Experimental study on freezing temperature evolution characteristics of loess contaminated by landfill leachate
Soil freezing temperature is one of the key physical indexes in the analysis of soil freezing process and results,which has great influence on the formation of freezing edge and the determination of freezing depth.In this paper,the variation characteristics of freezing temperature of loess samples with different moisture content,landfill leachate concentration and freeze-thaw cycles are studied by laboratory tests,and the evolution mechanism of freezing temperature of loess contaminated by landfill leachate under different conditions is discussed.The experimental results show that the freezing temperature of the landfill leachate contaminated loess is lower than 0℃,the freezing temperature increases with the increase of water content and gradually approaches 0℃,and the duration of the cooling platform increases with the increase of water content.With the increase of landfill leachate concentration,the freezing temperature of soil and the duration of cooling platform show a downward trend.With the increase of the number of freeze-thaw cycles,the freezing temperature of the soil and the duration of the cooling platform decrease and basically reaches a stable state when the number of cycles is 10.Based on the above test results,the empirical formula of soil freezing temperature change considering water content,landfill leachate concentration and freeze-thaw cycles is fitted,and the variation law of freezing depth is further discussed by numerical simulation method.
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