FLAC3D simulation of combined support effect under different prestress parameters of deep soft rock roadway

In coal mining, as the mining depth increases, a complex mechanical environment of “high ground stress”, temperature”, karst water pressure”, and “mining disturbance”, namely “three highs one disturbance” appears. Many roadways have characteristics soft rock with large deformation, pressure, difficult support, high support cost, which brings severe challenges to safe efficient production mines. Therefore, it is very important explore technology parameters deep roadways. this paper, numerical simulation used study influence different prestress on displacement, axial force vertical stress surrounding roadway in joint roadway. The results show that prestressing 20KN, 40KN, 60KN, supporting method bolt anchor cable combined comprehensive effect 60KN prestressed + best.