基于旁压试验土体弹塑性本构模型初探

发布时间：2018-02-28 15:35

本文关键词： 旁压试验 SMP屈服准则 Rowe法则弹塑性本构关系　出处：《岩土力学》2015年S1期 　论文类型：期刊论文

【摘要】：在大量旁压试验数据分析的基础上,通过曲线拟合,建立了旁压试验弹塑性阶段曲线的椭圆方程,利用土体SMP屈服准则和Rowe流动法则,推导出土体塑性阶段应力增量与应变增量间关系矩阵。在弹性阶段,假设土体应力-应变服从广义虎克定律,建立了基于旁压试验的土体弹塑性本构模型。编制了相应的计算程序,将文中模型计算结果与实际旁压试验曲线进行对比,初步验证了模型的正确性。将本构模型编译为ABAQUS自定义材料子程序UMAT,通过有限元对比分析,文中模型计算变形较弹性模型小,较摩尔-库仑模型大,与模型建立的假设一致。基于旁压试验的土体弹塑性本构模型参数少,且易于获取,便于在实际工程中应用。
[Abstract]:Based on the analysis of a large number of pressure-pressure-test data, the elliptic equation of the elastic-plastic stage curve of the pressure-pressure-test is established through curve fitting, and the SMP yield criterion and Rowe flow rule of soil are used. The matrix of the relationship between stress increment and strain increment in plastic stage of soil is derived. In elastic stage, the stress-strain of soil is assumed to be based on generalized Hook's law. A soil elastoplastic constitutive model based on pressure-pressure-test is established, and the corresponding calculation program is worked out. The calculated results of the model are compared with the actual pressure-test curve. The constitutive model is compiled into ABAQUS custom material subroutine Umatt. The finite element analysis shows that the deformation of the model is smaller than that of elastic model and larger than that of Mohr-Coulomb model. The soil elastoplastic constitutive model based on the pressure-pressure test has few parameters and is easy to be obtained, so it is easy to be applied in practical engineering.
【作者单位】：上海岩土工程勘察设计研究院有限公司;
【基金】：上海市科学技术委员会资助项目(No.10231203500,No.09dz1207705)
【分类号】：TU43

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