Dynamic effective shear strength of saturated sand |
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Authors: | Shao Shengjun Xie Dingyi |
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Institution: | (1) Xi'an University of Technology, 710048 Xi'an, China |
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Abstract: | The dynamic effective shear strength of saturated sand under cyclic loading is discussed in this paper. The discussion includes
the transient time dependency behaviors based on the analysis of the results obtained in conventional cyclic triaxial tests
and cyclic torsional shear triaxial tests. It has been found that the dynamic effective shear strength is composed of effective
frictional resistance and viscous resistance, which are characterized by the strain rate dependent feature of strength magnitude,
the coupling of consolidation stress with cyclic stress and the dependency of time needed to make the soil strength sufficiently
mobilized, and can also be expressed by the extended Mohr-Coulomb's law. The two strength parameters of the dynamic effective
internal frictional angle φd and the dynamic viscosity coefficient η are determined. The former is unvaried for different number of cyclic loading, dynamic
stress form and consolidation stress ratio. And the later is unvaried for the different dynamic shear strain rate
developed during the sand liquefaction, but increases with the increase of initial density of sand. The generalization of
dynamic effective stress strength criterion in the 3-dimensional effective stress space is studied in detail for the purpose
of its practical use.
The project supported by the National Natural Science Foundation of China (10172070) |
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Keywords: | effective dynamic shear strength effective frictional resistance dynamic viscous resistance saturated sand cyclic loading |
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