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Study on Moistening Deformation Characteristic and Structure of Unsaturated Loess in Loess Tableland

ZHOU Ming-ru;WANG Jin-wei;WANG Teng;YANG Xin;Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology;School of Civil Engineering,Lanzhou University of Technology;  
In order to study the moistening deformation characteristics of unsaturated loess in loess tableland area and its relation to structure,the soil samples of a building site in Xifeng district of Qingyang city were selected to study the loess consolidation under different water contents.The relations between collapsibility coefficient and pressure,initial moisture content and initial structural strength were discussed.The study results show that the collapsibility coefficient has a decreasing trend with the increase of initial water content under different soaking pressures.The humectation collapsibility is strong with high pressure,and weak with low pressure.The structural strength of loess decreases with the increase of initial water content.The structural strength of loess decreases quickly at the early stage of water content increasing,and decreases slowly at later stage.The microstructure of loess soil has changed obviously after collapsibility,and a more stable secondary structure is formed.
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