Water Hot Stress Coupled Of Permafrost Subgrade In The Seasonal Frozen Soil Area And Frost Monitoring

China is the third largest permafrost countries around the world, the permafrost area accounts for 70% of the land area. In fact, divided into permafrost and seasonal frozen soil. With the study of the Qinghai Tibet Railway permafrost has made great progress, but the research in the seasonal frozen soil area is relatively less. With the implementation of the national strategy to revitalize the northeast old industrial base, put forward higher request more and more to the railroad and the highway network construction. Seasonal frozen soil subgrade in the case of temperature variation, the stress state is very complex, many factors influence. Among them, three field coupling effect of water-heat-stress is the main factor. Effect of water-heat-stress coupled three fields on the stability of the embankment is one of the methods to solve the permafrost area road frost heave.This paper has finished the following goals:1. By the coupled model of the three field coupling effect of water- heat – stress gives the theoretical derivation.2. By the powerful function of COMSOL, the multi field coupling numerical simulation software, the three field coupling model of water- heat –stress is studied by numerical simulation.3. Through the test, monitoring field, a freeze frost heave test on a top surface monitoring of Permafrost Subgrade Frost heave, made the first hand data.4. he parameters to obtain the height of soil and indoor soil tests of different observation points are selected monitoring test.5. The simulation results were compared with field observation data and numerical analysis of frost heave, verify the reliability of numerical simulation.