双屈服面模型用于软土地区轨交车站基坑开挖效应计算的分析

Analysis on Use of Double Yield Surface Electroplastic Model in the Calculation of Foundation Pit Excavation Effect of Rail Transit Stations in Soft Soil Area

在适合上海软土特性的弹塑性本构模型的基础上,以三轴试验数据为基础,对双屈服面模型的参数进行了研究,并应用改进后的有限元计算程序对上海轨交车站基坑工程进行计算,重点关注了基坑底部隆起以及地下连续墙的水平变形。对比数值模拟结果和监测数据,反映出本计算方法的有效性,对同类工程的设计施工具有一定的参考价值。

On the basis of the electroplastic constitutive model suitable for the characteristics of soft soil in Shanghai,this article studies the parameters of the double yield surface model based on triaxial test data,and applies the modified finite element calculation program to calculate the foundation engineering of rail transit stations in Shanghai and pay particular attention to bottom heave of foundation pits and horizontal deformation of underground continuous walls.Through comparison between numerical simulation results and monitoring data,the effectiveness of this calculation method is highlighted,which offers certain reference value to design and construction of similar projects.