Numerical Simulation and Verification of Water Inflow Calculation of Hanging Water-stop Curtain
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摘要: 在基坑工程中，为合理保护地下水资源和节约工程成本，悬挂式止水帷幕在工程中的应用越来越广泛。为更好地研究悬挂式止水帷幕基坑涌水量及影响半径的影响范围，依托北京市东城区第一人民医院基坑项目，进行了悬挂式止水帷幕基坑涌水量的数值模拟，并现场进行数据监测，从而对数值计算结果进行验证。结果表明：（1）利用有限元数值模拟软件分析的基坑内涌水量与实际监测的数值趋势相同，日涌水量可以达到1970 m3；（2）设置悬挂式止水帷幕的基坑，原基坑降水影响半径不再适用，降水影响半径比原来有所减小；（3）随着距离止水帷幕距离的增加，基坑外水头值越来越大；随着距离止水帷幕距离的越来越大，基坑外水头值增加的趋势越来越小。Abstract: In the foundation pit project, in order to reasonably protect the groundwater resources and save the project cost, the hanging water-stop curtain is more and more widely used in projects. In order to study the amount of water influx and the influence range of the impact radius of the hanging water-stop curtain pit, the foundation pit project of the First People’s Hospital of Dongcheng District is analyzed. The numerical simulation of the water inflow amount of the hanging water-stop curtain pit is carried out, and monitoring data is acquired to verify the numerical calculation results. The results show that: (1) the amount of water inflow in the foundation pit analyzed by the finite element numerical simulation software is the same as the actual monitored numerical trend, and the daily amount of water inflow could reach 1970 m3; (2) the foundation pit with hanging water-stop curtain is set up, and the original influence radius of foundation pit dewatering is no longer applicable, and the influence radius of dewatering is reduced compared with the original; (3) as the distance from the water-stop curtain increases, the head value outside the foundation pit becomes larger and larger; as the distance from the water-stop curtain increases, the trend of the increasing head value outside the foundation pit is getting smaller and smaller.
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