A non-destructive quantitative test method for three-dimensional mining stress field in working face

Abstract

The invention discloses a non-destructive quantitative testing method for the three-dimensional mining stress field of a working face. The finally obtained three-directional mining stress field in front of the working face is obtained by using elastic wave three-dimensional CT technology and a mining stress field data processing system. The initial ground stress test points are set in the elastic wave three-dimensional CT test area in front of the working face, and the correspondence between the elastic wave velocity change gradient and the stress change gradient obtained by the true triaxial loading and unloading test and the elastic wave velocity test is fully combined. The non-destructive and quantitative test of the three-dimensional mining stress field in front of the working face has been realized. The non-destructive quantitative testing method for the three-way mining stress field of the working face described in the present invention can realize the quantitative monitoring of the three-way mining stress field in the coal rock body in front of the working face, and the monitoring result is a continuous mining stress field value , the test method does not need to drill deep holes into the coal seam of the working face, realizes non-destructive and quantitative monitoring, and solves the problem that the traditional drilling stress gauge test method can only perform qualitative tests of local single-direction mining stress, and the test results have high dispersion. issues such as poor reliability.

Description

Technical field [0001] The present invention relates to the field of stress field testing, and more particularly to a method of non-destructive quantitative testing of three-way pilot stress fields in front of coal mining work. Background technique [0002] Work face coal seam exploits the balance state of the original rock stress field in the coal rock body, leading to re-distribution of the original rock should be re-distributed (forming the stress field), forming a step-down zone, supercharge zone and regulator area in front of the work . The working surface of the working surface is the fundamental force source that leads to the breakdown of the roof rock formation, and the abnormal area of ​​the strand field is extremely easy to occur, the top plate large-scale fracture compression, impact ground pressure, coal and gas highlight, rumored surgery accidents . [0003] At present, the coal mine engineering site generally uses the pilot stress of the drilling stress to monitor t...

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Problems solved by technology

[0008] The invention provides a non-destructive quantitative test method for the three-way mining stress field in the coal rock body in front of the working face, so as to solve the problem that the traditional drilling stress gauge test method can only perform qualitative tests and test results of local single-direction stress Problems such as high dispersion and poor reliability

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