糯扎渡水电站左岸厂房区地下洞室群围岩稳定性研究

糯扎渡水电站的地下厂房位于左岸，工程规模巨大，地质条件复杂。通过对厂房区地下洞室群的工程地质条件进行分析，以确定地下洞室群的围岩类别，预测洞室开挖后的应力应变情况，评价洞室群围岩稳定性，从而为洞室群的位置选定及支护形式设计提供依据，并为确定施工程序和施工方法提供参考。

Study on the stability of surrounding rocks of the underground chamber group for the left-bank powerhouse of Nuozhadu Hydropower Station

The underground powerhouse of Nuozhadu hydropower project is located in the left bank, with huge underground chambers and complex geological conditions. It is important to adequately analyze and evaluate the stability of surrounding rock of the underground chamber group, and to provide the basis for the selection of their locations and the design of support types, and make reference for the solution of construction procedures and methods. This paper tries to analyze the engineering geological conditions of the underground chamber group, determines the surrounding rock classifications, and forecasts the stress variation after excavation, and evaluates the stability of surrounding rock of the chamber group.