PDF(Pubmed)
Abstract：
The presence of ice-layers in the subgrade soils makes the hydrothermal state of road subgrade built in island permafrost regions more susceptible to external environmental influences. In order to deepen the study of the ice-layers subgrade, a hydrothermal study of subgrade under constant temperature and dynamic loading was carried out. It was found that dynamic loading can change the temperature, moisture and pore water pressure distribution. Under dynamic loading, the hydrothermal and pore water pressure state of the soil in the upper part of the ice layer changed significantly at the beginning of the test. The application of dynamic loads alters the spatial distribution of pore water pressure in the soil, resulting in pressure differences between different areas, which affects the migration of moisture and ultimately leads to the formation of areas with higher moisture content in the area below the load. However, the reduction in soil temperature will weaken the effect of the load, therefore, the temperature of the soil should be controlled for frozen subgrade with ice-layers to prevent the accumulation of moisture in the soil.
摘要：
路基土壤中冰层的存在使在多年冻土地区建造的道路路基的热液状态更容易受到外部环境的影响。为了加深对冰层路基的研究,进行了恒温动荷载作用下路基的水热研究。发现动态加载可以改变温度，水分和孔隙水压力分布。在动态加载下，测试开始时，冰层上部土壤的热液和孔隙水压力状态发生了明显变化。动荷载的作用改变了土体中孔隙水压力的空间分布,导致不同地区之间的压力差异，影响水分的迁移，最终导致在负荷以下区域形成水分含量较高的区域。然而,土壤温度的降低会削弱荷载的影响，因此,对于有冰层的冻结路基，应控制土壤的温度，以防止土壤中水分的积累。
