Permeability of Granite Including Macro-Fracture Naturally Filled with Fine-Grained Minerals
- 301 Downloads
Information on the permeability of rock is essential for various geoengineering projects, such as geological disposal of radioactive wastes, hydrocarbon extraction, and natural hazard risk mitigation. It is especially important to investigate how fractures and pores influence the physical and transport properties of rock. Infiltration of groundwater through the damage zone fills fractures in granite with fine-grained minerals. However, the permeability of rock possessing a fracture naturally filled with fine-grained mineral grains has yet to be investigated. In this study, the permeabilities of granite samples, including a macro-fracture filled with clay and a mineral vein, are investigated. The permeability of granite with a fine-grained mineral vein agrees well with that of the intact sample, whereas the permeability of granite possessing a macro-fracture filled with clay is lower than that of the macro-fractured sample. The decrease in the permeability is due to the filling of fine-grained minerals and clay in the macro-fracture. It is concluded that the permeability of granite increases due to the existence of the fractures, but decreases upon filling them with fine-grained minerals.
KeywordsPermeability granite fracture clay mineral vein
This work was supported in part by a grant from the Ministry of Economy, Trade and Industry (METI).
- Bear, J. (1988). Dynamics of fluids in porous media. New York: Dover Publications.Google Scholar
- Benson, P., Schubnel, A., Vinciguerra, S., Trovato, C., Meredith, P., & Young, R. P. (2006b). Modeling the permeability evolution of microcracked rocks from elastic wave velocity inversion at elevated isotropic pressure. Journal of Geophysical Research, 111, B04202. https://doi.org/10.1029/2005JB003710.Google Scholar
- Nara, Y., Cho, S. H., Yoshizaki, T., Kaneko, K., Sato, T., Nakama, S., et al. (2011a). Estimation of three-dimensional stress distribution and elastic moduli in rock mass of the Tono area. International Journal of the Japanese Committee for Rock Mechanics, 7, 1–9.Google Scholar
- Sanada, H., Hikima, R., Tanno, T., Matsui, H., & Sato, T. (2013). Application of differential strain curve analysis to the Toki granite for in situ stress determination at the Mizunami underground research laboratory, Japan. International Journal of Rock Mechanics and Mining Sciences, 59, 50–56.CrossRefGoogle Scholar
- Wang, G., Mitchell, T. M., Meredith, P. G., Nara, Y., & Wu, Z. (2016). Influence of gouge thickness on permeability of macro-fractured basalt. Journal of Geophysical Research, 121, 8472–8487.Google Scholar
- Yamamoto, K., Yoshida, H., Akagawa, F., Nishimoto, S., & Metcalfe, R. (2013). Redox front penetration in the fractured Toki granite, central Japan: an analogue for redox reactions and redox buffering in fractured crystalline host rocks for repositories of long-lived radioactive waste. Applied Geochemistry, 35, 75–87.CrossRefGoogle Scholar