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Underground coal mine stress field principal stress direction predicting method

A technology of stress direction and prediction method, applied in mining equipment, earthwork drilling, tunnels, etc., can solve the problems of complex in-situ stress field testing process, poor coal seam gas drainage effect, lack of in-situ stress parameters, etc. The effect of developing and forecasting methods is simple and effective, and has broad economic and social benefits

Inactive Publication Date: 2017-01-04
HENAN POLYTECHNIC UNIV
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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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  • Underground coal mine stress field principal stress direction predicting method
  • Underground coal mine stress field principal stress direction predicting method
  • Underground coal mine stress field principal stress direction predicting method

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Embodiment Construction

[0022] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings and specific conditions.

[0023] figure 1 It is a flowchart of the analytical method of the present invention, comprising the following steps:

[0024] S1: Preliminary prediction of the type of regional in-situ stress field: analyze the history of tectonic evolution in the region and the characteristics of current tectonic movement. When the regional geological movement is dominated by horizontal movement, the in-situ stress field is σ H >σ h >σ v type or σ H >σ v >σ h type; when the regional geological movement is dominated by uplift or subsidence, the type of in-situ stress field is σ v >σ H >σ h type;

[0025] S2: Select roadways (1) and roadways (2) that intersect with each other and have basically the same support type in the same rock formation, such as figure 2 shown.

[0026] When roadway 1 and roadway 2 are mai...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D21/00E21D9/00
CPCE21D9/00E21D21/00
Inventor 崔洪庆关金锋刘勇钟福平肖知国司小昆马志奇曹汉生蔡寒宇王永周李莹莹郭明
Owner HENAN POLYTECHNIC UNIV
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