Experimental Analysis On Frost Heaving And Water Transference Of Remolded Silty Clay

City Changchun is located in the geographical center of northeast China,the winter there is especially long,the frozen period could last for 5 months.According to the more than 50 years' meteorological statistics during 1956-2018 from national standard climatological stations in Changchun,the lowest temperature-36.5?appears in 1970,the change of ground temperature is stable overall,the lowest temperature-46.6? appears in 2001,frozen depth turns out to be decreasing year by year,the maximum frozen depth is 169 mm in the year of 1984,and the minimum frozen depth is 102 mm in 2015,the coldest month is January and the average temperature is about-15?.Months of cold will cause frost heaving of the land,and then lead to roadbeds damage and building foundation cracking.Based on the fact that the silty clay in this area is very rich and widely spread,so it's meaningful to conduct the experimental analysis on frost heaving and water transference of remolded silty clay,it means a lot to engineering construction in seasonal frozen area and does great help for preventing the frozen damage.This study took the silty clay from one sample point in Jingyue District,Changchun City,Jilin province as research object and did a series of research in laboratory,and made the test on basic physical parameters including liquid limit and plastic limit,the maximum dry density and granular component and so on.Providing helps and reference to confirm the control conditions of the following testing preparation,such as temperature,water content and compaction.Conducted the test and research on the freezing temperature,explored how different conditions influence the freezing temperature,conducted the test on the content of unfrozenwater with NMR method,used nuclear magnetic resonance technology to find out how different factors influence the content of unfrozen water,and forecast the content of unfrozen water in two ways.Conducted gradient tests on the inside temperature of the soil,explored the drop position and rate under different conditions,and analysis the influence factor of temperature when the soil appeared to be stable finally.Designed the layered frost heaving in closed system,explored the frost heaving character of silty clay under different granular component,temperature and water content.Conducted the test on water transference of silty clay under unidirectional freezing in closed system,observe and analysis the character of water transference in soil.And forecast the frost heaving content in different depth under different conditions with artificial neuron net.