软土地区含承压水层深基坑抽降水设计及模拟分析

Design and simulation analysis of dewatering in deep foundation pit of confined aquifer in soft soil area

承压水是基坑地下水防治的一个重要难题,为了保护软土地区含承压水层深基坑开挖周边环境,目前常采用抽灌一体化的施工方法。以中交集团上海超高层总部基地项目为依托,基于抽灌一体化设计理念,通过三维渗流数值模拟和现场试验数据分析,对承压水减压降水设计进行优化,最终解决了基坑承压水防治和周边环境保护难题。结果表明,优化后的抽灌一体化设计方案在保证顺利降水的同时还可以有效控制基坑周边历史保护建筑的沉降速率,确保保护建筑的安全,证明了抽灌一体化设计的合理性,可为同类工程提供借鉴。

Confined water is an important problem in the control of groundwater in foundation pit.In order to protect the surrounding environment of deep excavation in confined aquifer in soft soil area,the construction method of pumping and irrigation integration is often adopted.Based on the integration of pumping and irrigation,the confined water dewatering design was optimized through 3D numerical simulation and field test data analysis,and finally the problems of confined water prevention and control of foundation pit and surrounding environment protection were solved.The results show that the optimized integrated design scheme of pumping and irrigation can effectively control the settlement rate of historical protected buildings around the foundation pit while ensuring smooth precipitation,and ensure the safety of protected buildings,which proves the rationality of the integrated design of pumping and irrigation,and can provide reference for similar projects.