An online monitoring device for lateral deformation of coal body and its monitoring method

Abstract

The invention discloses an on-line monitoring coal body lateral deformation device and a monitoring method thereof, which belong to the fields of coal mine rock burst prevention and mine rock mass deformation monitoring. It includes a data processing unit located on the well, a data transmission unit located on the working face and at least one measurement unit located in the borehole; the measurement unit includes a hydraulic lateral displacement measuring instrument, a fixed snap ring and a push rod, and the fixed snap ring is a hollow ring structure , including a ring surface and a cavity, the ring surface is provided with a line opening near the outer side, and at least one staple and a guide groove matching it are arranged on the ring surface, the staple can slide clockwise in the guide groove, The sharp part of the staple protrudes from the ring surface, and a step is provided at the clockwise sliding direction of the staple, and a certain included angle is formed between the bottom layer of the step and the staple. Multiple devices can be arranged in the same borehole of the present invention, which not only realizes simultaneous monitoring of multiple points in one hole, but also solves the problem of mutual interference of monitoring points, and the data is accurate and effective.

Description

technical field [0001] The invention relates to the fields of prevention and control of rock burst in coal mines and deformation monitoring of rock mass in mines, in particular to an online monitoring device for lateral deformation of coal mass and a monitoring method thereof. Background technique [0002] During the mining process of the mine working face, the coal body may be affected by the mine pressure, which may cause rock burst accidents, and the deformation of the roadway is serious, which poses a great threat to the safe production of the working face and the life safety of the staff. The lateral deformation of coal body is one of the phenomena of mine pressure, and it is also an important reference condition for judging whether rock burst occurs. Because the coal body can be mined, it is greatly affected by the mining ore, and the data monitoring interval is required to be short. Therefore, the invention of an online monitoring device for lateral deformation of the...

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Problems solved by technology

[0003] At present, many scholars at home and abroad have developed some devices and methods for detecting coal body deformation in coal mining face. Large and small diameter steel pipes (with displacement scale lines) in the borehole are subjected to the relative displacement generated by the deformation of the coal body to characterize the deformation of the coal body. Although this detector and detection method can monitor the deformation of the coal body at different times, it cannot monitor the deformation of the coal body in real time. The recorded data can only be read by the staff at different times; patent 20141037533.9 proposes "the method for monitoring and determining the width of the lateral coal plastic zone in the gob area of ​​the working face". Stress meter monitors the stress change of each measuring point and determines the width of the plastic zone of the coal body. This method judges the damage range of the coal body by monitoring the type of stress change curve, and cannot directly display the lateral deformation of the coal body and the monitoring of multiple points in one hole; Patent 201410379987.2 discloses a method for quantitative observation and determination of impact coal expansion capacity. A stress observation device and two displacement observation devices are installed in three horizontal observation boreholes to record the vertical and lateral displacements of the coal seam, and the monitoring points are obtained. The expansion capacity of the method is large and the operation is cumbersome

[0004] To sum up, the existing devices and methods are completed in different boreholes, there are many influencing factors, and the measured results have a large dispersion

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