title: Experimental investigation of the hydraulic and heat-transfer properties of artificially fractured granite.
abstract: In this paper, the hydraulic and heat-transfer properties of two sets of artificially fractured granite samples are investigated. First, the morphological information is determined using 3D modelling technology. The area ratio is used to describe the roughness of the fracture surface. Second, the hydraulic properties of fractured granite are tested by exposing samples to different confining pressures and temperatures. The results show that the hydraulic properties of the fractures are affected mainly by the area ratio, with a larger area ratio producing a larger fracture aperture and higher hydraulic conductivity. Both the hydraulic apertureand the hydraulic conductivity decrease with an increase in the confining pressure. Furthermore, the fracture aperture decreases with increasing rock temperature, but the hydraulic conductivity increases owing to a reduction of the viscosity of the fluid flowing through. Finally, the heat-transfer efficiency of the samples under coupled hydro-thermal-mechanical conditions is analysed and discussed.
authors.affiliation: China University of Geosciences (Wuhan), Faculty of Engineering &School of Environmental Studies, Wuhan 430074, P.R. China.
authors.forename: Jin
authors.initials: J
authors.lastname: Luo
authors.affiliation: China University of Geosciences (Wuhan), Faculty of Engineering &School of Environmental Studies, Wuhan 430074, P.R. China.
authors.forename: Yongqiang
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: China University of Geosciences (Wuhan), Faculty of Engineering &School of Environmental Studies, Wuhan 430074, P.R. China.
authors.forename: Qinghai
authors.initials: Q
authors.lastname: Guo
authors.affiliation: China University of Geosciences (Wuhan), Faculty of Engineering &School of Environmental Studies, Wuhan 430074, P.R. China.
authors.forename: Long
authors.initials: L
authors.lastname: Tan
authors.affiliation: China University of Geosciences (Wuhan), Faculty of Engineering &School of Environmental Studies, Wuhan 430074, P.R. China.
authors.forename: Yaqin
authors.initials: Y
authors.lastname: Zhuang
authors.affiliation: China University of Geosciences (Wuhan), Faculty of Engineering &School of Environmental Studies, Wuhan 430074, P.R. China.
authors.forename: Mingliang
authors.initials: M
authors.lastname: Liu
authors.affiliation: Huanghe Hydropower Development CO., LTD., State Power Investment Corporation, 810008 Xining, Qinghai, P.R. China.
authors.forename: Canhai
authors.initials: C
authors.lastname: Zhang
authors.affiliation: China University of Geosciences (Wuhan), Faculty of Engineering &School of Environmental Studies, Wuhan 430074, P.R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xiang
authors.affiliation: University of Erlangen-Nürnberg, Geo-Center of Northern Bavaria, Schlossgarten 5, 91054 Erlangen, Germany.
authors.forename: Joachim
authors.initials: J
authors.lastname: Rohn