清江水布垭枢纽地下厂房岩石力学研究

水布垭地下厂房岩石力学问题主要表现为复杂的岩体结构及软岩对洞室围岩的控制作用。针对水布垭地下厂房岩石力学问题开展了系统的岩石力学研究，包括地应力分布特征、岩石力学特性、工程岩体分级、岩体稳定与支护数值模拟、洞室围岩变形破坏特征、超载安全度以及洞室围岩开挖与支护措施等。结果表明：水布垭地下厂房洞室开挖在技术上是可行的；所采用的软岩处理、洞室围岩喷锚支护以及尾水管槽间留隔墩并加锚桩的综合处理措施是合理的，作用效果明显。并综述了主要相关内容的研究成果。

Rock Mechanical Study of Underground Powerhouse in Shuibuya Project

The key rock mechanical problems of the underground powerhouse in Shuibuya Project are the complicated rock structures and the control effect of soft rock on the surrounding rock of the grotto.In combination with the rock mechanical problems,a systematic research in different aspects of rock mechanics based on a carefully issued research scheme has been carried out,which includes the initial geo-stress distribution features,rock mechanical properties,engineering rock classifications by different methods,numerical modeling for stability and support analysis,safety margin for over-loading and failure features,proper measures for rock excavation and supporting,etc.The results show that rock excavations of the underground powerhouse for the given geological conditions can be achieved technically.Some measures,suggested by the designer,which mainly consist of the soft rock replacements by concrete in local area below the crane beam,the shotcrete and reinforcement by rock bolts and anchor cables in surrounding rock,resulting in a reinforced rock walls between the tailrace tubes,etc.,are proved to be reasonable and effective.This paper briefly presents some relevant results.