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剪切-体积双屈服机制的硬化土(Hardening-Soil)模型能够相对准确地反映土体复杂应力路径的影响在岩土工程中已得到广泛的应用,国内的相关研究对于其体积屈服机制的理解上普遍存在着偏差,相关文献对于其内部控制参数解法的描述并不正确,无法体现该模型准确模拟单轴压缩及K0固结特性等方面的优势。笔者从对其体积屈服和硬化内部控制参数的物理意义的着手,解释了该模型体积屈服机制的工作过程,并进一步给出了其内部控制参数的显式解析算法及推导过程。针对于该模型的非线性弹性-多屈服机制塑性所导致的数值求解复杂性,给出了其基于改进欧拉中点法的本构积分算法,结合相关研究的参考试验及数值计算结果进行了验证。
The shear-volume dual yield mechanism of Hardening-Soil model can relatively accurately reflect the influence of complex soil stress path has been widely used in geotechnical engineering, domestic research on its volume yield mechanism understanding There is a widespread bias. The related literature does not give a correct description of the solution of its internal control parameters, which can not reflect the advantages of this model in accurately simulating uniaxial compression and K0 consolidation characteristics. The author explains the working process of the volume yield mechanism of the model and gives the explicit analytic algorithm and derivation process of its internal control parameters from the physical meaning of its volume yield and hardening internal control parameters. Aiming at the complexity of the numerical solution of the nonlinear elastic multi-yield mechanism plasticity of the model, the constitutive integral algorithm based on the improved Euler’s method is given. Combined with the related experiments and the numerical results verification.