乌江洪家渡水电站泄洪系统岩溶发育特征分析与施工处理措施

Analysis of karst - developing characters of flood discharge system of Hongjiadu ,hydropower station and summarization of treatment measures

本文对洪家渡水电站泄洪洞、溢洪道开挖所揭露的岩溶分布情况和特征进行论述，将工程的处理措施加以总结，为今后永久洞室岩溶发育段开挖处理提供参考。

The intake of flood discharge system of Hongjiadu hydropower station is located in the elbow area on the left bank, where the stratum is Yongningzhen limestone （Tlynl -5, Tlynl -4） and the stratum outcrop of the outlet is limestone（Tly2-4, Tly2- 3） and dolomitic limestone, and there is well developed karst, so the construction safety and long - term stability of permanent chambers of flood discharge system are strongly impacted on. The paper analyzes karst - developing characters and formation cause of the two permanent chambers on the basis of the statistics of the karst distribution revealed in the excavation of the two permanent chambers of the spillway and discharge tunnel, and summarizes treatment measures and countermeasures during construction, so as to provide reference for excavation of karstdeveloping sections of permanent chamber in the future.