Currently, our understanding of material‐scale deterioration resulting from meteorologically induced variations in pore water pressure and its significant impact on infrastructure slopes is limited. To bridge this knowledge gap, we have developed an extended kinematic hardening constitutive model for unsaturated soils that refines our understanding of weather‐driven deterioration mechanisms in heterogeneous clay soils. This model has the capability of predicting the irrecoverable degradation of strength and stiffness that has been shown to occur when soils undergo wetting and drying cycles. The model is equipped with a fully coupled and hysteretic water retention curve and a hysteretic loading–collapse curve and has the capability to predict the irrecoverable degradation of strength and stiffness that occurs during cyclic loading of soils. Here, we employ a fully implicit stress integration technique and give particular emphasis to deriving a consistent tangent operator, which includes the linearisation of the retention curve. The proposed algorithm is evaluated for efficiency and performance by simulating various stress and strain‐driven triaxial paths, and the accuracy of the integration technique is evaluated through the use of convergence curves.

中文翻译：

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非饱和土运动硬化模型的公式和隐式数值积分


目前，我们对气象引起的孔隙水压力变化及其对基础设施边坡的重大影响导致的材料尺度劣化的理解是有限的。为了弥合这一知识差距，我们为非饱和土开发了一个扩展的运动学硬化本构模型，该模型完善了我们对非均质粘土中天气驱动劣化机制的理解。该模型能够预测土壤经历湿润和干燥循环时发生的强度和刚度的不可恢复的退化。该模型配备了全耦合和滞后保水曲线和滞后载荷-塌陷曲线，能够预测土壤循环加载过程中发生的强度和刚度的不可恢复的退化。在这里，我们采用了一种完全隐式的应力积分技术，并特别强调推导出一个一致的切算子，其中包括保持曲线的线性化。通过模拟各种应力和应变驱动的三轴路径来评估所提出的算法的效率和性能，并通过使用收敛曲线来评估集成技术的准确性。