岩土工程学报2025，Vol.47Issue(11)：2237-2245,9.DOI:10.11779/CJGE20240803
温控盐溶液入渗的GMZ膨润土膨胀变形研究
Study on swelling deformation of GMZ bentonite infiltrated with salt solutions considering temperature effects
摘要
Abstract
Investigation on swelling deformation of bentonite infiltrated with salt solutions considering temperature effects is of great significance for design and safely operation of deep geological repositories for disposal of high-level radioactive wastes.In this study,one dimensional deformation tests are performed on GMZ bentonite specimens with infiltration of NaCl and CaCl2 solutions at different temperatures.Coupled temperature and salt solution effects on the swelling deformation properties are investigated.Meanwhile,MIP tests and SEM tests are performed to find out the micro-mechanism of the effects of temperature and salt solution on swelling deformation.Results indicate that the time to reach the maximum swelling strain is reduced and the maximum swelling strain decreases with increasing temperature and concentrations.In high concentration of salt solutions,the thickness of the diffuse double layers decreases,the osmotic suction and effective stress increase;meanwhile,the increase of temperature causes the shrinkage of inter-aggregate pores and the lattice contraction,and also inhibits the expansion of the diffuse double layers.As a result,the pore density of inter-aggregate pores decreases,the inter-aggregate pores are filled and blocked during the hydration process,and the swelling capacity of bentonite decreases.Finally,a model for the time-evolution curve of swelling deformation considering temperature and concentration of salt solution is proposed.关键词
高庙子膨润土/膨胀变形/盐溶液/温度/微观结构/模型Key words
GMZ bentonite/swelling deformation/salt solution/temperature/micro-structure/model分类
土木建筑引用本文复制引用
叶为民,邵长跃,王琼,陈永贵,陈亮..温控盐溶液入渗的GMZ膨润土膨胀变形研究[J].岩土工程学报,2025,47(11):2237-2245,9.基金项目
国家自然科学基金项目(42030714)This work was supported by National Natural Science Foundation of China(Grant No.42030714). （42030714）
