Abstract: As the influence of high geostress and high external water pressure, the deformation of surrounding rock and stress distribution of supporting structure are the concerns of deep-buried, long and large hydraulic tunnel. Safety monitoring is an important way to guide design and construction and to know the safety status of the project. However, the uncertainty of deep-buried, long and large hydraulic tunnel brings great difficulty to safety monitoring. Through the engineering practice of the safety monitoring of the hydraulic tunnel in Jinping Ⅱhydropower station, the deformation of different types of surrounding rock and the stress characteristics of the supporting structure in deep buried condition are introduced in this paper. From the perspective of deformation, seepage and stress, the key technologies of safety monitoring for deep-buried tunnel are thoroughly analyzed, and the experience of instrument installation is summarized, for reference.

Key words: safety monitoring, hydraulic tunnel, deep-buried, Jinping Ⅱhydropower station

摘要： 深埋长大水工隧洞在高地应力、高外水压力等因素的影响下，围岩变形及支护结构受力情况是工程中关心的问题。安全监测是指导设计与施工、了解工程安全状况的重要手段，深埋长大水工隧洞的不确定性给安全监测带来极大的困难。通过锦屏二级水工隧洞安全监测的工程实践，介绍了深埋条件下不同围岩类别的变形及支护结构受力特点，从变形、渗流、应力等角度深入分析了深埋隧洞安全监测中的关键技术，总结了仪器设备埋设的经验，为类似工程提供了参考。

关键词: 安全监测, 水工隧洞, 深埋, 锦屏二级水电站