干旱地区黄土包气带水分分布规律  

Moisture distribution of aeration zone of loess in arid region

作　　者：张仁义[1] 顾强康[1] 王乐凡 姜乐[1] 李婉[1] 苏立海[1] 

机构地区：[1]空军工程大学机场建筑工程系,陕西西安710038

出　　处：《长安大学学报（自然科学版）》2014年第5期37-41,共5页Journal of Chang’an University(Natural Science Edition)

基　　金：军队科研项目(BKJ11J)

摘　　要：为了研究干旱地区黄土土基包气带内水分分布状态,依据非饱和渗流理论,研究了干旱地区黄土土基包气带内水分分布规律,得出了水分分布的理论规律,并用3个工程的实测数据验证了该理论规律。研究结果表明:干旱地区降雨量少且大气蒸发能力强,地下水位埋深超过6m时,土基中水分分布可近似处于稳定状态;非饱和渗流理论分析结果表明,正常毛细水带高度等于土基的进气值,包气带内土基的饱和度S与深度z呈幂指数关系;干旱地区的3个黄土工程实测值与包气带水分分布规律吻合度高,相关系数达到0.821~0.981,包气带水分分布规律适用于黄土原状土基和填土土基;依据3个工程实例得到水分分布规律参数α和β值,α在3.40~5.13m之间,β在-1.32^-1.08之间;研究成果能为干旱地区土基水分分布规律的进一步研究与黄土强度变形参数测试时含水量控制提供参考依据。The moisture distribution in the aeration zone of loess in arid region was studied based on the seepage theory of unsaturated soil and was validated by three field tests.The results show that the moisture distribution can be considered as being in the nearly steady state when the groundwater depth is more than 6meters due to the large evaporation and little rainfall in aeration zone.The height of normal capillary water zone is equal to the air-enter value of subgrade,and the relationship between saturation and depth of subgrade in the aeration zone can be expressed as exponential approximation.The test data from field test are consistent with the moisture distribution in the aeration zone,and the correlation coefficient is 0.821-0.981,which reveals that the obtained moisture distribution in the aeration zone can be used for undisturbed and remolded loess.The value of parameterαis between 3.40 and 5.13 meter,and the value of parameterβis between-1.32and-1.08.The conclusion in this paper can provide some reference for further research on the moisture distribution and the moisture controlling of the strength and modulus test of loess in arid area.1tab,4figs,13 refs.

关 键 词：道路工程 黄土 水分分布 包气带 非饱和土 饱和度 土-水特征曲线 

分 类 号：U416.1[交通运输工程—道路与铁道工程]