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首页> 外文期刊>Canadian Geotechnical Journal >Modeling swelling-shrinkage behavior of compacted expansive soils during wetting-drying cycles
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Modeling swelling-shrinkage behavior of compacted expansive soils during wetting-drying cycles

机译：在湿润-干燥循环中模拟压实膨胀土的胀缩行为

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This paper presents a straightforward approach for modelling volume change behavior of expansive soils during wetting-drying cycles. The swelling-shrinkage strain of expansive soils induced by cyclic wetting and drying was decomposed with distinctive physical background into a reversible component, which shows a synchronous change with the cyclic change of suction, and an irreversible component, which is generated mainly in the early stage of the wetting-drying process. The mechanisms of the two swelling-shrinkage strain components can be well explained through the double-level structure of expansive soils and its evolution with mechanical and hydraulic loading. The reversible component originates from the reversible deformation behavior of aggregates, and primarily depends on current suction or water content. The irreversible component is associated with the irreversible change of macrostructure, reflecting the difference in soil structures at current state and the equilibrium state. A practical constitutive model was proposed for compacted expansive clays from a global and phenomenological perspective. The model parameters can be calibrated with observed macroscopic deformation behavior without measuring microstructural parameters. The performance of the presented model was validated by simulating cyclic suction-controlled tests as well as an alternately soaked and dried test with irregular amplitudes of suctions.
机译：本文提出了一种简单的方法，用于模拟干湿循环中膨胀土的体积变化行为。循环湿润和干燥引起的膨胀土的胀缩应变具有独特的物理背景，分解成可逆成分，与吸力的循环变化呈同步变化，不可逆成分主要发生在早期。干燥过程。通过膨胀土的双层结构及其在机械和水力作用下的演化，可以很好地解释这两种膨胀-收缩应变分量的机理。可逆成分源自骨料的可逆变形行为，并且主要取决于当前的吸力或水含量。不可逆成分与宏观结构的不可逆变化有关，反映了当前状态和平衡状态下土壤结构的差异。从全局和现象学的角度提出了一种实用的本构模型，用于压实膨胀粘土。可以使用观察到的宏观变形行为对模型参数进行校准，而无需测量微观结构参数。通过模拟周期性吸力控制测试以及交替吸水和干燥的吸力幅度不规则的测试，验证了所提出模型的性能。

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