气封闭情况下的非饱和土实用强度试验研究

Experimental Research on the Practical Shear Strength of Unsaturated Soils under the State of Continuous Water with Discontinuous Air

考虑吸力的非饱和土研究较为精确,但吸力量测起来比较困难。以饱和度作为参数的非饱和土实用化研究更有利于工程的实际应用。根据非饱和土的分类,用饱和度作参数法对不同类型的非饱和土分别进行研究,将提高饱和度方法的精确性。针对气封闭情况下的非饱和土,对两种不同类型的土进行不固结不排水剪切试验,发现不同的土样表现出了相同的性质,即粘聚力和内摩擦角随饱和度的变化并没有呈现出相应的规律性,它们的变化主要是由于土的结构性所引起的,并从细观的角度进行分析,验证了试验结果。

It is precise for the study of unsaturated soil to use suction as a parameter. However, that brings much difficulty. Using saturation as a parameter in research on unsaturated soil is more convenient in practical application. According to the classification of unsaturated soil, the method of saturation will improve the precision of research on unsaturated soil. This paper is targeted at unsaturated soils under the state of continuous water with discontinuous air, unconsolidated undrained tests on two different soil specimens are carried out. Different specimens put up different characters, that is, cohesive strength and internal friction angle will not change with different saturation states, their changes are caused by soil structure. A micro-analysis of unsaturated soil also proves test results.