Abstract:
In order to solve the support problems of large cross-section roadway near fault, aiming at the phenomena of severe roof subsidence, asymmetric deformation of two sides and failure of supporting structure in 53121 roadway of Zhaozhuang coal mine near fault, Jincheng city, Shanxi province, the characteristics and causes of deformation and failure of roadway near fault are analyzed through field investigation and numerical simulation.The results show that shear slip failure of fault plane, soft and fractured surrounding rock and poor pertinence of support structure are the causes of deformation and failure of large cross-section roadway.Based on the principle of asymmetric support, the control technology of surrounding rock of this roadway is put forward, that is, the roof of large cross-section roadway is controlled by full anchor cable support, and the asymmetric support technology of bolt and cable is used to control the asymmetric deformation of two sides of large cross-section roadway, so as to promote the uniform bearing of support structure and control the deformation of surrounding rock of roadway.Engineering practice shows that the deformation of surrounding rock is effectively controlled and the stability of roadway is greatly improved after the new support scheme is adopted.