三仙湖水库下坝调节泵站工程桩基优化设计分析

Analysis on Optimal Design of Pile Foundation of Sanxianhu Reservoir Regulation Pumping Station Project

三仙湖水库下坝调节泵站桩基工程原设计采用钻孔灌注桩施工方案,但在施工过程中多次出现流沙现象,严重影响施工进度和施工安全。为在计划工期内完成泵站地基加固,提出水泥粉喷桩和PHC管桩两种优化设计方案,并从工程量、安全性、工程造价和工期等多个方面进行对比分析,最终确定采用桩径为400 mm的PHC管桩对泵站工程地基进行加固施工。

The original design of the pile foundation project of Sanxianhu reservoir lower dam regulating pump station adopted the construction scheme of bored pile,but the quicksand phenomenon occurred many times in the construction process,which seriously affected the construction progress and safety.In order to complete the foundation reinforcement of the pump station within the planned period,two optimization design schemes of cement powder spraying pile and PHC pipe pile were put forward.The project cost and construction period are compared and analyzed,and the PHC pipe pile with pile diameter of 400 mm is finally adopted to reinforce the foundation of the pumping station project.