Modified Duncan-Chang E-B Model of Unsaturated Clay

Abstract:

Accurate in apparatus, complex in operation, expensive in fund and plentiful in time, test of unsaturated soil is difficult. Influence of status of dry and wet and degree of compacting was not considered generally when Duncan-Chang model was be used to unsaturated soil. With parameters of model served as constants, it was not consistent with the practice that parameters would be changed with saturation and water content and its application would be limited. General triaxial tests of drainage and consolidation about dry density and water content combined are carried out, influence of relation between stress and strain about clay is discussed, mathematical equations of parameters of Duncan-Chang model are established, thus modified Duncan-Chang E-B model of unsaturated clay is carried out that influence of dry density and saturation can be considered. From study we can see, on the one hand, characteristics of stress and strain about unsaturated clay are influenced obviously by saturation and dry density, the main parameters of E-B model keep close correction with dry density and saturation, and the both mutual effect can be expressed by multiplication. On the other hand, status of compacting and process of gradual change from dry to wet can be described with modified E-B model. Thus it will be more complete in factors considered, inosculate in practice, and convenient for use.

• Periodical: Applied Mechanics and Materials (Volumes 174-177)
• Pages: 662-667
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.174-177.662
• Online since: May 2012
• Authors: Xi Zhong Shen, Min Zhang, Yan Lan
• Keywords: Dry Density, Duncan-Chang Model, Saturation, Triaxial Test, Unsaturated Soil

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