高承压水软土地层深基坑降水试验分析

Analysisof dewatering test for deep foundation pit in high confined water soft ground

某深基坑位于福州城区且临近地铁及旧有建筑,在土方开挖前,进行了基坑降水试验。通过降水试验,检验止水帷幕的止水效果及降水方案的可行性。试验结果表明,降水过程中,坑外的承压水水位变化较小,止水帷幕的隔水效果良好;获取的试验数据为优化基坑降水方案、基坑开挖降水井及回灌井的启用条件分析提供了可靠的依据,也可对类似岩土工程条件深基坑工程降水设计具有借鉴意义。

Dewatering test of a deep foundation pit in Fuzhou urban core area and near the subway and existing buildings is carried out before the earthwork is officially excavated,in order to ensure the safety of foundation pit.The water sealing effect of Waterproof curtain and the feasible of dewatering scheme were testified through the dewatering test.The results of the dewatering test show that the confined water lever changes rather small and the water sealing effect of Waterproof curtain works well during the dewatering process.The obtained test data can provide reliable evidence to optimize dewatering scheme of the foundation pit and to analysis the application requirements of the dewatering well and recharge well.This paper can provide some reference for similar dewatering design of deep foundation pit in the future.