人工冻结深厚表土冻胀特性及水热迁移的试验研究

Experimental Study on Freezing Expansion and Water-Heat Transference of Artificially Frozen Deep Overburden Soil

通过自主研发的土体冻融装置,在开放系统下进行了单向冻结深厚表土试验,研究了冷端温度、含水率对土体冻胀及冻结过程中水热迁移的影响规律。结果表明:含水率影响了快速增长阶段的冻胀量和增长减缓阶段的冻胀时间。冻胀率和含水率呈良好的线性关系,开放系统下的土体冻结也可能会发生冻缩现象。

Unidirectional freezing deep overburden soil tests were carried out by soil freezing and thawing apparatus with water supply. The influences of temperature of freezing plate and water content on freezing expansion of soil and water-heat transference were researched. The results show that the water content has almost. The water content affects the frost heave amount in rapid growth stage and the frost heave time in growth slowing stage . The frost heaving rate and water content show a good linear relationship . Under open system, freezing soil may also occur cold shrink phenomenon