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UBC Theses and Dissertations

Effects of confining pressure and static shear on liquefaction resistance of Fraser river sand Stedman, James David.


A comprehensive investigation into the effects of confining stress and static shear levels on the resistance to liquefaction of Fraser river sand is presented. A wide range of initial states characterized by static shear, confining stress and relative density levels are considered. It is shown that both Kσ and Kα factors that are used to modify the cyclic resistance value at a reference confining stress of 100 kPa and no static shear to account for higher confining stresses and static shear depend on all initial state parameters; density, confining stress and static shear levels. The currently used modifying factors Kσ Kα proposed by Seed and Harder (1990) grossly underestimate the cyclic resistance of Fraser river sand regardless of the magnitude of confining stress, static shear and relative density. The under prediction is the largest for loose density states for which the greatest potential for liquefaction exists.

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