抽灌作用下止水帷幕应力应变研究

Analysis of the Stress and Strain of Waterproof Curtain under Dewatering and Recharging

摘要: 本文基于上海某基坑工程，利用有限元分析软件Abaqus建立了三维流固耦合模型，通过仿真结果分析了基坑降水及同时考虑基坑内抽水基坑外回灌作用下渗流场的变化情况以及止水帷幕的应力变化及变形规律。分析表明，在抽水及抽灌作用下，止水帷幕Mises应力大小随着止水帷幕埋置深度的增加逐渐增大。随着坑内降水的进行，止水帷幕整体的应力在逐渐增大，在抽水稳定后，止水帷幕的应力达到最大值。回灌井的作用使得止水帷幕所受应力逐渐变小，止水帷幕向基坑内侧的变形量减小。

Abstract: In this paper, a three-dimensional fluid-solid coupling model is established by finite element analy-sis software Abaqus based on a foundation pit project in Shanghai. Through the simulation results, the change of seepage field and the stress change and deformation law of waterproof curtain under the action of foundation pit dewatering and external recharge of pumping foundation pit are ana-lyzed. The analysis shows that the value of Mises stress of waterproof curtain increases gradually with the increase of the insertion depth of the waterproof curtain. The stress of the waterproof cur-tain increases gradually with dewatering. And when the pumping is stable, the stress of the water-proof curtain reaches its maximum value. The application of the recharging well makes the stress on the curtain gradually become smaller, and the deformation of the curtain to the inner side of the pit reduce.