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Fracture mechanics of layered rocks
84A
Subjects Peripheral to Geomechanics 872317 Modeling of a liquid phase geothermal doublet system at Regina, Saskatchewan, Canada Hutchence, K; Weston, J H; Law, A G; Vigrass, L W; Jones, F W Water Resour Res V22, NIO, Sept 1986, P1469-1479 A mathematical model is used to describe the temperature disturbance resulting from a sedimentary-basin type geothermal project, where hot water is extracted from the production well and cooled water is injected into a nearby disposal well in the same formation. The main aim was to determine an appropriate well spacing for a Canadian project. Effective life expectancy of a doublet well system is evaluated for various reservoirs, pumping rates, and seasonal or continuous pumping.
Fracture mechanics
and parallelopiped specimens were tested. The last described specimens had the schistocity plane at an angle of about 30 deg to the uniaxial loading, and post rupture behaviour was examined. The critical stress intensity factor was the same in both modes, but energy release rate was larger in mode II than in mode I. Crack tip behaviour is seen to differ with respect to loading mode. Intense microcracking occurred, especially in mode II. 872319 Fracture mechanics of layered rocks Kuruppu, M D; Chong, K P Proc 5th Engineering Mechanics Division Speciality Conference, Wyoming, 1-3 Aug 1984 V2, P1428-1432. Publ New York: ASCE, 1984 The fracture mechanics of anisotropic layered material such as oil shale is not well understood. Because of the nature of such materials, their crack geometries are general in nature, and the use of numerical rather than analytical methods is more appropriate for their study. The use of special finite elements to represent singularities at crack tips and of strain energy methods are prominent. Innovative methods, using disc and half-disc specimens to determine the fracture mechanics parameters for input into numerical methods, are described.
872318 Crack propagation under mode I and II loading in slate schist Laqueche, H; Rousseau, A; Valentin, G Int J Rock Mech Min Sci V23, N5, Oct 1986, P347-354 Laboratory measurement of the fracture energy of a brittle orthotropic rock-slate schist in the opening and shear modes is described. Double cantilever beam, compact notched shear,
© 1986 Pergamon Journals Ltd. Reproduction not permitted
Subjects Peripheral to Geomechanics 872317 Modeling of a liquid phase geothermal doublet system at Regina, Saskatchewan, Canada Hutchence, K; Weston, J H; Law, A G; Vigrass, L W; Jones, F W Water Resour Res V22, NIO, Sept 1986, P1469-1479 A mathematical model is used to describe the temperature disturbance resulting from a sedimentary-basin type geothermal project, where hot water is extracted from the production well and cooled water is injected into a nearby disposal well in the same formation. The main aim was to determine an appropriate well spacing for a Canadian project. Effective life expectancy of a doublet well system is evaluated for various reservoirs, pumping rates, and seasonal or continuous pumping.
Fracture mechanics
and parallelopiped specimens were tested. The last described specimens had the schistocity plane at an angle of about 30 deg to the uniaxial loading, and post rupture behaviour was examined. The critical stress intensity factor was the same in both modes, but energy release rate was larger in mode II than in mode I. Crack tip behaviour is seen to differ with respect to loading mode. Intense microcracking occurred, especially in mode II. 872319 Fracture mechanics of layered rocks Kuruppu, M D; Chong, K P Proc 5th Engineering Mechanics Division Speciality Conference, Wyoming, 1-3 Aug 1984 V2, P1428-1432. Publ New York: ASCE, 1984 The fracture mechanics of anisotropic layered material such as oil shale is not well understood. Because of the nature of such materials, their crack geometries are general in nature, and the use of numerical rather than analytical methods is more appropriate for their study. The use of special finite elements to represent singularities at crack tips and of strain energy methods are prominent. Innovative methods, using disc and half-disc specimens to determine the fracture mechanics parameters for input into numerical methods, are described.
872318 Crack propagation under mode I and II loading in slate schist Laqueche, H; Rousseau, A; Valentin, G Int J Rock Mech Min Sci V23, N5, Oct 1986, P347-354 Laboratory measurement of the fracture energy of a brittle orthotropic rock-slate schist in the opening and shear modes is described. Double cantilever beam, compact notched shear,
© 1986 Pergamon Journals Ltd. Reproduction not permitted