摘要
为研究花岗岩残积土蒸发脱湿过程中的水分运移规律,对深圳花岗岩残积土进行了一系列核磁共振测试和微观试验,分析了花岗岩残积土双孔结构的成因,对比了不同饱和度下残积土的水分分布规律,提出了残积土双孔结构的水分运移机理.结果表明:氧化铁等胶结物与高岭土片层形成了花岗岩残积土的微孔结构;微孔结构与不易受扰动的大孔结构组成残积土的双孔结构;微孔结构和大孔结构在高饱和度下相互连通,在低饱和度下水力连接中断;双孔结构间水分同步蒸发,大孔结构向微孔结构的补给随着蒸发进行而减少.本研究可为研究复杂土体结构水分蒸发过程提供一定的理论基础.
To study the water migration mechanism of granite residual soil(GRS)during evaporation and dehy⁃dration,a series of nuclear magnetic resonance tests and microscopic tests were conducted on Shenzhen GRS.In this study,the formation reasons for the dual-pore structure of GRS were analyzed.We investigated the water distribu⁃tion under different degrees of saturation and proposed the mechanism of water migration in GRS.The results show that the micropore structure of GRS is formed by the cementation between iron oxide and kaolin layers;the dualpore structure is constituted by the micropore and macropore structure which is not easily disturbed;the micropore structure and macropore structure are interconnected at high saturation,and the hydraulic connection is interrupted at low saturation;water evaporates synchronously between the dual pore structures and the supply from the macro⁃pore structure to the micropore structure decreases with the evaporation.This research can provide the theoretical basis for water migration in complex soil structures.
作者
康馨
常文清
陈仁朋
刘鹏
KANG Xin;CHANG Wenqing;CHEN Renpeng;LIU Peng(Research Center for Advanced Underground Space Technologies,Hunan University,Changsha 410082,China;Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education(Hunan University),Changsha 410082,China;College of Civil Engineering,Hunan University,Changsha 410082,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第5期173-180,共8页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金重点项目(52090082)
国家自然科学基金资助项目(51938005,51808207)。
关键词
花岗岩残积土
低场核磁共振
蒸发
水分运移
granite residual soil
low-field nuclear magnetic resonance
evaporation
water migration
