In this paper, a multi-surface anisotropic constitutive model is proposed for clayey soils, based on bounding surface theory and a classical anisotropic critical state-based model. In the proposed model, in addition to the volumetric hardening law, a rotational hardening rule is also incorporated into the bounding surface formulation with a non-associated flow rule. The model uses the bounding surface plasticity theory to produce a more realistic representation of the nonlinear behavior of clays with high overconsolidation ratios. Detailed model formulation is presented including an innovative approach to find image stress points on the bounding surface which offers an original conception of changing the projection center, even at the absence of plastic loading. A modified procedure is also discussed to improve the performance of the proposed model for simulating the response of highly overconsolidated clays. The proposed modifications, together with the novel mapping rule, form a new framework that can be used to improve the simulation capabilities of different constitutive models that have elliptical yield/bounding surfaces. The efficiency of the framework is demonstrated by comparing the simulation results against element test data from a number of different clays at lightly to highly overconsolidated conditions. The new model shows promising capabilities in capturing the important aspects of natural clays response during straining, in particular for the combined effects of small strain nonlinearity with fabric orientation.

本文基于边界面理论和经典的基于各向异性临界状态的模型，提出了一种黏土的多表面各向异性本构模型。在提出的模型中，除了体积硬化定律外，旋转硬化规则还与非关联流动规则结合到边界曲面配方中。该模型使用边界表面可塑性理论来更真实地表示具有高超固结比的粘土的非线性行为。提出了详细的模型公式，包括在边界表面上找到图像应力点的创新方法，即使在没有塑料负载的情况下，它也提供了改变投影中心的原始概念。还讨论了一种改进的程序，以改善所提议模型的性能，以模拟高度超固结的黏土的响应。所提出的修改与新颖的映射规则一起形成了一个新的框架，该框架可用于提高具有椭圆屈服/边界曲面的不同本构模型的仿真能力。通过将模拟结果与轻度至高度超固结条件下来自许多不同粘土的元素测试数据进行比较，证明了框架的效率。新模型显示出在捕捉应变过程中天然粘土响应的重要方面方面很有希望的功能，特别是对于小应变非线性与织物取向的综合影响。所提出的修改与新颖的映射规则一起形成了一个新的框架，该框架可用于提高具有椭圆屈服/边界曲面的不同本构模型的仿真能力。通过将模拟结果与轻度至高度超固结条件下来自许多不同粘土的元素测试数据进行比较，证明了框架的效率。新模型显示出在捕捉应变过程中天然粘土响应的重要方面方面很有希望的功能，特别是对于小应变非线性与织物取向的综合影响。所提出的修改与新颖的映射规则一起形成了一个新的框架，该框架可用于提高具有椭圆屈服/边界曲面的不同本构模型的仿真能力。通过将模拟结果与轻度至高度超固结条件下来自许多不同粘土的元素测试数据进行比较，证明了框架的效率。新模型显示出在捕捉应变过程中天然粘土响应的重要方面方面很有希望的功能，特别是对于小应变非线性与织物取向的综合影响。通过将模拟结果与轻度至高度超固结条件下来自许多不同粘土的元素测试数据进行比较，证明了框架的效率。新模型显示出在捕捉应变过程中天然粘土响应的重要方面方面很有希望的功能，特别是对于小应变非线性与织物取向的综合影响。通过将模拟结果与轻度至高度超固结条件下来自许多不同粘土的元素测试数据进行比较，证明了框架的效率。新模型显示出在捕捉应变过程中天然粘土响应的重要方面方面很有希望的功能，特别是对于小应变非线性与织物取向的综合影响。