A Method for Measuring the Influence Range of Leading Bearing Pressure on Working Face
A technology of advanced support and influence range, applied in the direction of force/torque/work measuring instruments, measuring devices, instruments, etc., can solve the problems of inaccurate data analysis, low precision, and untimely record data of workers, and achieve the observation results Intuitive, strong anti-interference ability, wide practical effect
Inactive Publication Date: 2020-07-03
SHENMU LONGDE MINING IND
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Problems solved by technology
When the borehole stress gauge monitoring method is used to measure the influence range of the leading bearing pressure on the working face, it is greatly affected by factors such as surrounding rock, instruments, and installation, and is prone to large errors; when the mobile observation method of the surface displacement of the roadway is actually measured, workers To record data on time, there are often problems such as inaccurate data analysis caused by workers not recording data in time and with low precision. The above two methods are time-consuming and labor-intensive, and the actual measurement results are not intuitive.
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Embodiment
[0018] The present invention provides the following technical solutions: a method for actual measurement of the influence range of the leading support pressure of a working face, including the following steps:
[0019] S1: Drill a number of observation boreholes 2 in the coal rock mass 1 at intervals of a certain length s from near and far away from the working face;
[0020] S2: Put the peeping camera 3 of the rock-return borehole spy 5 inside the observation borehole 2, and the peep camera 3 is electrically connected to the rock-return borehole sight 5 through the wire 4, and each is measured by the rock-return borehole sight 5 The surrounding rock fragmentation range in the observation borehole 2;
[0021] S3: According to the limit equilibrium theory, the range of the broken zone of the surrounding rock of the roadway is as follows: Where: p---pressure of surrounding rock; p i --Supporting resistance; c---cohesion of rock mass; ---Internal friction angle of rock mass; a---Roadw...
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The invention discloses an actual measurement method for the influence range of the advance support pressure of the working face, comprising the following steps: S1, drilling several observation holesin the coal rock body every a certain distance a from the near to the distance from the working face; S2, placing a peeping camera of a back to rock drilling peeping instrument inside the observationholes, electrically connecting the peeping camera to the back to rock drilling peeping instrument through a wire, and actually measuring the surrounding rock fracture range in each observation hole by the back to rock drilling peeping instrument. The method can accurately and effectively measure the influence range of the advance support pressure, thereby providing a guiding role for the top coalcavibility of the top coal, the stability of the coal wall of the large mining height working face, and the strengthening support of the ahead mining section of the stope face; and the method has thecharacteristics of intuitive observation, convenient operation, strong anti-interference ability and adjustable precision, and has wide practicality.
Description
Technical field [0001] The invention relates to the technical field of working face mining, in particular to a method for actually measuring the influence range of the working face's advanced supporting pressure. Background technique [0002] After the working face is mined, the overlying rock strata will be destroyed and moved, causing the stope stress to redistribute, forming advanced supporting pressure in front of the working face, which has an important impact on the coal seam in front of the stope and the deformation and movement of the mining roadway. The actual measurement of the influence range of the advanced support pressure is very important, and it is important for the next study of the top coal caving property of the top coal caving, the stability of the coal wall of the large mining height face, and the strengthened support of the advanced section of the mining face. Guiding role. [0003] At present, the commonly used actual measurement methods of the influence ran...
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IPC IPC(8): G01L5/00
CPCG01L5/00
Inventor 张勇冉星仕马清水任崇鹏李玺
Owner SHENMU LONGDE MINING IND