南水北调中线渠道强透水基础抗浮处理措施

Design of anti-floating to Channel of the Middle Route of South-to-North Water Diversion Project with Strong Pervious Foundation

南水北调中线工程黄河北至菱河北渠道工程线路长，地质条件复杂，渠道沿线穿越强透水砂卵石地层占渠段总长约1／3，渠道外地下水的渗流扬压力较大时可对总干渠产生顶托破坏，严重威胁总干渠的安全运行。针对南水北调中线总干渠强透水地基渠道的特点，综合各方面因素，确定了适用于总干渠渠道的排压结合、永临结合抗浮处理方案。

The channel of the Middle Route of South-to-North Water Diversion Project between the Yellow River and You River is very long, the geological conditions are so complex, the channel on the Strong Pervious sand and gravel accounted for a total length of about 1/3. When uplift pressure produced by Groundwater Seepage Flow becomes large enough, the channel could be damaged, and the safety operation of the diversion channel will be threated seriously. According to the characteristics of the main channel of South-to-North Water Diversion Project with strong pervious foundation, we identified the design of anti-floating, which is suitable for the South-to-North Water Diversion Project, include the Drainage and Pressure Lowering scheme, the counterweight scheme.permanent and temporary scheme.