Method for Predicting the Principal Stress Direction of Underground Stress Field in Coal Mine

Abstract

The invention relates to an underground coal mine stress field principal stress direction predicting method. The method is mainly characterized by including the steps that a regional stress field type is preliminarily predicted according to the regional structure evolution history and the modern structure movement characteristics; crossed tunnels with the basically same supporting type in the same stratum are selected for further judging and observing the regional stress field type; the maximum horizontal principal stress direction of the stress field at an observation site is judged according to the underground stress trace geometrical characteristics; through the combination of the stress field type and the maximum horizontal principal stress direction, the maximum principal stress direction, the intermediate principal stress direction and the minimum principal stress direction of the stress field are judged. By means of the method, the problems that an existing coal mine stress field testing method is high in engineering cost and complicated in process are solved; by means of the relations of tunnel deformation, stress trace characteristics, stress field type and principal stress direction, the economical, practical and effective underground coal mine stress field principal stress direction predicting method is put forward.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety, and relates to a method for predicting the principal stress direction of an underground stress field in a coal mine. [0002] technical background [0003] Safety in coal mine production is the most important issue. In order to solve the safety production of coal mines, the in-situ stress field test in the mine area is an essential basic work to prevent safety accidents. In the ground stress field test, according to the vertical stress σ of the ground stress test site v , the maximum horizontal principal stress σ H , the minimum horizontal principal stress σ h The relationship between the numerical values ​​of the three, the in-situ stress field is divided into σ H >σ v >σ h Type, σ H >σ h >σ v Type, σ v >σ H >σ h There are three types. Different mines may belong to different geostress field types due to different mining depths and regional geological movemen...

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Problems solved by technology

[0004] However, due to the complexity of the in-situ stress test process and the high cost of testing, in actual production, most coal mines have not carried out in-situ stress tests, and the engineering design of coal mine roadway layout and coal seam gas drainage lacks the necessary in-situ stress parameter guidance, resulting in Poor coal seam gas drainage effect and difficult roadway maintenance have left potential safety hazards for underground production in coal mines

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