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Unsaturated and Saturated Soil-Structure Interface Effect on Cracking Behavior of Soil

机译：不饱和和饱和土结构界面对土壤开裂行为的影响

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Soil-structure interfaces occur at the contact surfaces between the soils and the engineering constructions, such as retaining wall, foundations, and others, where reciprocal transition of stresses takes place at interfaces. An intrinsic motivation of this work stemmed from observations of problematic behavior of natural deposited soils and engineered soils during drying-wetting processes due to variations in annual thermal conditions. In response to variations in environmental conditions, unsaturated soils may experience different hydraulic, and mechanical behavior under wetting and drying processes due to hysteresis. This may cause evolution and propagation of cracks in the soil. In this study, four drying tests (shrinkage tests) were performed using identical circular plates. Two plates were fabricated; one with smooth-base and the other one with circular-grooved-base. The smooth plate was employed to allow the soil sample to shrink freely without crack formation, while the groove plate was used to provide restraints during shrinkage where cracks may develop during drying process. Furthermore, soil samples were tested under saturated and unsaturated in order to investigate the influence of initial moisture conditions of soils on the initiation and propagation of cracks during one drying and wetting cycle. Crack patterns were quantitatively obtained using image analysis techniques. The results of the drying tests refer to the important impact of soil-interface and the initial saturation conditions on the initiation and propagation of cracks during wetting and drying cycle.
机译：土壤结构界面发生在土壤和工程结构之间的接触表面处，例如挡土墙，基础等，其中应力的往复转变在接口处发生。这项工作的内在动机源于在干燥润湿过程中的天然沉积土壤和工程土壤的成问题行为观察，由于年度热条件的变化。响应于环境条件的变化，不饱和土可能会在滞后和干燥过程中经历不同的液压和机械行为。这可能导致土壤中裂缝的演化和传播。在该研究中，使用相同的圆形板进行四种干燥试验（收缩试验）。制造两块板;一种具有光滑底座，另一个具有圆形沟槽底座。使用光滑的板允许土壤样品在没有裂缝的情况下自由地缩小，而凹槽板用于在干燥过程中产生裂缝期间的收缩期间提供约束。此外，在饱和和不饱和的饱和和不饱和下进行土壤样品，以研究一种干燥和润湿循环期间土壤初始水分条件对裂缝引发和繁殖的影响。使用图像分析技术定量地获得裂缝图案。干燥试验的结果是指土壤 - 界面和初始饱和条件对润湿和干燥循环期间裂缝的起始和传播的重要影响。

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