can be used as an important analysis basis for rock burst early warning. Meanwhile, the change of the internal stress gradient of the coal mine working face also affects the change of the gas seepage field, so that the local gas accumulation condition in the working face and the gas emission change in the roadway are generated, and the gas outburst and overrun risk can be comprehensively researched and judged by combining the monitoring information of the coal permeability, the geological structure and the gas emission.
The existing mining stress monitoring method for the coal mine working face is mainly characterized in that drilling holes perpendicular to the coal body of the working face are implemented in the working face gateway, stress sensors are buried in the coal body, and data of the stress sensors are read through data lines, so that real-time stress monitoring is achieved. Because the coal seam where part of the coal mine working face is located has complex geological conditions and more geological structures, or the coal quality is softer, the phenomenon of hole collapse often occurs after drilling construction and withdrawing the drill rod, and the difficulty of pushing the stress sensor to the designated position is high, so that the stress change condition within a range of ten meters from the coal wall can only be monitored, and the dynamic monitoring of the whole working face area range can not be realized.
Therefore, a mining stress monitoring method suitable for a coal mine working face under a complex coal seam condition is urgently needed at present so as to overcome the hole collapse phenomenon caused by the complex coal seam and realize fixed-point mining stress monitoring under different depths of the coal mine working face under the complex coal seam condition.
Disclosure of Invention
In view of the above, the invention aims to provide a mining stress monitoring method of a coal mine working face suitable for a complex coal seam, which is characterized in that an openable drill bit connected to a hollow drill rod in a matched manner is used for drilling the coal mine working face, and a stress gauge is sent to a designated depth in the coal mine working face through the drill rod and an internal channel of the drill bit, so that the problem that the stress gauge cannot be put in due to collapse of a drill hole after the drill rod is pulled out under the condition of the complex coal seam is avoided, the technical problem in the background technology is solved, and the fixed-point mining stress monitoring of the coal mine working face under the condition of the complex coal seam under different depths can be realized.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the mining stress monitoring method suitable for the coal mine working face of the complex coal seam comprises the following steps:
s1, drilling a coal mine working face to a mining stress monitoring depth by adopting an open-close type drill bit which is connected to a hollow drill rod in a matched manner;
s2: sending a stress meter into the bottom of a drill hole through the hollow drill rod and an internal channel of the open-close drill bit, wherein the stress meter is connected with a data acquisition instrument arranged outside the drill hole through a data line;
s3: after the stress gauge is placed in place, inserting a grouting pipe into the bottom of a drilling hole through the hollow drill rod and an internal channel of the open-close drill bit, and arranging a slurry return pipe at the top of an opening of the drilling hole;
s4: withdrawing the hollow drill rod and the open-close drill bit, plugging the drill hole, grouting through the grouting pipe, stopping grouting after the grout in the grout returning pipe flows out, and plugging the grouting pipe and the grout returning pipe;
s5: and after the slurry in the drill hole is solidified and balanced, the mining stress in the drill hole can be detected through the data acquisition instrument.
In step S2, before placing the stress gauge, the internal channels of the hollow drill rod and the open-close drill bit are used to send the direction finder to the bottom of the drill hole for testing the placement direction of the stress gauge, and after testing, the stress gauge is placed after the direction finder is withdrawn.
Further, the strain gauge is provided with at least three strain gauges uniformly distributed along the circumference, and each strain gauge is provided with at least four resistance strain gauges.
Further, one end of the stress gauge, which is close to the bottom of the drill hole, is connected with a claw hook fixing device which is connected with the inner wall of the drill hole, and one end of the stress gauge, which is close to the opening of the drill hole, is connected with a data cable protection tube which is used for protecting a data cable;
in step S4, when the stress gauge enters the bottom of the borehole through the hollow drill rod and the internal channel of the open-close drill bit, the claw hook fixing device is not limited by the inner wall of the drill rod any more, and the claw hook opens to hook the coal body on the inner wall of the borehole, so that the stress gauge is left at the bottom of the borehole.
In step S3, after the grouting pipe is inserted into the bottom of the borehole, the grouting pipe is fixedly connected with the data cable protection pipe.
Further, the data acquisition instrument is connected to a ground monitoring system through a mine industrial ring network.
The invention has the beneficial effects that:
compared with the monitoring method in the prior art, the mining stress monitoring method for the coal mine working face is characterized in that the open-close type drill bit connected to the hollow drill rod in a matched mode is used for drilling the coal mine working face, and the stress gauge is sent to the designated depth in the coal mine working face through the drill rod and the internal channel of the drill bit, so that the problem that the stress gauge cannot be put in due to borehole collapse caused by the fact that the drill rod is pulled out under the condition of a complex coal seam is avoided, fixed-point mining stress monitoring under different depths of the coal mine working face under the condition of the complex coal seam can be achieved, the problem that the stress gauge is difficult to put in under the condition of the complex coal seam is solved, and the mining stress monitoring method is suitable for stress monitoring of special complex geological conditions such as soft coal seams with more structures.
And secondly, cement pouring is carried out on the drilled holes, so that the coupling of the stress meter and the coal seam in the coal mine working face can be better realized, more accurate mining stress of the coal mine working face is provided, accurate monitoring of the mining stress under the condition of a complex coal seam is ensured, the safety detection of the coal mine working face is ensured, and the occurrence of safety accidents is avoided.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a device for monitoring mining stress of a coal mine working face according to an embodiment;
FIG. 2 is a schematic view of the structure of the claw hook fixing device in the embodiment;
FIG. 3 is a schematic diagram of a stress gauge in an embodiment;
FIG. 4 is a schematic diagram of example step 1;
FIG. 5 is a schematic diagram of example step 2;
FIG. 6 is a schematic diagram of example step 3;
FIG. 7 is a schematic diagram of example step 4;
FIG. 8 is a schematic diagram of example step 5;
FIG. 9 is a schematic diagram of example step 6;
fig. 10 is a cross-sectional view of fig. 6.
Drawing figures marking: the device comprises a coal mine working face 1, a hollow drill rod 2, an orientation instrument 3, a push rod 4, an orientation instrument data line 5, a claw hook fixing device 6, a stress gauge 7, an epoxy resin cylinder 71, a strain gauge 72, a grouting pipe 8, a resistance strain gauge 73, a data cable protection pipe 9, a stress gauge data cable 10, a grouting hose 11, a grouting pump 12, a hole packer 13, a slurry return pipe 14, a data acquisition instrument 15, a mine industrial ring network 16 and a ground monitoring system 17.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1 to 10, a mining stress monitoring method for a coal mine working face applicable to a complex coal seam comprises the following steps:
s1, drilling a coal mine working face 1 to a mining stress monitoring depth by adopting an open-close type drill bit which is connected to a hollow drill rod 2 in a matched manner by adopting the hollow drill rod 2;
s2: sending a stress meter into the bottom of a drill hole through the hollow drill rod 2 and an internal channel of the open-close drill bit, wherein the stress meter 7 is connected with a data acquisition instrument 15 arranged outside the drill hole through a stress meter data cable 7;
s3: after the stress gauge 7 is placed in place, the grouting pipe 8 is inserted into the bottom of a drilling hole through the hollow drill rod 2 and the internal channel of the open-close drill bit, and a slurry return pipe 14 is arranged at the top of the opening of the drilling hole;
s4: withdrawing the hollow drill rod 2 and the open-close drill bit, plugging the drill hole, grouting through the grouting pipe 8, stopping grouting after the grout in the grout return pipe 14 flows out, and plugging the grouting pipe 8 and the grout return pipe 17;
s5: after the slurry in the drill hole is solidified and balanced, the mining stress in the drill hole can be detected through the data acquisition instrument 15.
Preferably, in step S2, before placing the stress gauge 7, the direction of placing the stress gauge 7 is tested by sending the direction finder 3 into the bottom of the drill hole through the hollow drill rod 2 and the internal channel of the open-close drill bit, and after the test is completed, the direction finder 3 is withdrawn and then the stress gauge 7 is placed.
In step S4, when the strain gauge 7 enters the bottom of the borehole through the hollow drill rod 2 and the internal passage of the open-close drill bit, the claw hook fixing device is not limited by the inner wall of the drill rod any more, and the claw hook opens to hook the coal body on the inner wall of the borehole, so that the strain gauge 7 is left at the bottom of the borehole. In step S3, after the grouting pipe 8 is inserted into the bottom of the borehole, the grouting pipe 8 is fixedly connected with the data cable protection pipe 9. The data acquisition instrument 15 is connected to a ground monitoring system 17 through a mine industry loop network 16.
Referring to fig. 4 to 9, the construction steps of the mining stress monitoring method for the coal mine working face are as follows:
step 1: firstly, selecting an opening position on a coal mine working face 1, and then performing horizontal drilling construction according to design requirements;
step 2: installing an orientation instrument 3 at the front end of a push rod 4, pushing the orientation instrument 3 from an internal channel of a hollow drill rod 2 to the bottom of a drill hole by using the push rod 4, stopping pushing the orientation instrument 3 after the orientation instrument 3 is pushed to the bottom of the drill hole, actually measuring the direction and the angle required by a strain gauge in a stress meter 7 by using the orientation instrument 3, providing a basis for calculating the magnitude and the direction of the maximum, minimum and vertical stress monitored, and withdrawing the orientation instrument 3 after measuring direction data;
step 3: the front end of the stress meter 7 is fixedly provided with a claw hook fixing device 6, the rear end of the stress meter 7 is provided with data cable protection pipes 9 one by one, the stress meter 7 is pushed to the hole bottom through the internal channel of the hollow drill rod 2, and the grouting pipe 8 is inserted into the hole bottom and fixed on the data cable protection pipes 9;
step 4: the hollow drill rod 2 is withdrawn, and at the moment, the claw hook fixing device 6 is not limited by the inner wall of the drill rod any more, and the claw hook is opened to hook the coal body on the hole wall, so that the stress meter 7 is left in the drill hole;
step 5: after the hollow drill rod 2 is withdrawn, a slurry return pipe 14 is arranged at the orifice, the orifice is plugged by a hole packer 13, expansion cement is injected into the drilled hole by a grouting pump 12, when the grouting pipe 14 returns the grouting, the grouting pump 12 is closed, valves of the grouting pipe 8 and the grouting pipe 14 are screwed up, and after 24 hours, the expansion cement is solidified and balanced;
step 6: the stress meter 7 is connected with the data acquisition instrument 15, and data is transmitted to the ground monitoring system 17 through the mine industrial ring network 16.
Specifically, the stress meter 7 is an improved type of a conventional hollow inclusion stress meter, the front end of the stress meter 7 can be connected with a claw hook fixing device 6, the rear end of the stress meter 7 can be connected with a data cable protection tube 9 for protecting a data cable 10 of the stress meter, the body of the stress meter 7 is an epoxy resin cylinder 71, at least three strain gauges 72 uniformly distributed along the circumference are arranged on the epoxy resin cylinder 71, and at least four resistance strain gauges 73 are arranged on each strain gauge; the main body of the claw hook fixing device 6 is a hollow pipe, three claw hooks are arranged outside the pipe wall, the claw hooks are in an extension state in a normal state, the claw hooks can be recovered to the pipe wall groove when being stressed, and one end of the main body is connected with the stress meter 7; the hollow drill rod 2 is a large-diameter drill rod, specifically is one of a groove spiral drill rod, a large-diameter wide-blade spiral drill rod or a triangular spiral drill rod, and the open-close drill bit is specifically a large-through hole open-close type omnibearing drilling drill bit which can be pushed open from the inside so as to place a stress meter.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (6)
1. The mining stress monitoring method for the coal mine working face suitable for the complex coal seam is characterized by comprising the following steps of:
s1, drilling a coal mine working face to a mining stress monitoring depth by adopting an open-close type drill bit which is connected to a hollow drill rod in a matched manner;
s2: sending a stress meter into the bottom of a drill hole through the hollow drill rod and an internal channel of the open-close drill bit, wherein the stress meter is connected with a data acquisition instrument arranged outside the drill hole through a data line;
s3: after the stress gauge is placed in place, inserting a grouting pipe into the bottom of a drilling hole through the hollow drill rod and an internal channel of the open-close drill bit, and arranging a slurry return pipe at the top of an opening of the drilling hole;
s4: withdrawing the hollow drill rod and the open-close drill bit, plugging the drill hole, grouting through the grouting pipe, stopping grouting after the grout in the grout returning pipe flows out, and plugging the grouting pipe and the grout returning pipe;
s5: and after the slurry in the drill hole is solidified and balanced, the mining stress in the drill hole can be detected through the data acquisition instrument.
2. The mining stress monitoring method for the coal mine working face applicable to the complex coal seam according to claim 1, wherein the method comprises the following steps of: in step S2, before placing the stress gauge, the stress gauge is required to be placed after the stress gauge is withdrawn from the orientation meter after the test is completed by sending the orientation meter to the bottom of the drill hole through the hollow drill rod and the internal channel of the open-close drill bit for testing the placing direction of the stress gauge.
3. The mining stress monitoring method for the coal mine working face applicable to the complex coal seam according to claim 2, wherein the method comprises the following steps of: the strain gauge is provided with at least three strain gauges which are uniformly distributed along the circumference, and each strain gauge is provided with at least four resistance strain gauges.
4. The mining stress monitoring method for the coal mine working face applicable to the complex coal seam according to claim 1, wherein the method comprises the following steps of: the end, close to the bottom of the drill hole, of the stress gauge is connected with a claw hook fixing device used for being connected with the inner wall of the drill hole, and the end, close to the opening of the drill hole, of the stress gauge is connected with a data cable protection tube used for protecting a data cable;
in step S2, when the stress gauge enters the bottom of the borehole through the hollow drill rod and the internal channel of the open-close drill bit, the claw hook fixing device is not limited by the inner wall of the drill rod any more, and the claw hook opens to hook the coal body on the inner wall of the borehole, so that the stress gauge is left at the bottom of the borehole.
5. The mining stress monitoring method for the coal mine working face applicable to the complex coal seam according to claim 4, wherein the method comprises the following steps of: in step S3, after the grouting pipe is inserted into the bottom of the drilling hole, the grouting pipe is fixedly connected with the data cable protection pipe.
6. A method of mining face mining stress monitoring for a complex coal seam according to any one of claims 1 to 4, wherein: the data acquisition instrument is connected to the ground monitoring system through a mine industrial ring network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211725670.0A CN116066073A (en) | 2022-12-29 | 2022-12-29 | Mining face mining stress monitoring method suitable for complex coal seam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211725670.0A CN116066073A (en) | 2022-12-29 | 2022-12-29 | Mining face mining stress monitoring method suitable for complex coal seam |
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| CN116066073A true CN116066073A (en) | 2023-05-05 |
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| CN202211725670.0A Pending CN116066073A (en) | 2022-12-29 | 2022-12-29 | Mining face mining stress monitoring method suitable for complex coal seam |
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| CN115389067A (en) * | 2022-08-03 | 2022-11-25 | 中国科学院武汉岩土力学研究所 | Ground stress and microseismic integrated monitoring device and system |
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| CN102277881A (en) * | 2010-06-09 | 2011-12-14 | 辽宁省水利水电科学研究院 | Burying device for strain gauge |
| CN102977869A (en) * | 2012-12-27 | 2013-03-20 | 重庆大学 | Underground high-pressure hydraulic fracturing hole sealing material for coal mine and hole sealing technology |
| CN103076119A (en) * | 2012-12-28 | 2013-05-01 | 煤炭科学研究总院 | Method for measuring floor heave main control stress of laneway |
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