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Report No.

Variation of hydraulic properties on sedimentary rock due to shear deformation

Goke, Mitsuo*; Ishii, Takashi*; Sanoki, Satoru*; Matsui, Hiroya ; Sugita, Yutaka 

In order to investigate the variation of hydraulic properties on soft rock due to shear deformation, permeability tests were performed on hard shale of the Wakkanai formation by axial flow and radial flow techniques under triaxial compression. The experimental results showed that the axial direction permeability increased to approximately 10 times lager than the initial one in residual strength zone. On the other hand, the radial direction permeability increased remarkably in strain softening zone. The results suggested that a permeability increase could be restrained, if the strain softening is not to be attained in the rock mass surrounding caverns by invention of construction methods.



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