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Report No.

Hydro-Mechanical (HM) response during compression and decompression of hydraulic pressure

Ozaki, Yusuke ; Matsui, Hiroya ; Kohashi, Akio; Onoe, Hironori 

In this study, we introduce the hydro-mechanical behavior observed in the fracture granite medium. The rock deformation due to the change in hydraulic pressure according to the borehole drilling was observed at the 500m stage in Mizunami underground research laboratory. The observed data of rock deformation shows the elastic behavior although the several fractures are observed in the monitoring borehole. We conduct a numerical simulation for the evaluation of this behavior by using finite element methods. The magnitude of simulated deformation is similar value with the observed data. From these results, we conclude that the movement of fracture joints is slight and the subsurface facility is stable to the change in hydraulic response.



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