Pore-fluid salinity effect on desiccation cracking of fine-grained soils

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL

Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-18 DOI:10.1007/s10064-024-03958-6

Zhonghao Sun, Shiyu Ren, Xin Wei, Ling Xu

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Abstract

Desiccation cracks in soil cause undesirable impacts on soil properties. Increasing extreme heat and drought events may lead to more severe soil salinization and desiccation cracking. However, the discrepancies and intrinsic mechanisms of the cracking behaviors of different fine-grained soils affected by pore-fluid salinity are unclear. This study investigates the pore-fluid salinity effect on cracking characteristics of different fine-grained soils. Desiccation crack tests with a wide range of salt concentrations are conducted for three fine-grained soils with different sensitivity to pore-fluid chemistry. Liquid limit tests and scanning electron microscopy analyses are carried out to investigate the effect of particle-fluid interactions and microstructure changes on cracking. The degree of cracking is the largest in bentonite and varies greatly with the change of pore-fluid salinity. Cracking in kaolin is less affected by pore fluids, showing a slight decrease at large NaCl concentrations. The degree of cracking is the lowest in silt and shows no clear trend with the change of pore-fluid salinity. Detailed quantitative characteristics of crack patterns are compared. Liquid limit tests and scanning electron microscopy analyses reveal different electrical sensitivity of the three soils to pore fluid influenced by particle-fluid interactions and changes in microstructure. Crack parameters exhibit a larger variation for bentonite with high electrical sensitivity and are relatively stable for soils with low electrical sensitivity. The correlation between the electrical sensitivity and the crack parameters is relevant to the evaluation and control of desiccation crack in fine-grained soils with various pore-fluid salinities.

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孔隙流体盐度对细粒土干燥开裂的影响

土壤干燥裂缝会对土壤性质造成不良影响。越来越多的极端高温和干旱事件可能会导致更严重的土壤盐碱化和干燥开裂。然而，不同细粒土受孔隙流体盐度影响的开裂行为差异及其内在机理尚不清楚。本研究探讨了孔隙流体盐度对不同细粒土开裂特性的影响。针对对孔隙流体化学性质敏感性不同的三种细粒土，进行了盐浓度范围较大的干燥裂缝试验。通过液限试验和扫描电子显微镜分析，研究了颗粒-流体相互作用和微观结构变化对开裂的影响。膨润土的开裂程度最大，而且随着孔隙流体盐度的变化而变化很大。高岭土的开裂受孔隙流体的影响较小，在氯化钠浓度较大时略有减少。粉砂的开裂程度最低，并且随着孔隙流体盐度的变化没有明显的趋势。比较了裂纹模式的详细定量特征。液限测试和扫描电子显微镜分析表明，受颗粒-流体相互作用和微观结构变化的影响，三种土壤对孔隙流体的电敏感性不同。电灵敏度高的膨润土的裂纹参数变化较大，而电灵敏度低的土壤的裂纹参数相对稳定。电灵敏度与裂缝参数之间的相关性对于评估和控制具有不同孔隙流体盐度的细粒土中的干燥裂缝具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.