Investigation of water retention and volumetric deformation characteristics of soils subjected to wetting–drying cycles

IF 3.7 2区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL
Shujian Wang, Yiyi Liu, Chuanshan Wu, Yixin Li, Ronghua Zhang, Senlin An, Hongguang Jiang, Zhanyong Yao
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Abstract

The variation in soil moisture can lead to unfavourable deformation of highway embankments, threatening their long-term stability under seasonal groundwater level fluctuations and frequent changes in evaporation and precipitation. This paper conducted unsaturated soil triaxial tests to examine soil water retention and volumetric deformation behavior during wetting–drying cycles. The results show that soil water retention decreases with increasing wetting–drying cycles, particularly in the low suction range from 0 to 100 kPa, where gravimetric moisture content (GMC) declines sharply. With more wetting–drying cycles, the soil’s capacity for volumetric deformation diminishes. The soil has a loose soil structure and is more prone to plastic deformation. Furthermore, three soil water retention models, the Gallipoli, Tarantino, and Hu models were employed to analyse soil’s hydromechanical behaviours and evaluate the effect of wetting–drying cycles. It was found that Tarantino’s model used only three fitting parameters, which were more concise and maintained a good fitting effect. This study clarifies soil–water retention and volumetric deformation behavior during wetting–drying cycles, which is essential for effective water control in subgrade construction and operation.

Abstract Image

干湿循环作用下土体保水性和体积变形特性研究
土壤湿度的变化会导致公路路堤的不利变形,威胁其在季节性地下水位波动和蒸发降水频繁变化下的长期稳定性。本文对非饱和土进行了三轴试验,研究了干湿循环过程中土体的保水性和体积变形特性。结果表明:随着干湿循环次数的增加,土壤保水率降低,特别是在0 ~ 100 kPa的低吸力范围内,土壤的重力含水率(GMC)急剧下降;随着干湿循环次数的增加,土体的体积变形能力减小。土质结构松散,更容易发生塑性变形。此外,采用Gallipoli、Tarantino和Hu三种土壤保水模型分析了土壤的水力学行为,并评价了干湿循环对土壤的影响。发现Tarantino的模型只使用了三个拟合参数,更加简洁,保持了良好的拟合效果。该研究阐明了干湿循环过程中土体的保水特性和体积变形特性,为路基施工和运行中的有效治水提供了依据。
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来源期刊
Bulletin of Engineering Geology and the Environment
Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合
CiteScore
7.10
自引率
11.90%
发文量
445
审稿时长
4.1 months
期刊介绍: Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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