Formulation and Implicit Numerical Integration of a Kinematic Hardening Model for Unsaturated Soils

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Lluís Monforte, Mohamed Rouainia
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引用次数: 0

Abstract

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.
非饱和土壤运动硬化模型的制定和隐式数值积分
目前,我们对气象引起的孔隙水压力变化导致的材料尺度劣化及其对基础设施边坡的重大影响了解有限。为了弥补这一知识空白,我们开发了一种非饱和土壤的扩展运动硬化构成模型,该模型完善了我们对异质粘土中天气驱动劣化机制的理解。该模型能够预测强度和刚度的不可恢复退化,这种退化已被证明会在土壤经历湿润和干燥循环时发生。该模型配备了完全耦合的滞后保水曲线和滞后加载-塌陷曲线,能够预测土壤在循环加载过程中发生的不可恢复的强度和刚度退化。在此,我们采用了完全隐式应力积分技术,并特别强调了一致切线算子的推导,其中包括滞留曲线的线性化。通过模拟各种应力和应变驱动的三轴路径,对所提出算法的效率和性能进行了评估,并通过收敛曲线对积分技术的准确性进行了评估。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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