Abstract
The mining of coal seam has a significant influence on the stability of the roadway near it, especially under the condition of high ground stress. To study the control mechanism of the surrounding rock under the influence of high ground stress, a general idea for the partition control of the rebuilding bearing arch (RBA) was proposed in this paper. Based on the basic mechanical performance test of the bearing arch, this paper built a mechanical model of the RBA based on Protodyakonov’s pressure arch theory, analyzed the influence of the strength of the bearing arch on the surrounding rock failure, and obtained the ultimate thickness of the bearing arch failure under high ground stress. The results show that the RBA’s damage is closely related to the overburden load and RBA’s thickness. The tensile stress and shear stress of RBA increase linearly with the overburden load increase and increase sharply with the load-bearing arch’s thickness, showing a nonlinear relationship. To maintain the surrounding rock’s stability, it is necessary to ensure that the RBA’s thickness is within a specific range. The results are applied to the Wantian coal mine. The theoretically determined load-bearing thickness is 10 m, which can effectively control the surrounding rock deformation and significantly reduce the roadway’s repair rate.
Highlights
Academic Editor: Xianjie Hao e mining of coal seam has a significant influence on the stability of the roadway near it, especially under the condition of high ground stress
For roadways affected by high ground stress, proper grouting to save material costs while ensuring the grouting effect and improving the surrounding rock’s self-carrying capacity has become an urgent problem in controlling the roadway’s surrounding rock [6, 7]. erefore, it has important theoretical significance and engineering practical value to study the control mechanism of rebuilding bearing arch (RBA) of the surrounding rock affected by high ground stress
Tian and Gao [11] established a mechanical model of adjacent rock strength, mining stress, and supporting resistance based on an elastic-plastic theory of mechanics, and they obtained an analytical solution for stress and displacement distribution of elastic and plastic regions in surrounding rock of dynamic pressure roadway
Summary
2.1. e Condition of the Roadway Studied. is paper is based on the engineering background of the crossheading 1433 restoration project of Wantian coal mine, Panzhou city, Guizhou Province, China. E severe floor heave section reached 2.7 m in 3 quarters, and the local roof subsidence reached 1.0 m, which seriously affected the normal production of the mine It could not meet the regular transportation and ventilation requirements of the roadway. During the mining period of 11502 working face in the upper part of crossheading 1433, roof subsidence and floor heave occurred in the surrounding rock of roadway. During the mining period of the upper 11502 working face, the roof subsidence and floor heave occurred in crossheading 1433 surrounding rock. During the monitoring period of 20–30 days, under the influence of heavy mining, the anchor cable bolt’s bearing capacity increases, and the maximum bearing capacity of the bolt is 66 kN. It is imperative to improve the structure and mechanical properties of surrounding rock
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