This paper presents the calibration and validation for a new 3D elastoviscoplastic soil model, MIT‐SR, for Resedimented Boston Blue Clay (RBBC). The calibration procedure requires selection of material constants from standard types of laboratory consolidation and undrained shear tests, and a procedure for initialization of state variables. The formulation includes two key input parameters that describe sensitivity of rate dependence, β, and creep behavior,  ρ_α, for which the calibration requires data including CRS consolidation tests at a range of strain rates and drained creep tests. The calibrated MIT‐SR model is benchmarked through a series of simulations of K₀‐consolidated triaxial shear tests and direct simple shear tests on RBBC performed at different rates of shear strain. The calibrated model provides very good predictions of the effects of shear strain rate on key engineering properties such as undrained shear strength, strain to peak shear resistance and critical state conditions as functions of the consolidation stress history. The predictions of multistage, undrained relaxation tests are also in good agreement with unique measured behavior reported for RBBC. The comparisons provide clear evidence of the advances in predictive capabilities achieved using the proposed MIT‐SR formulation compared to preexisting isotache‐type models.

中文翻译：

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新型弹黏塑性土壤模型的校准和验证

本文介绍了一种新的3D弹性粘塑性土壤模型MIT‐SR的校准和验证，该模型用于再沉积波士顿蓝粘土（RBBC）。校准程序需要从实验室固结和不排水剪切测试的标准类型中选择材料常数，以及用于初始化状态变量的程序。所述制剂包括描述率依赖性，灵敏度两个关键输入参数β，和蠕变行为， ρ _α，为此，校准需要的数据，包括在一个范围内的应变率的CRS固结试验和排水蠕变试验。校准的MIT‐SR模型通过一系列K ₀模拟进行基准测试在不同的剪切应变速率下对RBBC进行了固结三轴剪切试验和直接简单剪切试验。校准后的模型可以很好地预测剪切应变速率对关键工程性能的影响，例如不排水的剪切强度，应变至峰值的剪切阻力以及临界状态条件，这些都是固结应力历史的函数。多阶段不排水松弛测试的预测也与针对RBBC报告的独特测量行为非常吻合。这些比较清楚地表明，与现有的等腰线型模型相比，使用拟议的MIT-SR公式可以实现预测能力的提高。