CN108801530B - Working face advanced support pressure influence range actual measurement method - Google Patents
Working face advanced support pressure influence range actual measurement method Download PDFInfo
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- CN108801530B CN108801530B CN201810980209.7A CN201810980209A CN108801530B CN 108801530 B CN108801530 B CN 108801530B CN 201810980209 A CN201810980209 A CN 201810980209A CN 108801530 B CN108801530 B CN 108801530B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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Abstract
The invention discloses a working face advanced bearing pressure influence range actual measurement method, which comprises the following steps: s1: drilling a plurality of observation drill holes on the coal rock body at intervals of a certain length s from near to far from the working face; s2: inside arranging observation drilling in with the peeping camera of rock return drilling peeping instrument, peeping the camera and passing through wire and rock return drilling peeping instrument electric connection, through the broken scope of the every country rock in observing the drilling of rock return drilling peeping instrument actual measurement. The invention can accurately and effectively measure the influence range of the advanced bearing pressure, thereby providing guidance for the caving property of top coal caving, the stability of the coal wall of a large mining height working face and the reinforced support of the advanced section of a stope working face; the invention has the characteristics of visual observation result, convenient operation, strong anti-interference capability, adjustable precision and the like, and has wide practicability.
Description
Technical Field
The invention relates to the technical field of working face extraction, in particular to a working face advanced bearing pressure influence range actual measurement method.
Background
After the stope of the working face, the overlying rock stratum is damaged and moved to cause the redistribution of stope stress, an advance bearing pressure is formed in front of the working face, the advance bearing pressure is damaged on the coal bed in front of the stope, and the deformation and the movement of a stope roadway have important influence, so that the advance bearing pressure influence range of the working face is measured in an important way, and the advance bearing pressure influence range has important guiding function on the aspects of researching the caving property of the top coal, the stability of the coal wall of the high-mining working face, the reinforced support of the advance section of the stope and the like in the next step.
The current commonly used advanced bearing pressure influence range actual measurement methods include a borehole stressometer real-time monitoring method, a roadway surface displacement movement observation method and the like. When the influence range of the advanced bearing pressure of the working face is actually measured, the borehole stress meter monitoring method is greatly influenced by factors such as surrounding rocks, instruments and installation, and is easy to generate larger errors; when the moving observation method for roadway surface displacement is used for realizing the measurement, workers are required to record data on time, the problems that the data analysis is inaccurate due to untimely data recording and low precision of the workers often occur, the two methods are time-consuming and labor-consuming, and the measured result is not visual. Therefore, it is necessary to design a working surface advanced bearing pressure influence range actual measurement method with intuitive observation result, convenient operation and adjustable precision.
Disclosure of Invention
The invention aims to provide a working face advanced bearing pressure influence range actual measurement method which has the characteristics of visual observation result, convenience in operation, strong anti-interference capability, adjustable precision and the like and has wide practicability.
In order to achieve the purpose, the invention provides the following technical scheme: a working face leading support pressure influence range actual measurement method comprises the following steps:
s1: drilling a plurality of observation drill holes on the coal rock body at intervals of a certain length s from near to far from the working face;
s2: arranging a peeping camera of the rock-return drilling peeping instrument in the observation drill holes, electrically connecting the peeping camera with the rock-return drilling peeping instrument through a lead, and actually measuring the surrounding rock crushing range in each observation drill hole through the rock-return drilling peeping instrument;
s3: according to the limit balance theory, the range of the surrounding rock crushing area of the roadway is as follows:
in the formula: p-surrounding rock pressure; p is a radical ofi-support resistance; c- -cohesion of the rock mass;
-the internal friction angle of the rock mass; a- - -roadway radius; rs- -crushing zone radius; according to the formula, under the same other conditions, the range of the roadway surrounding rock crushing area is increased along with the increase of the surrounding rock pressure; the surrounding rock pressure of the advanced section of the stoping roadway changes along with the change of the distance from the working surface due to the influence of the advanced supporting pressure of the working surface on the stoping roadway of the working surface; according to the principle, the working face advanced support can be determined by actually measuring the range of the surrounding rock crushing area of the roadwayThe pressure influence range;
s4: when the distance from the working surface is close, the range of the surrounding rock crushing area of the roadway is large; after a certain distance L1 from the working surface, the crushing area range begins to decrease, and the distance L1 is the distance of the leading support pressure peak value;
s5: after the distance L from the working surface, the range of the crushing area is not reduced any more and is stabilized to the range of the crushing area influenced by the stress of the original rock, and the distance L is the influence range of the advanced support pressure;
further, the length S between each two observation holes in the step S1 is determined by the measured accuracy.
Further, the length of the observation drill hole in the step S1 is 2-3 times of the estimated roadway surrounding rock crushing area in the formula.
Compared with the prior art, the invention has the beneficial effects that: the working face advanced bearing pressure influence range actual measurement method can accurately and effectively measure the advanced bearing pressure influence range, thereby providing guidance for caving of top coal, stability of coal walls of large mining height working faces and reinforcement support of the super front section of a stope; the invention has the characteristics of visual observation result, convenient operation, strong anti-interference capability, adjustable precision and the like, and has wide practicability.
Drawings
FIG. 1 is a schematic structural diagram of the present invention
1. A coal rock mass; 2. observing the drilled hole; 3. peeping the camera; 4. a wire; 5. a rock-return drilling peeping instrument.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Examples
The invention provides the following technical scheme: a working face leading support pressure influence range actual measurement method comprises the following steps:
s1: drilling a plurality of observation drill holes 2 on the coal rock body 1 at intervals of a certain length s from near to far from the working face;
s2: arranging a peeping camera 3 of a rock return drilling peeping instrument 5 in the observation drill holes 2, electrically connecting the peeping camera 3 with the rock return drilling peeping instrument 5 through a lead 4, and actually measuring the surrounding rock crushing range in each observation drill hole 2 through the rock return drilling peeping instrument 5;
s3: according to the limit balance theory, the range of the surrounding rock crushing area of the roadway is as follows:
in the formula: p-surrounding rock pressure; p is a radical ofi-support resistance; c- -cohesion of the rock mass;
-the internal friction angle of the rock mass; a- - -roadway radius; rs- -crushing zone radius; according to the formula, under the same other conditions, the range of the roadway surrounding rock crushing area is increased along with the increase of the surrounding rock pressure; the surrounding rock pressure of the advanced section of the stoping roadway changes along with the change of the distance from the working surface due to the influence of the advanced supporting pressure of the working surface on the stoping roadway of the working surface; according to the principle, the influence range of the advanced supporting pressure of the working face can be determined by actually measuring the range of the surrounding rock crushing area of the roadway;
s4: when the distance from the working surface is close, the range of the surrounding rock crushing area of the roadway is large; after a certain distance L1 from the working surface, the crushing area range begins to decrease, and the distance L1 is the distance of the leading support pressure peak value;
s5: after the distance L from the working surface, the range of the crushing area is not reduced any more and is stabilized to the range of the crushing area influenced by the stress of the original rock, and the distance L is the influence range of the advanced support pressure.
The length S between each two observation boreholes 2 in the step S1 depends on the measured accuracy, which facilitates the adjustment of the accuracy.
And in the step S1, the length of the observation drill hole 2 is 2-3 times of the estimated roadway surrounding rock crushing area in the formula, so that the numerical value detection is facilitated.
During specific operation, firstly drilling an observation drill hole 2 into a coal rock body 1 in a stoping roadway of a working face at a front section, firstly drilling a No. 1 observation drill hole 2, then actually measuring a surrounding rock crushing range in the No. 1 observation drill hole 2 by using a stoping drill hole peeping instrument 5, sequentially drilling 2#, 3#, 4# … and other observation drill holes 2 at intervals of length s by the same method, and then actually measuring the surrounding rock crushing range in the observation drill hole 2 by using the stoping drill hole peeping instrument 5; if the crushing area range begins to decrease when the No. 5 observation drill hole 2 is observed, the distance of the leading support pressure peak value of the working face is L1; and if the scope of the crushing zone is not reduced any more and is stabilized to the scope of the crushing zone influenced by the stress of the original rock when the No. 16 observation drill hole 2 is observed, the distance L is the influence scope of the advanced supporting pressure, and the influence distance of the advanced supporting pressure of the working surface is L.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (3)
1. A working face advance bearing pressure influence range actual measurement method is characterized by comprising the following steps:
s1: drilling a plurality of observation drill holes (2) on the coal rock body (1) from near to far from a working face at intervals of a certain length s;
s2: arranging a peeping camera (3) of a rock-returning drilling peeping instrument (5) in the observation drill holes (2), electrically connecting the peeping camera (3) with the rock-returning drilling peeping instrument (5) through a lead (4), and actually measuring the surrounding rock crushing range in each observation drill hole (2) through the rock-returning drilling peeping instrument (5);
s3: according to the limit balance theory, the range of the surrounding rock crushing area of the roadway is as follows:
in the formula: p-surrounding rock pressure; p is a radical ofi-support resistance; c- -cohesion of the rock mass;
-the internal friction angle of the rock mass;a-the radius of the roadway; rs- -crushing zone radius; according to the formula, under the same other conditions, the range of the roadway surrounding rock crushing area is increased along with the increase of the surrounding rock pressure; the surrounding rock pressure of the advanced section of the stoping roadway changes along with the change of the distance from the working surface due to the influence of the advanced supporting pressure of the working surface on the stoping roadway of the working surface; according to the principle, the influence range of the advanced supporting pressure of the working face can be determined by actually measuring the range of the surrounding rock crushing area of the roadway;
s4: when the distance from the working surface is close, the range of the surrounding rock crushing area of the roadway is large; after a certain distance L1 from the working surface, the crushing area range begins to decrease, and the distance L1 is the distance of the leading support pressure peak value;
s5: after the distance L from the working surface, the range of the crushing area is not reduced any more and is stabilized to the range of the crushing area influenced by the stress of the original rock, and the distance L is the influence range of the advanced support pressure.
2. The method for measuring the influence range of the leading support pressure of a working face as claimed in claim 1, wherein the length S between each two observation holes (2) in the step S1 is determined by the measurement accuracy.
3. The method for actually measuring the influence range of the advance support pressure of the working face as claimed in claim 1, wherein the length of the observation borehole (2) in the step S1 is 2-3 times of the estimated range of the surrounding rock crushing area of the roadway in the formula.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810980209.7A CN108801530B (en) | 2018-08-27 | 2018-08-27 | Working face advanced support pressure influence range actual measurement method |
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| CN201810980209.7A CN108801530B (en) | 2018-08-27 | 2018-08-27 | Working face advanced support pressure influence range actual measurement method |
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| CN108801530A CN108801530A (en) | 2018-11-13 |
| CN108801530B true CN108801530B (en) | 2020-07-03 |
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| CN110295880B (en) * | 2019-07-04 | 2021-05-14 | 中国矿业大学 | Method for optimizing stoping line of multi-dimensional hydraulic fracturing coal seam roof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202485845U (en) * | 2012-02-10 | 2012-10-10 | 天地科技股份有限公司 | Device for monitoring lateral bearing pressure of stoping tunnel |
| CN103994846A (en) * | 2014-06-06 | 2014-08-20 | 中国矿业大学 | Device and method for testing surrounding rock stress field distribution |
| CN104748897A (en) * | 2015-03-15 | 2015-07-01 | 中国矿业大学 | In-situ mining-induced stress monitoring method and device for underground workface of coal mine |
| CN108051125A (en) * | 2017-12-06 | 2018-05-18 | 中国矿业大学(北京) | A kind of closed goaf caving zone stress field evolution measurement method |
-
2018
- 2018-08-27 CN CN201810980209.7A patent/CN108801530B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202485845U (en) * | 2012-02-10 | 2012-10-10 | 天地科技股份有限公司 | Device for monitoring lateral bearing pressure of stoping tunnel |
| CN103994846A (en) * | 2014-06-06 | 2014-08-20 | 中国矿业大学 | Device and method for testing surrounding rock stress field distribution |
| CN104748897A (en) * | 2015-03-15 | 2015-07-01 | 中国矿业大学 | In-situ mining-induced stress monitoring method and device for underground workface of coal mine |
| CN108051125A (en) * | 2017-12-06 | 2018-05-18 | 中国矿业大学(北京) | A kind of closed goaf caving zone stress field evolution measurement method |
Non-Patent Citations (2)
| Title |
|---|
| 复杂地质条件下窄煤柱巷道掘进技术研究与应用;孟凡武等;《中国煤炭学会煤矿机电一体化专业委员会、中国电工技术学会煤矿电工专业委员会论文集》;20081231;第29-33页 * |
| 综放工作面超前支承压力分布及顶煤破坏规律研究;候文杰;《煤》;20170228;第26卷(第2期);第64-66页 * |
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