CN107121100B - Monitoring method for coal body creep in coal seam - Google Patents
Monitoring method for coal body creep in coal seam Download PDFInfo
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- CN107121100B CN107121100B CN201710245234.6A CN201710245234A CN107121100B CN 107121100 B CN107121100 B CN 107121100B CN 201710245234 A CN201710245234 A CN 201710245234A CN 107121100 B CN107121100 B CN 107121100B
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/04—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string
Abstract
The invention discloses a method for monitoring coal body creep in a coal seam. The invention positions the coordinates of the vibrator in a mode that the vibrator emits vibration waves, thereby monitoring the relative position between two points of the coal body in the coal bed in real time and calculating the creep condition of the coal body along with the change of time. The invention can monitor the creep deformation in the coal body in real time and is not influenced by the environment such as temperature, humidity and the like.
Description
Technical Field
The invention relates to the technical field of coal mine monitoring, in particular to a method for monitoring coal body creep in a coal seam.
Background
One of the reasons why disasters such as rock burst disasters and coal and gas outbursts in coal mines are analyzed from a microscopic level is that coal bodies are strained or creep under the action of high stress. The stress acting on the coal body inevitably causes creep deformation, which is the microscopic manifestation of the change of the geometric state, so the creep deformation monitoring of the coal body in the coal bed is particularly important.
After 2000 years, the coal industry in China enters a high-speed development stage, a perfect mine monitoring system is established, and monitored parameters comprise gas concentration, gas pressure, coal bed stress, electromagnetic radiation monitoring, micro-seismic monitoring and the like. The existing coal body creep monitoring technology, method one, mainly tests through the rock mechanics testing system, the disadvantage of this system is that can only test the small test piece (such as the coal briquette) in the laboratory, and the process is tedious, with high costs, belong to the passive test of artificial loading; and the second method mainly adopts a strain sensor for testing, and the method determines that only the creep deformation of the surface of the test piece can be tested, the influence of temperature is large, and the sensitivity is low. The literature is inquired, and a technical method for monitoring the coal body creep in the coal seam in the mine industry is not inquired.
The creep deformation of the coal body in the coal seam under the action of the ground stress is a dynamic process, and the creep deformation of the coal body needs to be dynamically monitored in real time due to the fact that the creep deformation of the coal body occurs in the coal seam, and coal sampling detection is inconvenient, so that a novel monitoring method for the creep deformation of the coal body in the coal seam is needed.
Disclosure of Invention
The invention provides a method for monitoring creep of a coal body in a coal seam aiming at the defects. The invention positions the coordinates of the vibrator in a mode that the vibrator emits vibration waves, thereby monitoring the relative position between two points of the coal body in the coal bed in real time and calculating the creep condition of the coal body along with the change of time. The invention can monitor the creep deformation in the coal body in real time and is not influenced by the environment such as temperature, humidity and the like. The invention has the advantages of reliable technology, simple method and convenient operation.
The technical scheme of the monitoring method for coal body creep in the coal bed is that the coordinates of the vibrator are positioned in a mode that the vibrator emits vibration waves, so that the relative position between two points of the coal body in the coal bed can be monitored in real time, and the creep condition of the coal body along with the change of time is calculated.
The monitoring method for the coal body creep in the coal seam comprises the following steps:
(1) drilling two drill holes into a coal body from one or two sides of a roadway, then installing self-vibrating vibrators a and b into the coal body, wherein the self-vibrating vibrators a and b are respectively connected with a vibrator controller hung on the wall of the roadway through cables, and the controller controls the start and stop of the self-vibrating vibrators;
(2) installing a hole sealing capsule outside the drill hole, enabling a grouting pipe to penetrate through the hole sealing capsule, and grouting the interior of the drill hole by a grouting pump through the grouting pipe to fill the interior of the drill hole and ensure certain strength, so as to ensure that the self-vibration vibrator does not generate absolute displacement;
(3) fixing a vibration pickup for picking up P waves emitted from the vibration type vibrator on the wall of the tunnel;
(4) respectively starting the self-vibration vibrators a and b, monitoring by the vibration pickup, and recording the time t for transmitting the P wave emitted by the self-vibration vibrators to the vibration pickup;
(5) and calculating the spatial positions of the self-vibration vibrators a and b at different times according to a vibration wave positioning principle, and calculating the creep of the coal body between the self-vibration vibrators a and b according to the displacement difference.
According to the monitoring method for coal body creep in the coal seam, the amplitudes of the P waves emitted by the natural vibration type vibrators a and b are different.
And (3) in the step (2), the grouting pump performs grouting to the inside of the drill hole through the grouting pipe, the inside of the drill hole is filled, and the internal strength of the drill hole is not less than 20 MPA.
And (4) the vibration pickers in the step (3) are distributed at different positions of the tunnel wall.
The monitoring method for coal body creep deformation in the coal seam comprises the following steps of:
the vibration wave (P wave) generated by the self-vibration vibrator is transmitted to the periphery, the time of monitoring the vibration wave by different vibration pickups is recorded, and the coordinates of the vibrator can be solved by taking four vibration pickups as an example through the following equation:
in the formula: (x)1,y1,z1)、(x2,y2,z2)、(x3,y3,z3)、(x4,y4,z4) -geospatial coordinates, respectively for each vibration pickup, determined instrumentally by a geodetic person;
(x, y, z) -is the geospatial coordinates of the self-vibrating vibrator, i.e., the solution of the above equation set;
v is the transmission speed of the vibration wave in the medium, m/s, namely the solution of the equation set;
t is the vibration moment (vibration time) of the vibrator, the international standard time and the vibrator can record;
t1、t2、t3、t4the time (arrival time) when different vibration pickups monitor the vibration waves, the international standard time, and the vibration pickups monitor and record;
four unknowns, the values of x, y, z and v, can be solved through the four equations, and the position of the vibrator can be located.
The principle of creep calculation:
t is 0, and the distance between the natural vibration vibrators a and b is L:
at any time t, the distance between the natural vibration vibrators a and b is Lt：
Then the coal body creeps:
by calculating the creep ξ between the vibrators a and b at different time instants, the curve relation between the coal body creep ξ and the time t can be obtained, and thus the creep monitoring of the coal body is realized.
The invention has the beneficial effects that: the invention positions the coordinates of the vibrator in a mode that the vibrator emits vibration waves, thereby being capable of monitoring the relative position between two points of the coal body in the coal bed in real time, calculating the creep condition of the coal body along with the change of time, being capable of testing the creep of the coal body in the coal bed without taking a coal sample, and belonging to active testing. The invention can dynamically monitor in real time, can monitor the creep deformation in the coal body and is not influenced by the environment such as temperature, humidity and the like. The invention has the advantages of reliable technology, simple method and convenient operation.
Description of the drawings:
FIG. 1 is a schematic view of the apparatus according to embodiment 1 of the present invention;
fig. 2 is a schematic view showing distribution of vibration pickups for a right upper of a tunnel in accordance with embodiment 1 of the present invention;
in the figure, 1-tunnel, 2-controller, 3-sealing capsule, 4-sealing slurry, 5-borehole, 6-self-vibration vibrator a, 7-self-vibration vibrator b, 8-grouting pump, 9-vibration pickup, 10-tunnel wall.
The specific implementation mode is as follows:
for better understanding of the present invention, the technical solution of the present invention will be described in detail with specific examples, but the present invention is not limited thereto.
Example 1
The monitoring method for the coal body creep in the coal seam comprises the following steps:
(1) two drill holes 5 are drilled into a coal body from the right upper of a roadway 1, then self-vibration vibrators a6 and b7 (HEV series electromagnetic vibrators developed by Nanjing aerospace university) are installed in the coal body, the self-vibration vibrators a6 and b7 are respectively connected with a vibrator controller 2 hung on a roadway wall 10 through cables, and the controller 2 controls the start and stop of the self-vibration vibrators; as shown in the accompanying figure 1 of the specification,
(2) installing a hole sealing capsule 3(ZF-A22) outside the drill hole 5, enabling an injection pipe to penetrate through the hole sealing capsule 3, enabling an injection pump 8 to inject hole sealing slurry 4 into the drill hole 5 through the injection pipe, filling the interior of the drill hole 5 and ensuring that the strength is not less than 20MPA, and ensuring that the self-vibration vibrator does not generate absolute displacement;
(3) a vibration pickup 9 (1 #, 2#, 3#, 4# in figure 2 of the attached drawing of the specification) for picking up the P wave emitted from the vibration type vibrator is fixed on the left wall of the tunnel;
(4) respectively starting a self-vibration vibrator a6 and a self-vibration vibrator b7, monitoring by the vibration pickup 9, and recording the time t of P waves transmitted by the self-vibration vibrators to the vibration pickup 9;
(5) according to the vibration wave positioning principle, the spatial positions of the self-vibration vibrator a6 and the self-vibration vibrator b7 at different times are calculated, and the creep deformation of the coal body between the self-vibration vibrator a6 and the self-vibration vibrator b7 is calculated according to the displacement difference.
According to the monitoring method for coal body creep in the coal seam, the amplitudes of the P waves emitted by the natural vibration type vibrator a6 and the natural vibration type vibrator b7 are different.
4 vibration pickers 9 in the step (3) are distributed at different positions of the roadway wall 10 on the right side of the roadway.
The monitoring method for coal body creep deformation in the coal seam comprises the following steps of: the vibration wave (P wave) generated by the self-vibration vibrator is transmitted to the periphery, the time of monitoring the vibration wave by different vibration pickups 9 is recorded, and the coordinates of the vibrator can be solved through the following equation:
in the formula: (x)1,y1,z1)、(x2,y2,z2)、(x3,y3,z3)、(x4,y4,z4) Geospatial coordinates, respectively for each vibration pickup 9, measured instrumentally by a geodetic person;
(x, y, z) -is the geospatial coordinates of the self-vibrating vibrator, i.e., the solution of the above equation set;
v is the transmission speed of the vibration wave in the medium, m/s, namely the solution of the equation set;
t is the vibration moment (vibration time) of the vibrator, the international standard time and the vibrator can record;
t1、t2、t3、t4the time (arrival time) when different vibration pickups 9 monitor the vibration waves, the international standard time, and the monitoring and recording of the vibration pickups 9;
the four unknowns, the values of x, y, z and v, can be solved through the four equations, and the position of the self-vibration vibrator can be positioned.
The principle of creep calculation:
t is 0, and the distance between the natural vibration vibrator a6 and the natural vibration vibrator b7 is L:
at any time t, the distance between the natural vibrator a6 and the natural vibrator b7 is Lt：
Then the coal body creeps:
by calculating the creep ξ between the self-vibration vibrator a6 and the self-vibration vibrator b7 at different moments, the curve relation between the coal creep ξ and the time t can be obtained, and thus the creep monitoring of the coal is realized.
Claims (4)
1. A monitoring method for coal bed internal coal body creep is characterized in that the coordinates of a vibrator are positioned in a mode that the vibrator emits vibration waves, so that the relative position between two points of the coal bed internal coal body can be monitored in real time, and the creep condition of the coal body along with the change of time is calculated;
the method comprises the following steps:
(1) drilling two drill holes into a coal body from one side of a roadway, then installing self-vibrating vibrators a and b into the coal body, wherein the self-vibrating vibrators a and b are respectively connected with a vibrator controller hung on the wall of the roadway through cables, and the controller controls the start and stop of the self-vibrating vibrators;
(2) installing a hole sealing capsule outside the drill hole, enabling a grouting pipe to penetrate through the hole sealing capsule, and enabling a grouting pump to perform grouting towards the inside of the drill hole through the grouting pipe to fill the inside of the drill hole, so as to ensure that the self-vibration vibrator does not generate absolute displacement;
(3) fixing a vibration pickup for picking up P waves emitted from the vibration type vibrator on the wall of the tunnel;
(4) respectively starting the self-vibration vibrators a and b, monitoring by the vibration pickup, and recording the time t for transmitting the P wave emitted by the self-vibration vibrators to the vibration pickup;
(5) calculating the spatial positions of the self-vibration vibrators a and b at different time according to a vibration wave positioning principle, and calculating the creep of the coal body between the self-vibration vibrators a and b according to the displacement difference;
vibration wave positioning principle:
the vibration wave generated by the self-vibration vibrator, namely the P wave, is transmitted to the periphery, the time of monitoring the vibration wave by different vibration pickups is recorded, and when the number of the vibration pickups is 4, the coordinates of the vibrator can be solved through the following equation:
in the formula: (x)1,y1,z1)、(x2,y2,z2)、(x3,y3,z3)、(x4,y4,z4) -geospatial coordinates, respectively for each vibration pickup, determined instrumentally by a geodetic person;
(x, y, z) -is the geospatial coordinates of the self-vibrating vibrator, i.e., the solution of the above equation set;
v is the transmission speed of the vibration wave in the medium, m/s, namely the solution of the equation set;
t is the vibration moment of the vibrator, namely the vibration time, the international standard time, and the vibrator can record;
t1、t2、t3、t4when different vibration pickups detect vibration wavesAt moment, namely arrival time, international standard time, monitoring and recording by a vibration pickup;
four unknowns, namely the values of x, y, z and v can be solved through the four equations, and the position of the vibrator can be positioned; the principle of creep calculation:
t is 0, and the distance between the natural vibration vibrators a and b is L:
at any time t, the distance between the natural vibration vibrators a and b is Lt：
Then the coal body creeps:
by calculating the creep ξ between the vibrators a and b at different time instants, the curve relation between the coal body creep ξ and the time t can be obtained, and thus the creep monitoring of the coal body is realized.
2. The method for monitoring coal body creep deformation in the coal seam according to claim 1, wherein the amplitudes of the P waves emitted by the self-vibration vibrators a and b are different.
3. The method for monitoring coal body creep deformation in the coal seam according to claim 1, wherein in the step (2), a grouting pump is used for grouting the inside of the drill hole through a grouting pipe to fill the inside of the drill hole, so that the strength is not less than 20 MPA.
4. The method for monitoring coal body creep deformation in the coal seam according to claim 1, wherein the number of the vibration pickups in the step (3) is not less than 4, and the vibration pickups are distributed at different positions of the tunnel wall.
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| CN104101313B (en) * | 2014-08-04 | 2016-07-13 | 山东科技大学 | The quantitative observation defining method of impact coal-mass dilatation amount |
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| CN101408420A (en) * | 2008-11-27 | 2009-04-15 | 山东科技大学 | Strip bearing block long term monitoring method |
| CN203069158U (en) * | 2012-12-31 | 2013-07-17 | 河海大学 | Sensor-based high-dam deformation quick location system |
| CN104315988A (en) * | 2014-10-10 | 2015-01-28 | 中国矿业大学 | Distributive optical fiber detection method for mining overburden rock deformation |
| CN105783802A (en) * | 2015-01-14 | 2016-07-20 | 东芝泰格有限公司 | Structural deformation detecting device |
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Address after: Pan Du Xiang Li Lou Cun, yuncheng county, Heze City, Shandong Province Applicant after: Shandong Lilou Coal Industry Co.,Ltd. Applicant after: NORTH CHINA INSTITUTE OF SCIENCE AND TECHNOLOGY Address before: 065201 Yanjiao 206, Sanhe City, Langfang City, Hebei Province Applicant before: North China Institute of Science and Technology Applicant before: Shandong Lilou Coal Industry Co.,Ltd. Address after: 065201 Yanjiao 206, Sanhe City, Langfang City, Hebei Province Applicant after: NORTH CHINA INSTITUTE OF SCIENCE AND TECHNOLOGY Applicant after: Shandong Lilou Coal Industry Co.,Ltd. Address before: 065201 Yanjiao 206, Sanhe City, Langfang City, Hebei Province Applicant before: North China Institute of Science and Technology Applicant before: SHANDONG LONGYUN COAL INDUSTRY Co.,Ltd. Address after: 065201 Yanjiao 206, Sanhe City, Langfang City, Hebei Province Applicant after: NORTH CHINA INSTITUTE OF SCIENCE AND TECHNOLOGY Applicant after: SHANDONG LONGYUN COAL INDUSTRY Co.,Ltd. Address before: 065201 North China University of science and technology 206, Yanjiao, Sanhe City, Langfang City, Hebei Province Applicant before: North China Institute of Science and Technology Applicant before: SHANDONG YUNCHENG COAL MINE |
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Inventor after: Zheng Xuejun Inventor after: Cheng Jianping Inventor after: Qu Leming Inventor after: Ju Changbo Inventor after: Li Hengzhang Inventor after: Liu Jinhai Inventor after: Tian Zhaojun Inventor after: Gao Linsheng Inventor after: Wang Tao Inventor after: Wang Yong Inventor after: Zhu Quanjie Inventor after: Wang Weibin Inventor after: Zhang Zhigao Inventor before: Liu Jinhai Inventor before: Li Hengzhang Inventor before: Tian Zhaojun Inventor before: Gao Linsheng Inventor before: Cheng Jianping Inventor before: Wang Yong Inventor before: Zhu Quanjie Inventor before: Qu Leming Inventor before: Ju Changbo Inventor before: Wang Weibin |
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