陕西省子长地区非饱和马兰黄土的渗透系数曲线研究  

Hydraulic Conductivity Curve of Unsaturated Loess in Zichang Area of Shaanxi Province

作　　者：王晓峰[1] 时红莲[1,2] 刘少科 

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]中国地质大学(武汉)教育部长江三峡库区地质灾害研究中心,湖北武汉430074

出　　处：《水电能源科学》2014年第4期41-45,共5页Water Resources and Power

基　　金：教育部长江三峡库区地质灾害研究中心开放基金项目(TGRC201011);国家自然科学基金项目(41272307)

摘　　要：为研究陕西省子长地区非饱和马兰黄土的渗透特性,对其做了常规物理指标测定试验、X射线衍射试验、变水头渗透试验和土—水特征曲线试验,得到了非饱和黄土的各项物理性质参数、矿物成分及其百分含量、饱和渗透系数以及土—水特征曲线。根据测定数据,结合统计模型计算并绘制了非饱和黄土的K-θ曲线,得出非饱和黄土在脱湿过程中渗透系数在进气值前后随含水率的变化有明显差异。并引入土粒双电层模型,从微观角度解释了非饱和黄土渗透机理,为当地工程的设计施工提供了参考依据。Some laboratory tests were conducted to study the permeability characteristics of unsaturated loess in Zichang area of Shaanxi Province, such as conventional test, X ray diffraction, laboratory permeability test and soil water characteristic curve test. And then it gets the physical properties, mineral composition and its percentage, saturated permeability coefficient and soil water characteristic curve of the loess. The relationship between volumetric water content and hydraulic conductivity is obtained by combining observed data and statistical model. The results showed that there is a significant difference in the relationship between hydraulic conductivity and volumetric water content before and after the air intrusion during the soils off the wet. Finally, the infiltration mechanism of the loess is elaborated by using double electrical layer model of soils. Thus, it provides the basis for local engineering design and construction.

关 键 词：非饱和黄土 渗透系数 土-水特征曲线 统计模型 双电层模型 

分 类 号：TU411.91[建筑科学—岩土工程]