【摘要】 通过差式扫描量热法(differential scanning calorimetry,DSC)试验,研究不同初始含水率下黏土在冻融过程中未冻水含量与温度的关系,将融化和冻结过程中冻土未冻水含量的特征点作为参数,建立黏土未冻水含量与温度关系半经验模型,并分析初始含水率对参数的影响。结果表明:模型计算值与试验值吻合较好;初始含水率对黏土冻结时的过冷温度影响较小;完全融化温度随初始含水率增大略有上升;不同初始含水率的相同土质的未冻水含量在同一温度点的变化较小。更多还原

【Abstract】 Through differential scanning calorimetry(DSC) test, the relationship between unfrozen water content and temperature of clay in freezing-thawing process with different initial water content was studied. The characteristic points of the unfrozen water content of the frozen soil during the melting and freezing process were taken as parameters. A semi-empirical model was established for the relationship between unfrozen water content and temperature of clay under different water content, and the influence of initial moisture content on parameters was analyzed. The results show that the calculated values of the model agree well with the experimental values. The initial moisture content has less effect on the sub-cooling temperature of the clay when it freezes. The complete melting temperature increases slightly with the initial water content. The unfrozen water content of the same soil with different initial moisture contents changes less at the same temperature point.更多还原