摘要
以不同初始含水率状态的三原县Q2黄土为对象，经过不同的冻结速度作用后，进行室内试验研究。结果表明：Q2黄土在天然条件下经过冻融后，密度、含水率略有减小，塑限基本不变，液限有所降低，塑性指数减小，而液性指数稍有增加；随着冻结速度的降低，Q2黄土的抗剪强度减小，而压缩性增大。在同一含水率的条件下，随着冻结速度的降低，黏聚力c减小，内摩擦角φ增大；在同一冻结速度条件下，随着含水率的增大，黏聚力c减小，内摩擦角φ先增大后减小；存在一个特征含水率，当含水率小于这一特征含水率时，内摩擦角φ随着含水率的增大而增大，当含水率大于这一特征含水率时，则反之。
Taking different initial moisture conditions of Q2 - loess in SanYuan County as object for laboratory testing, through different freezing rate, the results are： Sanyuan Q2 loess under natural condition after freezing and thawing , the density and the moisture content decrease a little, the plastic limit is essentially as same as before, the liquid limit and plasticity index decreases yet, while the fluid index increased little. With the freezing rate decreasing, the shear strength of Q2 loess decreased, but the compression increased. Under the same moisture content, with the freezing rate decreases, cohesion c decreases, internal friction angle φ increases. When under the same freezing rate, as moisture content increased, cohesion decreases, internal friction angle φ increases firstly and then decreases, because of the existence of a characteristic moisture content. When the moisture content is less than this feature, the internal friction angle φ increases with the moisture content increases. When the moisture content is more than the characteristics moisture content, the results are contrary.
关键词
黄土
试验研究
冻结速度
性状
loess
experimental research
freezing rate
characteristic
