Experimental study on infiltration characteristics of compacted expansive soil
In order to study the infiltration characteristics and laws of expansive soil under different compaction degrees,the seepage test of one-dimensional vertical expansive soil column was carried out with different dry density expansive soil as the research object in a self-made acrylic barrel experimental device,and the influence of different compaction degrees on water transport in expansive soil was analyzed.The results show that:① The infiltration rate,advancing rate of the wetting front,and the compaction degree of expansive soil were negatively correlated.Within the same infiltration time,as the compaction degree increased,the cumulative infiltration amount would decrease and the distance of the wet-ting front advancing would decrease.② The variation pattern of moisture content at each measuring point was similar,with four periods of steady,rapid growth,reaching peak,and maintaining stability.③ As water infiltrated into the soil col-umn,it expanded with a larger expansion at the top and a smaller expansion at the bottom.The expansion phenomenon was consistent with the response of the wetting front,but there was a lag in the expansion phenomenon,which was posi-tively correlated with the compaction degree.The research results can provide a reference for understanding the infiltra-tion characteristics and laws of expansive soils.
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