Morphology characterization of unsaturated soils under drying-wetting cycles: crack opening and closure

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Acta Geotechnica Pub Date : 2024-05-12 DOI:10.1007/s11440-024-02347-3
Zhuang Zhuo, Weiling Cai, Cheng Zhu, Chao-Sheng Tang, Kaniz Roksana
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Abstract

The volumetric and hydrological responses of clayey soils subjected to drying-wetting (D-W) cycles are of paramount importance for the integrity of geoenvironmental infrastructures. The study aimed to investigate the cracking behavior of clayey soils under D-W cycles by using advanced 2D imaging and 3D scanning techniques to capture the initiation and propagation of desiccation cracks within a soil specimen. The temporal variation in the soil water content and the corresponding 2D digital photography and 3D morphology of cracks were simultaneously monitored, and the cracking characteristics were interpreted. It was found that the time-dependent evaporation process was independent of the D-W cycles. Both 2D and 3D characterization showed the cracking hysteresis phenomenon in the unsaturated soil, which indicates the dependency of the crack opening and closure on the degree of saturation. D-W cycles led to the formation of subcracks and the increase in the total crack length, reflecting the soil degradation. Additionally, it was demonstrated that the 3D characterization exhibited the advantage of capturing the volumetric change and the subtle change in the macroporosity of the cracked soil over the 2D visualization. The current study provides a perspective of combining 2D and 3D characterization for interpreting the volumetric change of cracked soils and enhancing the understanding of the hydromechanical responses and the soil-atmosphere interactions.

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干燥-湿润循环条件下非饱和土壤的形态特征:裂缝开合
粘性土在干燥-湿润(D-W)循环下的体积和水文响应对地质环境基础设施的完整性至关重要。本研究旨在利用先进的二维成像和三维扫描技术,捕捉土壤试样中干燥裂缝的产生和扩展过程,从而研究粘性土壤在干湿循环条件下的开裂行为。同时监测了土壤含水量的时间变化以及相应的二维数字摄影和三维裂缝形态,并对裂缝特征进行了解释。研究发现,与时间相关的蒸发过程与 D-W 周期无关。二维和三维表征均显示了非饱和土壤中的裂缝滞后现象,这表明裂缝的开合与饱和度有关。D-W 循环导致子裂缝的形成和总裂缝长度的增加,反映了土壤退化。此外,与二维可视化相比,三维表征在捕捉开裂土壤的体积变化和宏观孔隙度的微妙变化方面具有优势。当前的研究提供了一个结合二维和三维表征的视角,以解释开裂土壤的体积变化,并加深对水力学响应和土壤-大气相互作用的理解。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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