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适宜的土体本构模型在岩土工程数值计算中至关重要。考虑土的小应变特性的硬化土本构模型(HSS模型)是一种较为完善的高级本构模型,可以模拟土的双曲线型应力应变关系、压硬性、剪涨性、加卸载条件下土体刚度的差异以及小应变状态下土的非线性弹性等主要工程特性。采用HSS本构模型,使用有限元程序Z_Soil对软土地层中的某超大型深基坑进行了3D数值分析。数值计算的结果和实测值较为符合,验证了采用的数值方法的可靠性,也表明HSS模型较适合用于软土深基坑的数值分析。
Appropriate soil constitutive model is very important in geotechnical numerical calculation. The HSS model, which considers the small strain of soil, is a well-established, high-level constitutive model that simulates the hyperbolic stress-strain relationship of soil, compressive stiffness, shearing, soil under loading and unloading The difference of body stiffness and the nonlinear characteristics of soil under small strain. Using HSS constitutive model, 3D finite element program Z_Soil is used to analyze the 3D numerical analysis of a very large deep foundation pit in soft soil. The numerical results are in good agreement with the measured values, which verifies the reliability of the numerical method adopted. It also shows that the HSS model is more suitable for the numerical analysis of deep foundation pit in soft soil.