工程地质学报2024，Vol.32Issue(1)：19-27,9.DOI:10.13544/j.cnki.jeg.2021-0674
干湿循环与盐溶液作用下红黏土-膨润土混合土体变与渗透特性
VOLUME CHANGE AND PERMEABILITY CHARACTERISTICS OF RED CLAY-BENTONITE MIXTURES UNDER WETTING-DRYING CYCLES AND SALT SOLUTION INFILTRATION
摘要
Abstract
To investigate the performance evolution of red clay-bentonite mixtures concerning wetting-drying cycles and chemical conditions,volume change and permeability tests were conducted on red clay-bentonite mixtures under salt solution infiltration and wetting-drying cycles.The effects of wetting-drying cycles,bentonite contents,and salt solution concentrations on the compacted mixtures were analyzed.The microscopic mechanisms of shrinkage and hy-draulic conductivity after different wetting-drying cycles were revealed through mercury intrusion porosimetry(MIP)tests.Experimental results demonstrated that the shrinkage of compacted soil samples increases gradually with an in-crease in wetting-drying cycles and salt solution concentration.The hydraulic conductivity of the soil samples increases first and then decreases during the wetting-drying cycles.Meanwhile,the addition of bentonite improves the chemical capacity of the soil samples and has the potential to decrease hydraulic conductivity and volume change.MIP test re-sults revealed that the total pore volume and the macro-pore diameter of the soil samples decrease after wetting-drying cycles,and the bimodal characteristics of the pore distribution curves weaken.Furthermore,with an increase in salt solution concentration,the micro-pores remain constant,and the porosity of the soil decreases with a decrease in macro-pores,resulting in greater shrinkage deformation and decreased hydraulic conductivity.关键词
红黏土/膨润土/干湿循环/渗透系数/盐溶液/压汞试验Key words
Red clay/Bentonite/Wetting-drying cycles/Hydraulic conductivity/Salt solution/Mercury intrusion porosimetry分类
建筑与水利引用本文复制引用
朱考飞,张可能,贺勇..干湿循环与盐溶液作用下红黏土-膨润土混合土体变与渗透特性[J].工程地质学报,2024,32(1):19-27,9.基金项目
国家自然科学基金项目(资助号:41972282,41807253,42072318),湖南省自然科学基金(资助号:2019JJ50763),国家重点研发计划项目(资助号:2019YFC1803600,2019YFC1805900),中南大学中央高校基本科研业务费专项资金(资助号:2021zzts0254),湖南省研究生科研创新项目(资助号:CX20210272).This research is supported by the National Natural Science Foundation of China(Grant Nos.41972282,41807253,42072318),the Natural Sci-ence Foundation of Hunan Province(Grant No.2019JJ50763),the National Key Research and Development Program of China(Grant Nos.2019YFC1803600,2019YFC1805900),the Fundamental Research Funds for the Central Universities of Central South University(Grant No.2021zzts0254)and the Postgraduate Scientific Research Innovation Project of Hunan Province(Grant No.CX20210272). （资助号:41972282,41807253,42072318）
