Abstract: Continuous deformation, support structure damage and large scale collapse are always found with the chlorite schist because of its characteristics of low strength, elastic modulus and water-weakening impact. For the diversion tunnel No.1 of Jinping Ⅱ hydropower station, monitoring of surrounding rock deformation, stress-strain on the support and lining structure as well as external water pressure on the lining structure was carried out. Based on analysis of monitoring data, the working behavior of the chlorite schist tunnel section was understood to evaluate the safety of the diversion tunnel No.1 and provide reference to similar projects.

Key words: diversion tunnel, chlorite schist, safety monitoring, analysis

摘要： 绿泥石片岩具有强度及弹性模量等力学参数较低、遇水软化效应明显的特点，易出现围岩持续变形、支护结构损坏、大规模塌方等破坏情况。通过对锦屏二级水电站1号引水隧洞绿泥石片岩洞段围岩变形、支护和衬砌结构应力应变及衬砌外水压力监测成果的初步分析，了解该洞段的工作状态，为1号引水隧洞的安全评价提供科学依据，为类似工程提供参考。

关键词: 引水隧洞, 绿泥石片岩, 安全监测, 分析