Stress field evolution mechanism and regional stress control technology of deep mining roadway

Abstract

Aiming at the problem that the distance between the main roadway and the working face in Hudi Coal Industry Panel was more than 100 m, which was still affected by mining, high stress concentration of the roadway, and difficulty of supporting overall convergence of the section, the mechanical characteristics of the core bearing strata of the overlying rock caving in the working face were studied. The correlation mechanism between the overlying rock caving and the deformation and failure of the roadway was analyzed, and the quantitative evaluation index was established to comprehensively analyze different influencing factors. Based on the key strata theory, the mechanical difference transfer model of working face mining and panel roadway deformation and failure was established. It was considered that the difference in fracture morphology was the key to the far-field stress disturbance. The regional stress control technology was proposed to block or reduce the stress transfer, so that the peak stress of the panel main roadway was reduced, and the deformation of the surrounding rock was significantly reduced, which provides a reference value for the roadway support with serious influence of mining roadway.

Keywords

spatial structural instability of overburden rock / differentiated stress concentration body / regional stress control / roof cutting and pressure relief / mining stress transmission and action

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Central South University