Accurate control method for surrounding rock of coal mine tunnel crossing fault area

Abstract

The invention discloses an accurate control method for surrounding rock of a coal mine tunnel crossing fault area, which comprises the following steps of: (1) carrying out ground stress inversion on afault damage area to determine a ground stress distribution rule of the tunnel crossing fault area; (2) taking mudstone of the surrounding rock fault zone of the roadway, carrying out a remolding test, and determining the physical and mechanical properties of the surrounding rock by adopting a geological strength index (GSI) method; (3) adopting a discrete element simulation method to preferablyselect a fault zone surrounding rock control scheme, and determining a precise surrounding rock control method for a fracture zone of the coal mine tunnel crossing fault ; and (4) observing the mine pressure of the roadway surrounding rock. Aiming at the characteristics of quick rock stratum lithology change and rock stratum crushing of a fault fracture zone, the stress distribution rule and the surrounding rock type of the roadway are mastered through geomechanics and a numerical simulation method, and accurate control over the surrounding rock of the roadway is achieved.

Description

technical field [0001] The invention belongs to the technical field of surrounding rock control of coal mine roadway, and in particular relates to a method for precisely controlling surrounding rock of coal mine roadway crossing a fault zone. Background technique [0002] With the increase of coal mining intensity, mines in eastern my country have gradually entered complex and difficult-to-mine areas. In these areas, faults are developed, or the original development system needs to be extended to enter a new mining level. Crossing fault fracture zones is a common phenomenon. . For example, the third level of Jiulishan Coal Mine crosses the Mafangquan fault zone, Yanzhou Xinyi Coal Mine crosses the five major faults of Changgou Branch, the second level of the Chengjiao Coal Mine of Yongmei Company, the west wing main road, and the -400m main road of Fangzhuang No. 1 Coal Mine, etc. The lithology of the rock strata in the fault zone is changeable, generally relatively broken, ...

AI Technical Summary

Problems solved by technology

[0003] In view of the weak surrounding rock of the roadway passing through the fault fracture zone, the mudification is serious, and it is impossible to drill cores for standard rock mechanics tests, resulting in ambiguous engineering geological conditions; The support form is generally an active support method such as anchor rod + anchor cable + net + grouting or a combined support method such as a closed support, which is not sensitive to stratum changes, resulting in too high or low support strength, which cannot be well adapted Changes in the surrounding rock of the fault zone

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