基于雷诺护垫的高寒多水路基防护结构冻胀适应性模型试验研究

对冻土环境下的输水干渠边坡的雷诺护垫防护工程进行了模型试验,建立比例尺为1∶4的模型,进行两次冻融试验,在试验过程中对雷诺护垫结构段面的冻胀量、冻融过程中土体结构内部温度场分布进行实时监测.试验结果表明:雷诺护垫可以增加热阻,减少能量传递,且护垫下卧土体温度场分布均匀,可有效减小冻深及冻胀量,并抑制不均匀冻胀的发生;在有水份充分补给的条件下,最大冻胀量位置发生在渠底固脚处,其次是渠坡1/3处,设计时应充分考虑该位置的冻胀变形;残余变形最大值在渠底固脚位置,渠坡发生融沉变形,说明雷诺护垫结构本身具有自愈的功能,有比较显著地适应冻融变形的效果.设计及施工过程中要考虑固脚的稳定.

Study on the cold multi-water subgrade protective structure adaptive model based on Renault pad

In this paper,model test was conducted on Renault pad protective engineering of trunk canal slope un-der frozen soil environment.The establishment of the scale was 1:4 model,twice frozen thaw test during the test of frost heave Renault pad segment surface structure,internal structure thaw process temperature distribution in real time.The results showed that:Renault pad can increase resistance,reduce energy transfer,and lying under the soil temperature field distribution pad,which can effectively reduce the amount of frost depth and frost,and suppress the occurrence of uneven frost heave;in there under sufficient water supply conditions,the maximum a-mount of frost occurs in the position at the channel bottom on solid feet,followed by 1 /3 channel slope,the de-sign should take full account of the position of frost heave deformation;maximum residual deformation in a solid channel bottom foot position,channel slope occurs thaw settlement,Renault pad structure itself has described self-healing function,adapt to freeze-thaw more significant effect of deformation.The design and construction process to be considered stable solid foot.