Journal of Shanghai Jiaotong University ›› 2020, Vol. 54 ›› Issue (8): 866-872.doi: 10.16183/j.cnki.jsjtu.2019.106

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Equation for Soil Shrinkage Curve of Clay Considering Soil-Water Adsorption Effect

CHEN Pan1(), XIANG Rui2, WEI Xiaoqi1,3, WEI Changfu1,3, WANG Jili1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
    2. China Communications Urban and Rural Construction Planning and Design Research Institute Co., Ltd., Wuhan 430052, China
    3. Guilin University of Technology, Guilin 541004, Guangxi, China
  • Received:2019-01-04 Online:2020-08-28 Published:2020-08-18


Soil shrinkage occurs with the decrease of water content in soils under dry conditions, which has a great influence on soil cracking, bearing capacity, and slope stability. Hence, it is important to predict soil shrinkage effectively under the change of water content in soils. A novel mathematical equation is proposed for describing the soil shrinkage behavior within the full water content range considering the soil-water adsorption effect. The proposed equation can be used to characterize the soil shrinkage behavior of structural and non-structural clayey soils under dry conditions. An additional parameter is introduced into the proposed equation for characterizing the slope of soil shrinkage in low water content ranges, in which the effect of soil-water adsorption is considered. Only one equation is needed to predict the complete shrinkage behavior from saturated to zero water content conditions, especially for describing the volume change of soils under low water content. The proposed equation has been validated by comparing the results between the predicted curves using the proposed model and the measured data in literatures. Comparing with existing equations for soil shrinkage curve, the results show that the proposed equation can describe the non-zero shrinkage and non-zero shrinkage slope behaviors very well under low water content conditions. Furthermore, the results show that the soil-water adsorption effect is important and necessary for prediction of soil shrinkage behavior under low water content conditions.

Key words: soil shrinkage, volume change, dry conditions, shrinkage slope, unsaturated soil, structural clay

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