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《Journal of Glaciology and Geocryology》 2008-04
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Experimental Study of Structure Change of Saline Soils due to Freezing

DENG You-sheng,PU Yi-bin,ZHOU Cheng-lin(State Key Laboratory of Frozen Soil Engineering,CAREERI,CAS.Lanzhou Gansu 730000,China)  
By CT scanning the freezing samples that have different soil types,salts and salt contents,the following experiment results can be seen: in the freezing process,the internal structure of the samples are different for different temperatures and saline soils.As temperature decreasing,the CT scanning sodium chloride saline soil shows that the sample's volume is shrinking and its density increasing;but when the sample begins to freeze,the CT scanning shows that its volume is expanding and its density decreasing with temperature decreasing.To the sodium sulfate saline soil,the CT scanning shows that the sample's volume is expanding and its density decreasing as temperature decreasing;and when the sample begins to freeze,the CT scanning shows that its volume is continuously expanding and its density decreasing more.The capacity of X-ray mass absorption coefficient ranks as silt ≥ salt ≥ clay ≥ water.Salt heaving capacity can affect the sample initial variance(dispersion).So the clay initial variance is more and its salt heaving capacity is less;the silt initial variance is less and its salt heaving capacity is more.In other words,the salt heaving capacity of silt is more than that of clay at the same salt content and temperature.Therefore the soil type and salt content are the major factors to the salt heaving.
【Fund】: 国家自然科学基金项目(40571068)资助
【CateGory Index】: TU448
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