冻融循环作用对粉质粘土回弹模量影响的试验研究

Impact of Freeze-Thaw Cycles on the Resilient Modulus of Silty Clay Soils

以乌鲁木齐市粉质粘土为研究对象,研究了含水率、压实度和冻融循环对回弹模量的影响。在大量实验的基础上,得出了相关土类基本参数、相关曲线、试件制备数据。最后对所得回弹模量试验结果采用正交试验分析方法进行了显著性分析。结果显示：不同类型的土样在历经3~4次循环后,其回弹模量值基本全都趋于稳定。含水率、压实度以及冻融循环作用对回弹模量影响程度排序为：含水率〉冻融循环作用〉压实度。得出了正交试验方法下的最佳组合状态。

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 3-4freeze 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.