The highway and railway subgrade built in permafrost and seasonally frozen regions will not only be damaged by freezing and thawing, but also affected by dynamic load. However, there are little apparatus that have both freeze-thaw and dynamic loading functions. In order to study the stability of subgrade under dual effects, the apparatus that can apply freeze-thaw and dynamic load on subgrade has been developed. The verification test was carried out to verify the functional reliability of the apparatus. The test proved that the apparatus can simulate the dual effects of freeze-thaw and dynamic load, and on this basis, it can realize the monitoring functions of temperature, water, pore water pressure and deformation. Further, the apparatus runs stably and reliably, with accurate results and simple operation. It is considered to be a promising tool for studying the stability of subgrade in permafrost and seasonally frozen regions under the dual effects of freeze-thaw and dynamic load.

建在多年冻土区和季节性冻土区的公路、铁路路基，不仅会受到冻融破坏，还会受到动荷载的影响。然而，很少有设备同时具有冻融和动态加载功能。为研究双重作用下路基的稳定性，研制了可对路基施加冻融和动荷载的装置。进行了验证测试，以验证设备的功能可靠性。试验证明，该装置可以模拟冻融和动荷载的双重作用，并在此基础上实现温度、水量、孔隙水压力和变形等监测功能。并且，该装置运行稳定可靠，结果准确，操作简单。