高承压水条件下地铁深基坑减压降水研究

Pressure Reduction Dewatering in Deep Foundation Pit of Subway under High Confined Water

为降低高承压水深基坑工程的突涌风险,在某地铁深基坑换乘站建设过程中,通过现场抽水试验及沉降监测,借助数值模拟为基坑减压降水进行方案优化。获取了承压含水层的水文地质参数,分析预测了三维渗流场及周边沉降的时空分布规律,提出了合理的降水优化方案,对类似工程具有借鉴意义。

To reduce the bursting risk of deep excavation engineering under high confined water during the con- struction of a subway transfer station, an optimization scheme was provided based on the field pumping tests and subsidence monitoring with the aid of numerical simulation. Through the analysis in the paper, the hydroge- ology parameters for the confined aquifer were defined, then the 3D seepage field and the space-time settlement distribution of the surrounding were forecasted, and the reasonable optimization dewatering scheme was put for- ward. This research provides reference for similar projects.