Study on numerical simulation of stress transfer law of isolated working face in top and bottom plate

Aiming at the serious damage caused by the stress concentration in the isolated working face for a long time in the underground transportation roadway, the mining treatment of the isolated working face is carried out to reduce its influence on the stress concentration of the surrounding rock of the roadway.This paper compares and analyzes the stress transfer law of roof and floor of isolated working face before and after mining, and probes into the law of roof supporting pressure of isolated working face and the vertical distance between underlying transportation roadway and isolated working face floor by numerical simulation.It found that with the increase of the distance from the floor to the floor, the stress concentration of the surrounding rock of the roadway shows a decreasing trend.When the isolated island face is mined, the stress of the floor is obviously released.The stress concentration factor of surrounding rock of floor roadway is reduced by 52%~60%, and the shear failure of surrounding rock of floor roadway presents X failure, which provides theoretical basis for the optimization of surrounding rock support in subsequent roadway.