Model Test Investigation of Pipe-Soil Interaction under Frost Heave Conditions of Roadbed

Exploring the interaction of pipe-soil under frost heave effect is the key to solving the problem of frequent damage to buried pipes. In this study, the effects of ambient temperature (AT), buried depth of pipe (BDP) and initial water content (IWC) on the interaction of pipe-soil under the condition of roadbed frost heave are studiedby experimental test. The results show that the buried pipe seriously affects the soil temperature field and the migration of pore water during roadbed frost heaving. As the AT decreases, the final strain of pipes (FSP) gradually increases, and the flatness of the roadbed gradually deteriorates. When the BDP is 2D (outer diameter of the pipe), the flatness of the roadbed is the worst. The pore water in unfrozen area tends to migrate more toward soil around pipes during the roadbed frost heaving. The IWC of roadbed has a greater impact on the FSP than the BDP These could provide a guidance for the construction of pipes under frost heave in roadbed.