Analysis of Frost Heaving Characteristics of Silty Clay in Seasonal Frozen Region

Silty clay is frost heaving sensitive soil. In order to study the regularity of frost heave rate varies with moisture content,degree of compaction and freezing temperature,the closed frost heave simulation test of silty clay from Harbin-Daqing second-class road in Heilongjiang Province is conducted. The analysis result shows that( 1) Under single factor of closed frost heaving,the silty clay frost heave rate has relevant relations with the abovementioned 3 factors. Low freezing temperature,high moisture content and high degree of compaction can increase soil frost heave.( 2) The influence of moisture content on frost heave rate is maximum,degree of compaction is the second,and freezing temperature is minimum.( 3) The initial moisture content of frost heave of silty clay is ω0 = 0. 89ωp,the critical moisture content of frost heave is ωc = 0. 97ωp. In addition,based on the test results,the multiple regression analysis models,whose dependent variable is frost heave rate and independent variable are the 3 factors,are established by SPSS statistical software,which can be used in the prediction of frost heave rate of silty clay.