坑中坑对软土基坑变形影响的有限元分析

Numerical analysis for the Deformation of soft soil Pit in Excavation

以福州某设有坑中坑的软土深基坑工程为研究对象,采用土工有限元分析技术,考虑桩土相互作用,建立基坑开挖模型,土体采用HS模型模拟,分析围护桩水平位移变化特性,研究坑中坑开挖对外坑基坑变形的影响。通过与实际监测资料的对比分析,表明了坑中坑的存在对外坑围护结构的变形有很大影响,数值模拟计算方法在坑中坑工程中有良好适用性,对于类似工程具有指导意义。

Based on a deep foundation pit of sluice in Fuzhou to study the deformation properties in pit- in- pit. The geotechnical finite element numerical analysis software is used to simulate the process of excavation. Considering the soil behavior and the interaction between piles and soils and Hardening- Soil model are adopted,the excavation model is set up. The behaviors of deflection of retaining structure of the outer- pit are studied detailedly. By comparing analysis with the measured data,this study shows that the the internal pit have a great influence on deformation of retaining structure,and numerical simulation method has a good applicability in the pit- pit engineering,This project also dose instucting good to the parallels.