Variability Characteristics Simulation of Roadway Plastic Zone in Different Side Pressure Coefficients

Side pressure coefficient has a greater impact on the stability of roadway surrounding rock, the shape and scope of plastic zone of roadway surrounding rock is different in different side pressure coefficients. Applying the method of numerical simulation, plastic zone distribution characteristics of roadway were analyzed with different side pressure coefficient under the condition of buried depth 400 m and 800 m, and the corresponding support countermeasure of roadway was proposed. The simulation results show that: when λ=1, plastic zone of roadway surrounding rock was circular; when λ>1, plastic zone of roadway surrounding rock was vertical ellipse; when λ<1, plastic zone of roadway surrounding rock was transverse ellipse; when λ>1, roadway support should give priority to control the roof and floor mainly; when λ<1, roadway support should give priority to control the side wall mainly. When the greater depth of roadway surrounding rock plastic zone is larger in the same side pressure coefficient, but the growth rate is non-linear relationship with buried depth.