中南大学学报（自然科学版）2017，Vol.48Issue(3)：813-819,7.DOI:10.11817/j.issn.1672-7207.2017.03.032
不同干密度下非饱和土土-水特征曲线
Soil-water characteristic curve for unsaturated soil at different dry densities
摘要
Abstract
Drying and wetting soil-water characteristic curves (SWCCs) for two sandy soils were investigated to research the effects of dry density on the SWCCs and hysteretic behaviors. Drying and wetting SWCCs were obtained for two sandy soils with different dry densities. The test data were best-fitted using the Fredlund and Xing equation. The results show that the fitting parametera increases linearly with the increase of the air-entry value of the SWCC, the fitting parameterm decreases with the increase of the residual suction of the SWCC and the fitting parametern also decreases with the increase of the slope of the SWCC. With the increase of parametera, the air-entry value increases linearly; with the increase of parameterm, the residual suction decreases in power function, and with the increase of parameter n, the slope of drying SWCC decreases in exponential function. The dry density has significant effects on the soil-water characteristic curve. With the increase of dry density, the residual suction, air-entry value and water-entry value increase, and both the slope of drying SWCC and the hysteresis decrease. The hysteresis is mainly attributed to the ink-bottle effect, the contact angle effect and entrapped air.关键词
非饱和土/土-水特征曲线/干密度/滞后现象Key words
unsaturated soil/soil-water characteristic curve/dry density/hysteresis分类
建筑与水利引用本文复制引用
陈宇龙,内村太郎..不同干密度下非饱和土土-水特征曲线[J].中南大学学报（自然科学版）,2017,48(3):813-819,7.基金项目
国家自然科学基金资助项目(10772205) (Project(10772205) supported by the National Natural Science Foundation of China) （10772205）
