中文摘要：

锦屏一级、猴子岩等大型水电工程地下洞室群的施工过程中出现岩爆、塌方、大变形及支护后喷层、围岩开裂等围岩变形破坏现象,对围岩变形失稳模式及针对性的调控措施缺乏系统、总结性的研究。在收集大岗山、锦屏一级、猴子岩、官地等多个典型水电工程地下洞室群施工地质、设计、物探、监测资料及现场调查的基础上,从控制因素上将围岩失稳模式分为岩体结构控制型重力驱动型、应力驱动型、复合驱动型3种类型;从破坏主要发生的工程部位将破坏模式归纳为5个部位、16种基础模式;以猴子岩水电工程主厂房动态调控为实例,说明所提出的调控措施的有效性和可行性。该研究成果可为大型地下洞室动态设计提供借鉴,为施工安全的保障提供理论依据,具有重要的工程意义。

英文摘要：

Rockburst,collapse,large deformation of shotcrete layers after support,rock cracks and other damage phenomena appeared in the underground caverns of Jinping I,Houziyan and other large hydropower projects during construction. Systematic researches have seldom been performed on the deformation and instability modes of surrounding rock and the controlling measures. Based on the collected geological and design data,the geophysical surveying,the monitored data and the field investigation in underground caverns of Dagangshan,1st stage of Jinping,Houziyan,Guandi and other typical hydropower projects during construction,the failures of surrounding rock are divided into 3 modes：the rock structure controlled and gravity-driven mode;the stress-driven mode and the mixed mode according the controlling factors. The failure modes can also be divided into 16 basic modes according to the main project sites where instability occurs in 5 areas of the caverns. The proposed controlling measures were used in Houziyan project to show their feasibility and effectiveness.