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本文阐述了有限元分析软件PLAXIS中小应变土体硬化模型的理论依据,并探讨了其计算参数的选取方法。结合上海地区地铁车站深基坑工程项目,分别采用HS模型及HSS模型进行了有限元模拟分析,并将模拟结果与实测监测数据进行对比,计算对比表明,HSS模型分析结果较HS模型而言,在围护墙的变形及墙后地表沉降等方面都更符合实际情况,验证了HSS模型较常用的本构模型而言更适用于模拟上海地区城市深基坑开挖问题。
This paper describes the theoretical basis of finite element analysis software PLAXIS model of soil hardening in small strain and discusses the selection method of its calculation parameters. Combined with the deep foundation pit project of Shanghai metro station, the HS model and HSS model are respectively used for the finite element simulation analysis, and the simulation results are compared with the measured monitoring data. Comparing the results shows that the HSS model analysis results compared with the HS model, The deformation of the retaining wall and the settlement of the ground behind the wall are more in line with the actual situation. It is verified that the HSS model is more suitable for simulating the excavation of deep foundation pit in urban areas in Shanghai than the constitutive model.