路基工程Issue(2)：1-8,8.DOI:10.13379/j.issn.1003-8825.202308033
干湿路径下非饱和黄土渗透特性及微观机理研究
Study on Infiltration Characteristics and Micro-mechanism of Unsaturated Loess under Dry and Wet Paths
摘要
Abstract
The unsaturated infiltration test of loess was carried out by using the transient cross-section method based on nuclear magnetic resonance(NMR)technology,and the infiltration characteristics of loess under two different paths of dry and wet were studied,and the infiltration mechanism of unsaturated loess under the paths of dry and wet was explored at the microscopic level by analyzing the changes in the distribution of pore water in the process of seepage.The results show that:in the process of moisture absorption and dehumidification,there is a big difference in the change rule of the permeability characteristics of loess,and there is a certain hysteresis in the relationship curve between the unsaturated permeability coefficient and the volumetric water content,and the unsaturated permeability coefficient is larger than that of the dehumidification path under the moisture absorption path when the degree of saturation is higher.In the whole seepage process,there is a certain primary and secondary relationship between the migration of water within the pore space,in the hygroscopic stage,the water is prioritized to fill the pore space with smaller pore size,while in the dehumidification stage,the pore space with larger pore size is prioritized to drain.The distribution of pore water is an important factor affecting the unsaturated infiltration of loess,and the influence of water stored in larger pores on the infiltration coefficient is dominant,while the influence of water stored in smaller pores to the infiltration of soil samples is relatively small.关键词
黄土/核磁共振/非饱和渗透/干湿路径/微观机理Key words
loess/nuclear magnetic resonance/unsaturated permeability/wet and dry paths/micromechanisms分类
建筑与水利引用本文复制引用
陈宝,罗锋,尚心悦,邓荣升..干湿路径下非饱和黄土渗透特性及微观机理研究[J].路基工程,2024,(2):1-8,8.基金项目
国网河南省电力公司科技项目:黄河流域特殊地质下输变电工程设计关键技术研究及应用(5217L0230008) （5217L0230008）
