非膨胀性包边土溶质运移对膨胀土电化学性质影响试验研究

金属矿山 ›› 2025, Vol. 54 ›› Issue (11): 273-280.

非膨胀性包边土溶质运移对膨胀土电化学性质影响试验研究

佘剑波^1,2,3　李　帅^1,2　鲜少华⁴　汤友生⁵　徐　俊^1,2　左冬立¹　卢　正³

1.湖北省城市地质工程院,湖北武汉 430050;2.湖北地矿建设工程承包集团有限公司,湖北武汉 430050; 3.中国科学院武汉岩土力学研究所岩土力学与工程安全全国重点实验室,湖北武汉 430071; 4.武汉市政工程设计研究院有限责任公司,湖北武汉 430023;5.中国联合工程有限公司,浙江杭州 310052

出版日期:2025-11-15 发布日期:2025-12-02
作者简介:佘剑波(1993—),男,工程师,博士。
基金资助:
湖北省自然科学基金项目(编号:2023AFD214,2025AFD459);湖北省重点研发计划项目(编号:2024BCB081);岩土力学与工程安全全国重点实验室开放基金项目(编号:SKLGGES-024033);湖北省地质局科技项目(编号:KJ2025-46);湖北省自然资源科技项目(编号: ZRZY2025KJ43)。

Experimental Study on the Effect of Solute Transport in the CNS Layer on the Electrochemical Properties of Expansive Soil

SHE Jianbo^1,2,3　LI Shuai^1,2　XIAN Shaohua⁴　TANG Yousheng⁵　XU Jun^1,2　ZUO Dongli¹　LU Zheng³

1.Hubei Institute of Urban Geological Engineering,Wuhan 430050,China;2.Hubei Dijian Construction Co.,Ltd.,Wuhan 430050,China; 3.State Key Laboratory of Geomechanics and Geotechnical Engineering Safety,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;4.Wuhan Municipal Engineering Design & Research Institute Co.,Ltd.,Wuhan 430023,China; 5.China United Engineering Corporation Limited,Hangzhou 310052,China

Online:2025-11-15 Published:2025-12-02

摘要/Abstract

摘要： 非膨胀性黏土(Cohesive non-swelling soil,CNS)包边技术是膨胀土地区广泛采用的工程处置方法。为探究在降雨入渗过程中包边土溶质运移对膨胀土电化学性质以及宏观变形的影响规律,基于动电机制,通过设置4组 CNS覆盖层模型试验,开展了注水饱和条件下的膨胀变形、土体孔隙液离子浓度以及自然电位差监测,分析了水分入渗、溶质运移与膨胀土层的变形、电位差之间的联系。试验结果表明:① CNS层中的Ca2+、Mg2+等阳离子会向下迁移并聚集在膨胀土层中,产生的离子交换作用以及在孔隙中形成的离子环境改善了膨胀土的电化学性质,在宏观上表现为对其膨胀变形的抑制作用;② CNS层越厚,迁移聚集在膨胀土中的阳离子浓度越高,对其变形发展的抑制效果越显著;③ 土体渗流场变化以及溶质迁移分布与膨胀土层、CNS层的电位差之间具有明显的相关性,通过监测自然电位差,可判断水分入渗过程中阳离子迁移的变化情况,以及对膨胀土电化学性质改善和变形发展抑制的程度。研究成果可为自然电位法在膨胀土地区工程安全监测中的应用提供参考。

关键词: 膨胀土　非膨胀性黏土　自然电位　溶质运移　室内模型试验

Abstract: Cohesive non-swelling soil (CNS) covering technology is a widely applied engineering method in expansive soil areas.To investigate the effects of solute transport in the CNS layer on the electrochemical properties and macro-deforma tion of expansive soil during rainfall infiltration,four laboratory model tests were conducted.The tests involved monitoring the swelling deformation of expansive soil,cation concentrations in pore solution,and self-potential of soil layers under the saturated process.The analysis focused on the relationships between water infiltration,solute transport,and swelling deformation and po tential difference of the expansive soil layer.Results showed that:① Cations such as Ca2+ and Mg2+ from the CNS layer migra ted downward and accumulated in the underlying expansive soil layer.The resulting ion exchange and the altered ionic environ ment in the pores improved the electrochemical properties of expansive soil,which is macroscopically manifested as an inhibi tion effect on its swelling deformation.② A thicker CNS layer leaded to a higher concentration of cations migrating and accu mulating in expansive soil,resulting in a more pronounced inhibition effect.③ Clear correlations were observed between varia tions in the soil seepage field,solute distribution,and potential difference of the expansive soil layer and CNS layer.Monitoring the self-potential difference allows for tracking ion migration during water infiltration,as well as assessing the degree of im provement in electrochemical properties and the inhibition of deformation development of expansive soil.These findings indicate that the self-potential method has potential application in safety monitoring in engineering projects located in expansive soil re gions.

Key words: expansive soil,cohesive non-swelling soil (CNS),self-potential,solute transport,laboratory model test

中图分类号:

P641

佘剑波, 　李　帅, 　鲜少华　汤友生　徐　俊, 　左冬立　卢　正. 非膨胀性包边土溶质运移对膨胀土电化学性质影响试验研究[J]. 金属矿山, 2025, 54(11): 273-280.

SHE Jianbo, 　LI Shuai, 　XIAN Shaohua　TANG Yousheng　XU Jun, 　ZUO Dongli　LU Zheng. Experimental Study on the Effect of Solute Transport in the CNS Layer on the Electrochemical Properties of Expansive Soil[J]. Metal Mine, 2025, 54(11): 273-280.

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