Coal-rock mass ground stress continuous testing device and method thereof

Abstract

The invention relates to a coal-rock mass ground stress continuous testing device and a method thereof which are mainly used for testing the stress and change regularity of rock in place or crushed coal-rock mass. The device consists of a ground stress sensor, a data acquisition instrument and a high pressure oil pump, which can work separately and can be connected with the data acquisition instrument to work. The ground stress sensor consists of a preposing capsule pressure sensor (1), a high-pressure oil tube (2), a tee (3), an electronic digital display hydraulic sensor (4), a valve (5) and a quick change coupler (6); wherein, the capsule pressure sensor is arranged inside a borehole, and can be well coupled with the coal-rock mass by injecting oil liquid; the ground stress testing results can be directly displayed on a pressure gauge; the sensor can be directly connected with a coal mine safety monitoring system, or the data can be acquired by the data acquisition instrument for remote data transmission, or telephone wires can be used for the communication between the sensor and ground modem as well as a computer; in ground-based computer software, the ground stress data and the change regularity thereof can be looked over.

Description

Technical field [0001] The invention relates to monitoring the size of the in-situ stress of a coal and rock mass and the change law of the in-situ stress of the coal and rock mass with mining and roof activity, and belongs to the technical field of mine in-situ stress monitoring. Background technique [0002] In-situ stress refers to the stress received by the underground coal and rock layer, which mainly includes the self-weight stress caused by the weight of the overlying rock layer and the tectonic stress caused by the action of geological structure. Self-weight stress σ v = ΓZ, γ is the specific gravity of the overlying coal and rock layer, and Z is the vertical depth. [0003] In the process of underground mining of coal and other resources, mining activities disrupted the original stress balance of coal and rock, causing the redistribution of stress around the mining space. Therefore, the stress of coal and rock mass around the mining space also includes mining stress. Aro...

AI Technical Summary

Problems solved by technology

However, it cannot be achieved The sensor is completely in close contact with the coal and rock mass at the beginning, and the initial adaptability is poor. The stress can only be tested when the coal and rock mass is in good contact with the sensor after deformation

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