Study on Development Characteristics and Control of Surrounding Rock Fracture in Deep High Stress Roadway

Abstract

In order to study the fracture development characteristics of surrounding rock in deep high stress roadway, taking the track crossheading of 5307 working face in Anju Coal Mine of Jining Mining Group as the engineering background, the PFC <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2D</sup> numerical model is established, and the development characteristics of surrounding rock fracture of roadway under different lateral pressure coefficients are obtained. With the increase of lateral pressure coefficient, the fracture development degree of surrounding rock of roadway increases gradually. When the lateral pressure coefficient increases from 0.6 to 1.5, the number of cracks increases from 817 to 2148, and the length increases from 200 mm to 403 mm. The total number and length of cracks in roadway surrounding rock increase linearly with the lateral pressure coefficient, and the deformation of roadway increases gradually. According to the simulation results, the support scheme of the track roadway of 5307 working face is optimized, that is, the combined support of high pre-stressed yielding bolt + high pre-stressed anchor cable + metal mesh, and the engineering application is carried out. The engineering practice shows that the maximum deformation of the roof and floor of the roadway is 52 mm, the maximum deformation of the two sides is 78 mm, and the surrounding rock of the roadway is effectively controlled.