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When water to be drained and dropping head o f foundation delve are small, filter persion, duct persion, well draining an d blind ditch persion can be adopted.

在工程建设中,降低地下水位辅助施工的方法很多,当基坑降水量及降水深度不大时,可采用反滤层导流、导管导流、机井排流、盲沟导流这几种简易方法。