冻土热交换系数及冻结强度试验分析

Experimental determination on heat exchange coefficient and freezing strength of frozen soil

采用稳态比较法,自行研制室内冻土导热系数测定装置,并开展了温度、含水量对冻土导热系数的影响研究。结果表明,原状土的导热系数略小于重塑土的导热系数。依据《土工试验方法标准》（GB/T 50123—1999）,进行混凝土与冻土间的冻结强度试验。试验结果表明,冻结力随着位移变化经过两个阶段：强化阶段与弱化阶段。

By using steady state comparison method,special experimental setup was developed to measure coefficient of thermal conductivity of indoor frozen soil. Then the influences of temperature and water contents on thermal conductivity coefficient of frozen soil were analyzed. It was found that the thermal conductivity coefficient of undisturbed soil was slightly smaller than that of disturbed soil. The freezing strength test between concrete and frozen soil was conducted based on the Standard for soil test method（ GB/T 50123—1999）. The experimental results show that the relationship between frozen freezing force and displacement can be divided into two stages, which are hardening stage and weakening stage respectively.