膨胀土失水收缩时收缩压的变化规律

The Relationship between the Pressure and the Speed of Collapse in the Course of Collapse of Loess

通过对膨胀土失水收缩过程的分析,根据热力学原理,建立了膨胀土失水收缩过程中收缩压力与土体变形量关系的数学模型。通过试验,确定了模型中的相关参数,得到了收缩压力与土体变形量关系的曲线。根据对模型及图象的分析,指出在膨胀土失水收缩的过程中,收缩压力的变化可分为三个阶段:首先随土体变形量的增大而呈非线性增大,增长速率逐渐增大;然后经过短暂的平稳阶段;最后收缩压力迅速减低,直至达到0值。

On the basis of thermodynamics principle, according to analyzing the expansive soil shrinkage during the course of dehydration, a model of the relationship between the shrinkage pressure and the deforming in the course of dehydration is presented. The parameter of the model was gotton and the relational curve was drewed by experiment. On the basis of analyzing the model and curve, the conclusion is obtained that during the course of dehydration shrinkage, the shrinkage pressure may be divided 3 stage： the first, with increasing of deforming, the shrinkage pressure increased non-linearitily; the second, the shrinkage pressure is constant ; at last, the shrinkage pressure will decrease rapidly.