压实黄土土水特征曲线

Soil and Water Characteristic Curve of Compacted Loess

土水特征曲线是非饱和土的一个重要的本构特性。通过室内试验测试了压实黄土干化过程的土水特征曲线,讨论了干密度对压实黄土土水特征曲线的影响和不同压实度的压实黄土的非饱和水力学特性。结果表明,不同干密度的压实黄土进气值不同,较大的干密度土体进气值较小;干密度对进气值以后的曲线斜率有很大的影响,干密度较大的压实黄土储水系数较小,非饱和导水率也较小。

Soil and water characteristic curve is an important constitutive feature of unsaturated soil. Through indoor test on soil and water characteristic curve of compacted loess during drying process, a discussion is made on the dry density influence on soil and water characteristic curve as well as the hydraulic property of unsaturated water of compacted oess with different compacting degrees. The result indicates that compacted loess with different dry densities has different air entry values and the soil with higher dry density has less air entry value. Dry density has a major influence on the slope of curve after air entry. Compacted loess with higher dry density has less storage coefficient and less unsaturated hydraulic conductivity.