冻融循环对路基土物理力学性质影响分析

本文选择了3种典型的东北三省路基粘土作为研究对象，在进行含水率试验、土的密度试验、土的颗粒大小分析试验、土的液、塑限试验、击实试验、土的回弹模量试验等基础上，制作静三轴试件进行试验。试验中，对3种土分别进行了0—8次冻融循环，对其静三轴试验数据进行整理分析发现：冻融作用后土的粘聚力和抗剪强度降低，摩擦角在3种土中变化不一致；随着冻融循环次数的增加，土的力学指标变化趋于平缓；横向来看，3种土由于基本属性参数的不同，受冻融影响在细节方面略有差异，但总体趋势相同。

Effects of Freeze-thaw Cycle on Physical and Mechanical Properties of Subgrade Soil

In this article, three typical kinds of clays in the northeast of China are chosen as the research object. Based on the tests, such as water content test, density test, soil particle size anal- ysis, hydraulic and plastic limit test, the specimens are made to perform triaxial compressive test. 0-8 freeze-thaw cycles are conducted for every kind of clay. The static triaxial data are analyzed, then, the conclusion is drawn that after freeze-thaw cycles, the cohesion stress and the shear strength are reduced, while the friction angle shows different trends among the three kinds of clays. Along with the increase of times of freeze-thaw cycle, the variations of mechanical indexes tend to be less obvious. From another point of view, because of differences of the basic attribute data of the three kinds of soils, the influence of freeze-thaw is different, but the general trend is the same.