摘要:
利用冻胀试验装置,对京包、包兰线上冻害频发地段的粉质粘土进行了开敞系统中的一维冻胀试验,分析了不同环境冻结温度下土样冻结和冻胀的全过程。试验结果表明:(1)粉质粘土属冻胀敏感性土,土质加上外界水分的补给是该地区出现冻害的主要原因;(2)环境冻结温度直接影响土样的冻结过程进而对冻胀量产生影响,土样的冻结深度随环境冻结温度的降低而增加,开敞系统中土样的冻胀量随环境冻结温度的降低而减小;(3)土样的冻胀率和冻结速率之间成反比关系,冻结速率非常小的情况下,冻结深度几乎不再增加,但土冻胀率较大。
Abstract:
Through the one-dimensional frost heaving test in open system of silty clay,taken from Beijing to Baotou and Baotou to Lanzhou railway subgrade,the freezing and frost heaving behavior of the soil were analyzed,taking into the consideration of the influence of the cooling temperatures.The following conclusions can be drawn:(1)Silty clay was a kind of soil which was sensitive to frost,soil and the water supplement were the main factors to cause frost damages at that area.(2) Cooling temperature had great influence on the course of freezing and frost of the soil,the depth of freezing increased with the descending of the cooling temperature,while frost heaving decreased with the cooling temperature descending.(3)An inversely proportion relationship existed between the frost heaving ratio and the freezing rate,at the very small freezing rate,the depth of freezing almost had no increase,but the larger frost heaving rate was observed.
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