温控条件下压实路基土压缩特性研究

Research on Compressive Characteristics of Compacted Soils under Temperature Control

在我国南方地区夏季高温多雨,冬季温和少雨,路基土受温度影响明显。本文通过温控下的固结试验研究了不同干密度压路基实粉质黏土试样的压缩特性,同时得到了温度对试样屈服应力的影响。试验结果表明:试样饱和后孔隙比变化较小,表明该土样几乎没有膨胀性;试样屈服应力随着干密度的增大而增大,随着温度的升高而减小;通过提出的干密度和温度影响下压缩特性模型验证得到,本文提出的方程对干密度和温度影响下屈服应力关系具有很好的拟合效果。

In southern China, the summer season with a high temperature and rainy, while, mild winter rain. The subgrade soil affected by the temperature significantly. In this paper, the compressive characteristics of silty clay samples with different dry density roadbeds are studied by the consolidation test under temperature control. Meanwhile, the effects of temperature on the yield stress of the specimen was obtained. The results show that the changes of the void ratio after the sample saturation is small, in- dicating that the soil sample has almost no swelling properties. The yield stress of the specimen increases with the increase of the dry density and decreases with the increase of the temperature. It is proved that the equations proposed in this paper can successfully describe the effects of dry density and temperature on the yield stress of the compacted soils.