非饱和马兰黄土土-水特征曲线研究

Research on Soil-water Characteristic Curve of Unsaturated Malan Loess

本文通过对西气东输管线子长县—永平镇段原状马兰黄土的基本物理力学性质进行试验,分析了非饱和马兰黄土土样的基本性质,并利用2Bar体积压力板仪对该土样的基质吸力和体积含水量进行了研究,得出其土-水特征曲线,同时分别采用Gardner、Fredlund和Xing以及Van Genuchten土-水特征曲线方程对试验数据进行拟合,分析各种方程对试验土样的适宜性,拟合结果表明Van Genuchten提出的土-水特征曲线方程对非饱和马兰黄土具有较好的拟合效果。

This paper carries out a series of tests of physical and mechanical properties of Malan loess in the section from Zichang County to Yongping Town of West-East Gas Pipeline.It analyzes the basic characteristics of loess and,by using 2Bar volume pressure plate,studies the matric suction and volume water content of unsaturated loess and obtains the soil-water characteristic curve（SWCC）.Equations of Gardner,Fredlund and Xing and Van Genuchten are used to fit the experimental data respectively and obtain the fitting curve,so the suitability between the experimental data and equations is analyzed.The results show that the equation of Van Genuchten is the best fitting result to demonstrate the soil-water characteristic curve of Malan loess.