Experimental study on thawing subsidence characters of permafrost under frost heaving and thawing circulation

The disease of subgrade in permafrost region was mainly induced by frost heaving and thawing circulation of frozen soils because of change of seasons.Considering the different soils in different test sections of Qinghai-Tibet railway from Golmud to Lhasa,the thawing subsidence characters of frozen soils with different water contents,densities and loads under frost heaving and thawing circulation were studied.The relationship between thawing subsidence coefficient and cyclic thawing subsidence coefficient and the formula were discussed too.All these works were beneficial for deep understanding about thawing subsidence characters.