三峡工程二期围堰防渗墙工作性状的验证分析

Examination of Behavior of Cut-off Wall of Large Earth-Rock Cofferdams of TGP

三峡工程二期上游深水高土石围堰工程复杂,实际运行中经受住了1998年汛期8次大洪水的考验.防渗墙是围堰工程的关键部位,其实际工作性状如何对围堰工程的安全性至关重要.该文结合二期上游围堰拆除过程中进行的调查实录、取样和相关参数测试工作,对围堰工程中防渗墙的工作性状进行了验证分析,对进一步总结二期围堰的成功经验将起到重要作用,同时对类似工程的设计与施工也具有重要的指导作用.

The second phase large earth-rock cofferdams of TGP are the complicated sub-project during construction. The cofferdams experienced 8 times dangerous floods of the Yangtze River successfully in 1998. The cut-off wall is the important key part of a cofferdam. The behaviors of the cut-off wall influence the safety of the cofferdam directly. In the paper, combining the investigating, sampling, and parameters testing works in the removal process of the second phase up-stream earth-rock cofferdam, the examination into the behaviors of the cut-off wall of the cofferdam has been performed. The results of the paper will play an important role in further summarizing successful experiences of construction of second phase cofferdams of TGP so as to guide the design and construction works of a cofferdam for same kind of projects.