Active pressure-bearing positionable borehole stress gauge and its detection method

Abstract

The invention discloses an active pressure-bearing type positioning borehole stress meter and a use method thereof. The active pressure-bearing type positioning borehole stress meter comprises a columnar shell, wherein the columnar shell is full of grease oil; a piston is arranged at one end of the columnar shell; an elastic inductor is arranged at the other end of the columnar shell; a foil gauge is arranged on the elastic inductor; a rigid bearing piece is arranged on one side of the columnar shell; the rigid bearing piece is inserted into the columnar shell; the contact parts of the rigid bearing piece and the columnar shell are in sealing contact; and an angle sensor is fixed on the columnar shell. The active pressure-bearing type positioning borehole stress meter has an active pressure-bearing function, can timely judge a change rule of the stress, can dynamically quantitative monitor a stress change condition of a danger area during the whole process and can supply a reliable data to the forecasting and preventing for the impact danger. The stress change along a certain direction can be continuously observed according to a mounting position of the stress meter, so as to further confirm the direction of the force and conveniently and specifically prevent the rock burst.

Description

Technical field [0001] The invention belongs to a coal mine monitoring instrument. Background technique [0002] The coal seams and rock layers of most mines in my country have varying degrees of impact tendency, and the impact of coal and rock is extremely serious at a certain critical depth. Although scholars at home and abroad have made important progress in the research of rockburst occurrence mechanism, monitoring methods and control technology, they are far from fundamentally solving the problems of effective prediction and prevention. As for the prediction of rock burst, due to the unclear laws of the overburden movement and the temporal and spatial distribution of the stress field of the surrounding rock after mining, the decision-making theory of development and mining is imperfect. At present, the mining design of rockburst coal seams is basically Relying on statistical experience to make decisions. Due to the lack of grasp of the inherent and essential laws of the de...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to design an active pressure-bearing positionable drilling stress gauge for the deficiencies of the existing drilling stress gauge

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