Variation in Hydraulic Conductivity with Increase in Excess Pore Water Pressure Due to Undrained Cyclic Shear Focusing on Relative Density

Abstract

AbstractThis paper presents the variation in the hydraulic conductivity of a sandy soil with the increase in the excess pore water pressure by conducting falling head permeability tests under undrained cyclic shear while focusing on the relative density of the soil. A pressurized drainage tank with a double-pipe burette for water injection and a standpipe for drainage were newly installed in a hollow torsional shear apparatus. The testing results showed that the hydraulic conductivity remained practically unchanged after consolidation until the excess pore water pressure ratio increased to approximately 0.9 under the cyclic loading. However, when the excess pore water pressure ratio increased above 0.9 owing to the cyclic loading, the hydraulic conductivity rapidly increased regardless of the relative density.KeywordsHydraulic conductivityPermeability testLiquefactionCyclic shear test