沙漠大温差区半刚性基层温度应变特性研究

Research on Temperature Strain Characteristics of Semi-rigid Base in Desert Regions with Large Temperature Differences

以S21阿乌公路建设工程二期项目为依托,通过现场监测得到水泥稳定碎石基层温度及应变数据,对极端高温和极端低温条件下的温度及应变数据进行分析,拟合得到高温及低温条件下基层内部不同深度及不同方向的温度应变系数。结果表明:水稳碎石基层内,上下层温度受气候温度影响的变化趋势基本一致,上层温度敏感性略高于下层;长期来看,水泥稳定碎石基层内应变以纵向应变为主,且极端高温下应变变化幅度更大,极端低温下水泥稳定碎石基层出现冻胀现象。

Based on the project of the second phase of S21 Awu highway construction engineering,the temperature and strain data of the cement stabilized crushed stone base are obtained through the on-site monitoring.The temperature and strain data under the extreme high and low temperature conditions are analyzed,and the temperature strain coefficients at different depths and directions inside the base under high and low temperature conditions are fitted.The results show that:the temperature changes of the upper and lower layers in the cement stabilized crushed stone base are basically the same under the influence of climate temperature,and the temperature sensitivity of the upper layer is slightly higher than that of the lower layer.In the long run,the internal strain of cement stabilized crushed stone base is mainly longitudinal strain,and the strain change is greater under the extreme high temperature.Frost heave phenomenon occurs in the cement stabilized crushed stone base under the extreme low temperature.