由于紫坪铺水利枢纽工程#2导流洞进口强卸荷风化围岩软弱破碎、稳定性差,因此探讨其内部围岩在开挖扰动影响下的变形特征,合理确定围岩强度力学参数对工程设计和施工有一定的指导作用.以导流洞进口强卸荷风化带围岩内部位移观测资料为基础,分析了围岩内部的变形规律,并根据此观测资料,对强卸荷风化带围岩进行了强度力学参数仿真反演分析,提出了该段围岩较合理的宏观强度力学参数,为支护结构的设计和施工提供参考. Due to weak weakening and weak stability of the strong unloading weathered surrounding rock in the inlet of the # 2 diversion tunnel in Zipingpu Water Conservancy Project, the deformation characteristics of the surrounding rock under the influence of excavation disturbances are discussed and the mechanical parameters of the surrounding rock strength are reasonably determined. Design and construction.According to the observation data of the internal displacement of the strong unloading and weathered belt in the diversion tunnel, the deformation rules of the surrounding rock are analyzed. Based on this observation data, Rock strength mechanical parameters of the simulation inversion analysis, put forward a more reasonable macroscopic strength of the surrounding rock mechanical parameters for the support structure design and construction provide a reference.