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Effects of freezing-thawing on soil aggregates of Pisha sandstone and sand compound soil

ZHANG Hai'ou;HAN Jichang;ZHANG Yang;WANG Huanyuan;Shaanxi Province Land Reclamation Engineering Technology Research Center,Shaanxi Land Construction Group , Key Laboratory of Degraded and Unused Land Consolidation Engineering,Ministry of Land and Resources of China;Institute of Water Resources and Hydro -Electric Engineering,Xi'an University of Technology;  
In order to study the effects of freezing-thaw ing on soil aggregates of Pisha sandstone and sand compound soil,this paper adopted laboratory simulation of freeze-thaw test method,setting up different frequency and clay content.The effect of freezing and thawing cycles,clay content and interaction of the two on soil aggregates of Pisha sandstone and sand compound soil was significant or extremely significant in all fractions.Under freezing-thaw ing frequency,reduce the rate of large soil aggregates first decreased and then increased with the increase of sand percentage in compound soil,and 1:1 compound soil to reduce the rate of the minimum;It was found that freezing-thaw ing reduced the stability of soil aggregate structure,effectively breaking larger aggregate breakdown into small aggregate,so improving Pisha sandstone and sand compound soil.
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