岩土工程学报2026，Vol.48Issue(3)：608-618,11.DOI:10.11779/CJGE20230373
水-力-化耦合效应下膨润土衬垫防渗特性研究
Hydro-mechanical-chemical coupling effects on hydraulic conductivity of geosynthetic clay liners
摘要
Abstract
A series of flexible-wall permeameter tests is conducted to investigate the effects of confining pressure and chemical solutions on the hydraulic performance of sodium bentonite-based geosynthetic clay liners(GCLs).The results show that under deionized water permeation,the hydraulic conductivity of GCLs decreases logarithmically with increasing confining pressure,indicating strong stress sensitivity.At low to moderate concentrations,divalent cations have a significantly greater detrimental effect on GCL performance than monovalent cations.While NaCl solutions cause less than an order-of-magnitude increase in hydraulic conductivity,CaCl2 solutions severely suppress the swelling capacity of bentonite,enlarge inter-granular voids,and result in up to five orders of magnitude increase in permeability with rising concentration.Additionally,physical disturbances such as wrinkling lead to non-uniform granular distribution and preferential flow paths,resulting in an approximately one-order-of-magnitude increase in hydraulic conductivity.Under coupled stress-chemical conditions,GCLs exhibit minimal sensitivity to confining pressure in low-concentration or monovalent cation solutions.However,in high-concentration divalent cation environments,increasing the confining pressure can reduce hydraulic conductivity by about three orders of magnitude;yet,the values still fail to meet the Chinese national standard of 10-11 m/s.At the mesoscale,granular size,spatial distribution,porosity,and the formation of continuous flow channels in bentonite are identified as key factors that governing the structural evolution and eventual hydraulic failure of GCLs.关键词
膨润土衬垫/渗透试验/化学/应力/渗透系数Key words
Geosynthetic Clay Liner(GCL)/permeation test/chemical/stress/hydraulic conductivity分类
建筑与水利引用本文复制引用
侯娟,楚辰玺,孙银玉,张金榜,孙瑞..水-力-化耦合效应下膨润土衬垫防渗特性研究[J].岩土工程学报,2026,48(3):608-618,11.基金项目
国家自然科学基金项目(52478349,51978390,51778353) （52478349,51978390,51778353）
青海省二〇二三年基础研究计划项目(2023-ZJ-756) （2023-ZJ-756）
国家留学基金项目(CSC201906895014)This work was supported by the National Natural Science Foundation of China(Grant Nos.52478349,51978390 and 51778353),2023 Basic Research Program of Qinghai Province(2023-ZJ-756),and the China Scholarship Council(Grant No.CSC201906895014). （CSC201906895014）
