考虑流固耦合作用的深基坑有限元分析

基于比奥固结理论和修正剑桥模型,利用流固耦合模型对复杂地质条件下深基坑降水开挖过程中基坑的时间效应进行研究,并以地铁车站深基坑为例,对基坑降水开挖过程中的渗流固结进行了有限元计算。计算结果揭示了基坑渗流场分布及基坑水土压力和地下连续墙变形、周围地面沉降及基坑底部回弹的分布规律;并将计算结果与现场实测数据进行了对比,发现考虑流固耦合的计算结果与实测数据较为接近,能够比较真实地反映基坑渗流与变形特征。

Numerical Analysis of Excavation Considering the Coupling of Seepage Field and Stress Field

Using coupling model,the time-effect behavior of deep excavating and dewatering pit in complex geological conditions is studied on basis of Biot consolidation theory and modified Cam-clay constitutive model.Taking the deep foundation pit project of one station as engineering background,the coupling of seepage and consolidation is simulated in the process of excavation.The simulation results show distribution laws of the seepage,deformation of concrete diaphragm wall,ground settlement surrounding the foundation pit and the pit bottom heaving;according to the comparative analysis between the simulation value and the measured results,it can be known that the calculation value considering the coupling of seepage and consolidation is well in accordance with the measured value,and the above analysis method can really reflect the seepage and deformation of foundation pit.