关键词: 安全监测, 水工隧洞, 深埋, 锦屏二级水电站

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