Fully coupled fluid-mechanical numerical analyses using a nonlinear constitutive model to analyze soil deformation and liquefaction caused by monotonic or cyclic loading are challenging and in increasing demand. The constitutive model performance impacts the quality of the analysis and its practice-friendliness influences the calibration cost. The Dafalias-Manzari 2004 (DM04) two-surface model is a critical-state compatible and state-parameter-related plasticity model developed in the framework of Bounding Surface theory, which has been widely implemented and studied. However, improvements in performance and practice-friendliness justify the need for a reformulation and practical extension of the DM04 model. In this work, by revising some formulas without adding too much complexity and retaining the general 3D formulation, improved performances are achieved with good matches between the simulated results and experimental data as well as empirical relationships with various initial and loading conditions. The new model which was implemented in FLAC3D has internally calibrated parameters for the standard cyclic resistance field (SCRF) sand, which is compatible to cyclic resistance charts and empirical relations. SCRF sand modeling has proved useful in numerical experiments, overcoming the disturbance issue encountered during sampling preparation in laboratories. A case study of recorded downhole array ground motions using this proposed model and procedures is presented.

使用非线性本构模型来分析由单调或循环载荷引起的土壤变形和液化的全耦合流体力学数值分析具有挑战性，并且需求不断增加。本构模型的性能会影响分析的质量，其实用性会影响校准成本。Dafalias-Manzari 2004（DM04）两面模型是在边界面理论框架内开发的与临界状态兼容且与状态参数相关的可塑性模型，该模型已得到广泛实施和研究。但是，性能和实践友好性的提高证明需要重新制定和实际扩展DM04模型。在这项工作中，通过修改一些公式而又不增加太多复杂性并保留通用的3D公式，通过在模拟结果和实验数据之间建立良好的匹配以及在各种初始和加载条件下的经验关系，可以实现更高的性能。已在中实施的新模型FLAC3D具有用于标准循环电阻场（SCRF）砂的内部校准参数，该参数与循环电阻图和经验关系兼容。事实证明，SCRF砂模型在数值实验中很有用，它可以克服实验室样品准备过程中遇到的干扰问题。提出了一个使用这种建议的模型和程序记录井下阵列地面运动的案例研究。