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 ground stress of coal and rock mass and the variation law of the ground stress of coal and rock mass with mining and roof activity, and belongs to the technical field of mine ground stress monitoring. Background technique [0002] In-situ stress refers to the stress on the underground coal strata, mainly including the self-gravity stress caused by the self-weight of the overlying strata and the tectonic stress caused by the geological structure. Self-weight stress σ v =γZ, γ is the specific gravity of the overlying coal strata, and Z is the vertical depth. [0003] During the underground mining of coal and other resources, mining activities destroy the original stress balance state of coal and rock, causing stress redistribution around the mining space. Therefore, the stress of coal and rock mass around the mining space also includes the mining stress. Around the stope and mining roadway, due to th...

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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