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Abstract Laboratory tests on the large post-liquefaction deformation of saturated Nanjing fine sand were performed by using a hollow cylinder apparatus. The stress-strain relationship and the characteristics of excess pore water pressure after liquefaction were studied. It is found that the relationship between deviatoric stress and axial strain presented a sigmoid curve；and there is a good linearity relationship between normalized pore water pressure and deviatoric stress. On this basis，a constitutive model of stress-strain relationship and a dissipation model of excess pore water pressure are established. It is found that the results predicted by the two models are in good agreement with the experimental data. The influence of relative densities and confining pressure on the characteristics of liquefied soil are studied. The results show that the relative densities and initial effective confining pressure all have an important influence on the stress-strain relationship of liquefied saturated sand. However，the dissipation model of excess pore water pressure after liquefaction is only affected by the confining pressure.
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Received: 18 February 2011
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2011, Vol. 30 
