TY - GEN
T1 - Experimental evaluation of fluid flow through artificial shear fracture in Granite
AU - Watanabe, Noriaki
AU - Hirano, Nobuo
AU - Tsuchiya, Noriyoshi
PY - 2006/12/1
Y1 - 2006/12/1
N2 - Direct shear tests were performed for intact granite samples to prepare specimens containing single shear fractures created under 20, 40, 60 MPa normal stress and 1, 3, 5 mm shear displacement conditions, for flow-through experiments. Shear fractures were successfully created on the constrained fracturing plane. Different normal stress and shear displacement conditions caused different roughness of fracture surfaces. Flow-through experiments were performed for the specimens containing shear fractures under 10-100 MPa confining pressure conditions. In the case of the shear fractures created under 20, 40 MPa normal stress and 1, 5 mm shear displacement conditions, no obvious differences were observed in permeability despite different normal stress and shear displacement conditions. Permeability decreased significantly under low confining pressure conditions (< 40-50 MPa), and then slightly decreased with increasing confining pressure. In the case of the shear fractures created under 60 MPa normal stress and 1, 3, 5 mm shear displacement conditions, on the other hand, permeability differed from the above case. It was observed that permeability decreased drastically under high confining pressure conditions (> 70 MPa). It was also observed that permeability increased clearly with increasing shear displacement condition.
AB - Direct shear tests were performed for intact granite samples to prepare specimens containing single shear fractures created under 20, 40, 60 MPa normal stress and 1, 3, 5 mm shear displacement conditions, for flow-through experiments. Shear fractures were successfully created on the constrained fracturing plane. Different normal stress and shear displacement conditions caused different roughness of fracture surfaces. Flow-through experiments were performed for the specimens containing shear fractures under 10-100 MPa confining pressure conditions. In the case of the shear fractures created under 20, 40 MPa normal stress and 1, 5 mm shear displacement conditions, no obvious differences were observed in permeability despite different normal stress and shear displacement conditions. Permeability decreased significantly under low confining pressure conditions (< 40-50 MPa), and then slightly decreased with increasing confining pressure. In the case of the shear fractures created under 60 MPa normal stress and 1, 3, 5 mm shear displacement conditions, on the other hand, permeability differed from the above case. It was observed that permeability decreased drastically under high confining pressure conditions (> 70 MPa). It was also observed that permeability increased clearly with increasing shear displacement condition.
KW - Coupling
KW - Direct shear test
KW - EGS
KW - Flow
KW - Flow-through experiment
KW - Fluid flow
KW - Fracturing
KW - Granite
KW - Permeability
KW - Shear fracture
KW - Stress
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M3 - Conference contribution
AN - SCOPUS:34248152743
SN - 1604230010
SN - 9781604230017
T3 - Transactions - Geothermal Resources Council
SP - 361
EP - 366
BT - Geothermal Resources Council Transactions - GRC 2006 Annual Meeting
T2 - GRC 2006 Annual Meeting: Geothermal Resources-Securing Our Energy Future
Y2 - 10 September 2006 through 13 September 2006
ER -