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Orebodies and mine planning 3D modelling
252A 895186
Modemngof concrete response to fluctuating load Jiang, J; Pietruszczak, S lat J Num Anal Meth Geomech VI3, N2. March-April 1989, P171-181 An elastoplastic constitutive model for concrete under cyclic loading is presented, extending the concept of Pietruszczak et al (1988). Initial active loading is described using the rate independent theory of plasticity, and an appropriate hardening/softening parameter introduced to allow modelling of the sensitivity of the material characteristics to varying confining pressures, including a smooth transition from stable to unstable response. Performance of the model is verified for typical cyclic loading histories, and results compared with experimental data.
895187 Plastic-damage model for concrete Lubliner, J; Oliver, J; Oiler, S; Onate, E lnt J Solids Struct V25, N3, 1989, P299-326 A constitutive model based on an internal variable-formulation of plasticity theory is presented for the nonlinear analysis of concrete. A new yield criterion is used. The basic model and an extension to account for elastic stiffness degradation are described. Onset and amount of cracking can be studied by postprocessing of the finite element plasticity solution. Computational implications of the model are discussed and applications illustrated.
895188 Constitutive model for jointed rock mass with orthogonal sets of joints Chen, E P J Appl Mech (Trans ASME Set E) V56, NI. March 1989, 1'25-32 The development and implementation are described of a two dimensional continuum model for jointed rock masses, based on the assumption of strain partitioning among the elastic rock matrix and joint sets with nonlinear normal and shear responses. Rate equations for stress-strain response of the jointed medium are formulated. A numerical incremental solution, implemented into the finite element code JAC, is used to solve sample problems. Interpretation and discussion of results are presented.
895189 Discrete numerical model for soil mechanics Ting, J M; Corkum, B T; Kauffman, C R; Greco, C J Geotech Engng Div ASCE VIIS, N3, March 1989, P379398 The discrete element method (DEM) is a numerical technique which treats the soil as a discrete assemblage of particles. A 2D implementation of DEM which uses disk-shaped particles was verified by numerical simulation of laboratory tests. Results of I-D compression, direct simple shear and triaxial tests show that DEM can simulate nonlinear, hysteretic stressstrain, strength and volume behaviour. The centrifuge modelling principle is used to apply DEM to the full-scale problem, showing accurate simulation of bearing capacity tests on a deep bin of disks.
Design methods See also: 895319 895190 Expert system for regulatory review of hazardous waste surface impoundment dikes Jennings, A A; Heydinger, A G Microcomput Cie Engng V4, NI. March 1989, P29-38 DIKE (2.0) is a microcomputer based expert system used to assist the regulatory review of hazardous waste surface impoundment dykes. It employs 'goal dominated' ES shell architecture. It assists in interpretation of required design information, applies relatively sophisticated engineering analyses to possible design flaws in the embankment, foundations, or liner cover, and helps in the interpretation of computed results. Elements of the procedure applicable to other problems of environmental review are discussed. 895191 Computerized mine planning approach for oil sand operations Badiozamani, K Proc International Symposium on Mine Planning and Equipment Selection, Calgary, 3-4 November 1988 P49-56. Publ Rotterdam: A A Balkema, 1988 A modelling system has been developed for analysis of the very variable McMurray formation. Variable zone modelling is used. This is like conventional block modelling but the blocks are of variable thickness and shape according to geology. The model initially divides into zones based on the depositional environment and then subdivides based on facies and lithology changes. EAGLES, a set of tools to allow interactive modelling of geology and pit design, is described. 895192 Orebodies and mine planning 3D modelling Boyer, A; Billette, N; Boyle, R Proc International Symposium on Mine Planning and Equipment Selection, Calgary, 3-4 November 1988 P63-69. Publ Rotterdam: A A Balkema, 1988 Developments in computer assisted graphical representation of drilling information and orebody modelling are described. Interactive data entry using CDDE/I.0 and an orebody database are outlined. CADD/GEM has been converted to a 2D graphics display modelling of orebodies. Developments in 3-D modelling, geological modelling and mine planning are also described.
Rock Breakage and Excavation 895193 Improved technology and planning in modern stone quarries Bortolussi, A; Ciccu, R; Manca, P P; Massacci, G Proc International Symposium on Mine Planning and Equipment Selection, Calgary, 3-4 November 1988 P107-119. Publ Rotterdam: A A Balkema, 1988 A review of technology available for quarrying of marble and granite is presented. Traditional technologies including rock mass caving, explosive splitting, flame torching, helicoidal wire sawing, slotting with carbide tooth chain, splitting with adjacent drill holes and wedging with mechanical tools or swelling substances are described. More recent developments include
1989 Pergamon Press plc. Reproduction not permitted
Modemngof concrete response to fluctuating load Jiang, J; Pietruszczak, S lat J Num Anal Meth Geomech VI3, N2. March-April 1989, P171-181 An elastoplastic constitutive model for concrete under cyclic loading is presented, extending the concept of Pietruszczak et al (1988). Initial active loading is described using the rate independent theory of plasticity, and an appropriate hardening/softening parameter introduced to allow modelling of the sensitivity of the material characteristics to varying confining pressures, including a smooth transition from stable to unstable response. Performance of the model is verified for typical cyclic loading histories, and results compared with experimental data.
895187 Plastic-damage model for concrete Lubliner, J; Oliver, J; Oiler, S; Onate, E lnt J Solids Struct V25, N3, 1989, P299-326 A constitutive model based on an internal variable-formulation of plasticity theory is presented for the nonlinear analysis of concrete. A new yield criterion is used. The basic model and an extension to account for elastic stiffness degradation are described. Onset and amount of cracking can be studied by postprocessing of the finite element plasticity solution. Computational implications of the model are discussed and applications illustrated.
895188 Constitutive model for jointed rock mass with orthogonal sets of joints Chen, E P J Appl Mech (Trans ASME Set E) V56, NI. March 1989, 1'25-32 The development and implementation are described of a two dimensional continuum model for jointed rock masses, based on the assumption of strain partitioning among the elastic rock matrix and joint sets with nonlinear normal and shear responses. Rate equations for stress-strain response of the jointed medium are formulated. A numerical incremental solution, implemented into the finite element code JAC, is used to solve sample problems. Interpretation and discussion of results are presented.
895189 Discrete numerical model for soil mechanics Ting, J M; Corkum, B T; Kauffman, C R; Greco, C J Geotech Engng Div ASCE VIIS, N3, March 1989, P379398 The discrete element method (DEM) is a numerical technique which treats the soil as a discrete assemblage of particles. A 2D implementation of DEM which uses disk-shaped particles was verified by numerical simulation of laboratory tests. Results of I-D compression, direct simple shear and triaxial tests show that DEM can simulate nonlinear, hysteretic stressstrain, strength and volume behaviour. The centrifuge modelling principle is used to apply DEM to the full-scale problem, showing accurate simulation of bearing capacity tests on a deep bin of disks.
Design methods See also: 895319 895190 Expert system for regulatory review of hazardous waste surface impoundment dikes Jennings, A A; Heydinger, A G Microcomput Cie Engng V4, NI. March 1989, P29-38 DIKE (2.0) is a microcomputer based expert system used to assist the regulatory review of hazardous waste surface impoundment dykes. It employs 'goal dominated' ES shell architecture. It assists in interpretation of required design information, applies relatively sophisticated engineering analyses to possible design flaws in the embankment, foundations, or liner cover, and helps in the interpretation of computed results. Elements of the procedure applicable to other problems of environmental review are discussed. 895191 Computerized mine planning approach for oil sand operations Badiozamani, K Proc International Symposium on Mine Planning and Equipment Selection, Calgary, 3-4 November 1988 P49-56. Publ Rotterdam: A A Balkema, 1988 A modelling system has been developed for analysis of the very variable McMurray formation. Variable zone modelling is used. This is like conventional block modelling but the blocks are of variable thickness and shape according to geology. The model initially divides into zones based on the depositional environment and then subdivides based on facies and lithology changes. EAGLES, a set of tools to allow interactive modelling of geology and pit design, is described. 895192 Orebodies and mine planning 3D modelling Boyer, A; Billette, N; Boyle, R Proc International Symposium on Mine Planning and Equipment Selection, Calgary, 3-4 November 1988 P63-69. Publ Rotterdam: A A Balkema, 1988 Developments in computer assisted graphical representation of drilling information and orebody modelling are described. Interactive data entry using CDDE/I.0 and an orebody database are outlined. CADD/GEM has been converted to a 2D graphics display modelling of orebodies. Developments in 3-D modelling, geological modelling and mine planning are also described.
Rock Breakage and Excavation 895193 Improved technology and planning in modern stone quarries Bortolussi, A; Ciccu, R; Manca, P P; Massacci, G Proc International Symposium on Mine Planning and Equipment Selection, Calgary, 3-4 November 1988 P107-119. Publ Rotterdam: A A Balkema, 1988 A review of technology available for quarrying of marble and granite is presented. Traditional technologies including rock mass caving, explosive splitting, flame torching, helicoidal wire sawing, slotting with carbide tooth chain, splitting with adjacent drill holes and wedging with mechanical tools or swelling substances are described. More recent developments include
1989 Pergamon Press plc. Reproduction not permitted