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

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

FLAC^3D simulation of combined support effect under different prestress parameters of deep soft rock roadway