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三峡工程一期土石围堰采用柔性材料防渗墙上接土工合成材料为防渗基本方案。为监测防渗墙的工作状态，设计布置了３个监测断面，埋设了无应力计和应变计，监测防渗墙的应力应变。监测成果表明，所埋仪器有效地监测了防渗墙的运行，防渗墙是安全的。通过一期土石围堰防渗墙的安全监测的实施，为二期深水围堰防渗墙安全监测的设计及仪器的埋设安装积累了经验，提供了科学的依据
The first phase of the Three Gorges Project earth rock cofferdam using flexible material cut-off wall on the earthwork synthetic materials as the basic plan impermeable. In order to monitor the working condition of the cut-off wall, three monitoring sections are designed and arranged, and a stress-free meter and a strain gauge are buried to monitor the stress and strain of the cut-off wall. Monitoring results show that buried instruments effectively monitor the operation of cut-off walls and cut-off walls are safe. Through the implementation of the safety monitoring of the impervious wall of the first-stage earth-rock cofferdam, it has provided the scientific basis for the design of the safety monitoring of the seepage-proof wall of the second-stage deepwater cofferdam and the installation and installation of the instrument