Hybrid shear and permeability tests were performed on specimens made of Toyoura sand. And, the changes in the permeability due to shear of the sand was investigated. When the shear displacement exceeds 1.6mm, the permeability of sand was increased regardless of dilation or compression of sand volume. The increase rate of hydraulic conductivity was 2.5 times in the loose packing specimen, and in the dense packing specimen it was 2 times.

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