Energy driven mechanism of surrounding rock deformation and failure of mining roadway and classified control technology

Abstract

Abstract The energy evolution of surrounding rock under mining influence has a crucial impact on its stability. Taking the I0104302 transportation roadway of Shuangma as the engineering background, the energy evolution law of surrounding rock in mining roadway was obtained by FLAC3D. The energy influence range and value of elastic energy and dissipated energy at both sides of the roadway gradually increase with the mining. The energy value at the face end reaches its maximum, with the dissipated energy release area forming a butterfly-shaped distribution and the elastic energy accumulation area forming a trapezoidal accumulation pattern. Subsequently, the surrounding rock of the roadway is divided into energy consumption zone, energy supply zone, and unaffected zone based on the range of two energies. Then, the types of surrounding rock deformation and failure are identified from two aspects: energy level K and energy release rate V. When K ≥ 1 and V ≥ 1, the surrounding rock of the roadway undergoes impact instability; when V < 1, the surrounding rock of the roadway undergoes large deformation failure. Furthermore, "Multi-Level pressure yielding" and "Relief-Support" control technology are proposed for the two types of failure, and field verification has been carried out in Shuangma and Xinjulong.