封闭系统中饱和冻结粘土冻胀率的解析解

冻土冻胀变形是由于土样中的水变成冰,使得土样的孔隙受到法向冻胀力的作用,导致孔隙扩展,土体的冻胀率由孔隙的扩展长度和水变成冰的膨胀率决定。封闭系统中饱和冻结粘土冻胀过程中,孔隙受到冻胀力的作用使得孔隙长轴扩展、短轴膨胀,长轴尖端屈服,致使孔隙的面积增大。通过分析孔隙受到冻胀力的作用而扩展,借助小屈服假设求得冻胀量的解析解。对青藏高原北麓河白青粘土的实验表明,所求得的解析解与实验结果较好地吻合。

Analytic Solution to Frost Heaving Ratio of Saturated Clay under Closed System

The heaving metamorphose of frozen soil comes from the growth of soil cracks which suffer from heaving stress when water in the soil is frozen.Meanwhile,growth length of crack and freezing rate determine the heaving rate of frozen soil.Since porosity subject to heaving stress when saturated clay is freezing,grows brachy-axis is expanded,and yield point appears in micro-axis tip of porosity. As a result,area of porosity dramatically aggrandizes.Resorting fracture mechanics to analyze the mechanism of crack growth and employing minimize yield assumption to deduce the critical length of crack growth,the analytical solution of heaving rate of frozen soil is obtained.Finally,the experiment's result of white soil which was taken from Beiluhe Qinghai-Tibet plateau well inosculates with the analytical solution.