深基坑坑外降水引起土体沉降的有限元分析

FEM analysis of settlement caused by dewatering in deep excavation

深基坑开挖中的降水会引起周围土体沉降。为预测基坑开挖及降水过程中周围土体的沉降,本文采用基于比奥固结理论的有限单元法在大型有限元软件中建立轴对称模型进行了分析。结果表明:该方法可以反映抽水引起的孔隙水压力变化及土体沉降变化规律,是一种实用可行的方法。

Dewatering in deep excavation will cause settlement of surrounding soils. To predict the settlement of surrounding soils during excavation, axisymmetric model was established in FEM software to analyze the problem by use of FEM based on the Biot＇s consolidation theory. Results show that the method can properly reflect the characteristics of change of pore pressures and soil settlements, and it is practical and feasible.