Recycle type borehole stress monitoring device and monitoring method

A technology of stress monitoring and sensing devices, which is applied in the direction of measuring devices, measuring forces, instruments, etc., can solve the problems of insensitive drilling stress gauge monitoring, complicated construction, and non-recycling, so as to facilitate large-scale promotion and use and reduce drilling Quantity, easy installation and operation

Inactive Publication Date: 2016-04-13
SHANDONG UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the insensitive monitoring of borehole stress gauges in the prior art, complex construction, high cost,

Method used

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  • Recycle type borehole stress monitoring device and monitoring method
  • Recycle type borehole stress monitoring device and monitoring method
  • Recycle type borehole stress monitoring device and monitoring method

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Embodiment 1

[0035] Geological conditions at the place to be monitored: the mineable coal seams are 7#, 8#, 11-1#, 12-2# coal seams. Details are as follows:

[0036] (1) The 7# coal seam is located in the middle of the coal measures, and the direct top is mostly sandy mudstone, and the basic top is dominated by silty and fine sandstone, and partially contains medium-coarse sandstone;

[0037] (2) The distance between the 8# coal seam and the 7# coal seam is about 15m, and the Laoding Hebei area is composed of siltstone and medium-coarse sandstone, which gradually becomes interbedded with silt and fine sand toward the west;

[0038] (3) The 11# coal is located in the lower part of the coal measure, about 35m away from the 8# coal seam. The coal seam layer is stable and the structure is relatively simple. The roof is mainly made of fine sandstone, with dense structure, good cementation, and high compressive strength. The coal measure stratum is the Jurassic Datong Formation. The coal seam ...

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Abstract

The invention belongs to the field of mining pressure monitoring, and specifically relates to a recycle type borehole stress monitoring device and monitoring method. The device comprises a drilling unit, a sensor unit in connection with an input end of the drilling unit, an external oil storage unit and an external storage unit. The monitoring method comprises the following steps of: assembling the monitoring device of the invention, and sending probe rods to a designated borehole depth by a mine geological drilling rig; switching on all oil inlet control valves, activating an electric oil pump station, injecting hydraulic oil into a hydraulic jack and a hydraulic capsule, driving the hydraulic capsule at the top of the hydraulic jack to go out from an elliptical leak hole by the hydraulic jack, and switching off the oil inlet control valves; when the pressure reaches a set value, shutting off the electric oil pump station, entering the borehole stress monitoring state, and recording the value change of a digital stress meter; after the monitoring is completed, switching on all oil outlet control valves, and making the hydraulic capsule go back into the probe rods, i.e., to the original position, along with the retraction of the hydraulic jack; and removing the probe rods out of the boreholes, thereby finishing the recycle.

Description

technical field [0001] The invention belongs to the field of mining pressure monitoring, and in particular relates to a recoverable drilling stress monitoring device and a monitoring method. Background technique [0002] Underground mining in mines will force the surrounding rock stress from the original three-dimensional distribution to two-dimensional distribution, that is, cause the stress redistribution of the surrounding rock. Practice has shown that scientific understanding and mastery of the stress distribution and influence range caused by mining plays a vital role in the prediction and prevention of rock burst. The stress changes in deep surrounding rocks caused by mining are usually reflected by borehole stress gauges. Therefore, the development of borehole stress gauges has practical significance for the monitoring of stress in rock burst disaster areas in deep mining. [0003] The invention patent "drilling stress gauge for multi-point measurement in one hole" (...

Claims

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Application Information

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IPC IPC(8): G01L1/00
CPCG01L1/00
Inventor 田成林谭云亮宁建国刘学生李广波顾清恒史新帅
Owner SHANDONG UNIV OF SCI & TECH
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