关键词: 深部巷道, 大变形, 围岩控制, 数值模拟

Abstract: The large deformation of deep soft rock roadway is always a difficult problem in support, and the stress environment is complicated due to the influence of tunneling and mining. In this paper, aiming at the large deformation problem of track dark inclined shaft in Xinyuan coal mine, the UDEC numerical model is established, and the parameters of the model are corrected by the laboratory test results and GSI method. In order to reveal the failure mechanism and deformation of roadway, the index of "stress weakening coefficient" is proposed to invert the deformation and fracture distribution characteristics of surrounding rock. The results show that shear fractures first appear at the corner and bottom of the roadway, then develop deep, tensile fractures appear behind shear fractures, and distribute in the shallow area of surrounding rock. The floor fractures are highly developed and seriously deformed. The combined support scheme of "full anchor cable + reverse bottom arch + net shotcrete" is proposed. The engineering application results indicate that the optimized supporting scheme can greatly improve the whole bearing capacity of surrounding rock and effectively control the deformation of roadway, which provides a useful reference for similar deep soft rock roadway support design.