Abstract: The impact of moisture content, degree of compaction and freezethaw cycles on the resilient modulus of silty clay soils are extensively laboratory studied using silty clay soils from Urumqi. The sample preparation details, basic physical properties and relationship curves are obtained. The significance analysis of the test data were statistically analyzed using orthogonal method. The results indicate that the resilient modulus value of samples with the same soil type tend to be stable after 34 freeze thaw cycles. Among the three factors that might impact the resilient modulus, the sequences are: moisture contents, freezethaw cycles and degree of compaction. The moisture content is the largest impact factor and the degree of compact is the lowest.

Key words: Silty Clays, Moisture Contents, Degree of Compaction, FreezeThaw Cycles, Resilient Modulus, Orthogonal Method, Significance Analysis