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分级单屈服面(HISS)模型的屈服面是单一光滑的函数,解决了“帽子”模型存在的数学不完备问题。该文介绍了HISS模型中非关联流动法则各向同性硬化的1?模型及其主要参数对屈服面的影响,使用MATLAB对一个高斯积分点进行加载试验,观测了在加载过程中应力路径及屈服面的变化;基于ABAQUS有限元程序提供的二次开发平台,首次编写了土体HISS模型的三维用户材料子程序。使用ABAQUS外接该文开发的用户子程序模拟了Leighton Buzzard砂土的4种三轴试验算例(静水压试验、常规三轴压缩试验、三轴压缩试验和三轴拉伸试验),并将计算得到的应力-应变关系和体积变化与实验观测结果对比,模型计算的结果与实验结果符合较好,验证了HISS模型用于砂土性质描述的适用性,并将模型用于分析分层路基的平板载荷试验。HISS模型三维子程序的实现为ABAQUS分析三维土体弹塑性问题提供了一种新的本构关系。
The yield surface of the HIS model is a single smooth function that solves the mathematical incompleteness of the “hat” model. In this paper, we introduce the 1? Model of isotropic hardening in HISS model and the influence of its main parameters on the yield plane. By using MATLAB, a Gaussian integration point is loaded, and the stress path and yield during loading are observed Based on the secondary development platform provided by ABAQUS finite element program, the 3D user material subroutine of soil HISS model was first written. A user subroutine developed with the ABAQUS extration simulates four kinds of triaxial test cases (hydrostatic test, conventional triaxial compression test, triaxial compression test and triaxial tensile test) of Leighton Buzzard sand soil. The calculated stress-strain relationship and volume change are in good agreement with the experimental results. The calculated results agree well with the experimental results, which verify the applicability of the HISS model for the sand property description. The model is also used to analyze the layered subgrade The plate load test. The realization of HISS model three-dimensional subroutine provides a new constitutive relation for ABAQUS analysis of elasto-plastic three-dimensional soil.