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Sliding-scale Mohr diagram
301A 935258 Simultaneous pure and simple shear: the unifying deformation matrix Tikoff, B; Fossen, H Tectouophysics V217, N3/4, Jan 1993, P267-283
A new method to combine simple shear and finite pure shear is presented. The result is in the form of a deformation matrix, moving a material point or vector from its initial undeformed position to its final position. The matrix is given only in terms of shortening (extension) components and shear strain components. The direction and magnitude of the strain ellipsoid (ellipse) can be determined at any stage during deformation. The method is applicable to forward modelling of geological processes and an infinite number of deformation paths can be modelled. 935259 Sliding-scale Mohr diagram Passchier, C W Tectonophysics 11218, N4, Feb 1993, P367-373
Mohr diagrams for the position gradient tensor have many applications in analysis of finite strain. For the case of progressive deformation, the conventional Mohr diagram with its series of expanding circles becomes difficult to interpret. As an alternative, the sliding-scale Mohr diagram is presented, with a fixed circle and a mobile reference frame origin which maps the deformation path. This diagram is useful as a teaching tool and for research on kinematics of progressive deformation. 935260 Constitutive equation of a gas-filled two-phase medium Strzelecki, T; Bauer, J, Auriault, J L Trans Porous Media VIO, N2, Feb 1993, P197-202
The homogenization method is used to develop a set of equations governing the consolidation of a medium consisting of a porous elastic skeleton saturated with a highly compressible fluid. Mass and momentum conservation equations and the equation of flow of the pore fluid are presented for the equivalent macroscopic medium. Material constants for coal have been determined in the laboratory.
Design methods 935261 BLASTCAD - Noranda's three-dimensional computer-aided underground blast design system Favreau, P; Andrieux, P CIM Bull V86, N967, Feb 1993, P62-68
Progress in development of a 3D computer-aided blast design system is described. Traditional methods of laying out underground blasts in hard rock mines are first outlined. The BLASTCAD system, developed around the AutoCAD package, is then presented. Program objectives, system requirements, and layout routines are examined. The advantages gained from using such a system and further developments for BLASTCAD are discussed. 935262 Prediction of blast-induced swell by means of computer simulations Favreau, R F CIM Bull V86, N967, Feb 1993, P69-72
Fragmented rock almost always occupies a much greater space than it did before blasting. This degree of swell affects the efficiency of rock removal by shovel or dragline. Geometric
swell and displacement swell are explained and illustrated. A subroutine SWELL, to be included in the blast simulator BLASPA, is described. Results are presented which show effects of various blasting parameters on the degree and distribution of swell within the muckpile. 935263 Development of a 3D geologic model and database for dragline mine planning on a microcomputer Michaud, L H lnt J Surf Min V6, N4, 1992, P179-185
Dragline mine planning requires consideration of many variables, particularly in mountainous terrain with complex topography and geology. To assist the design engineer, a PCbased system incorporating the latest development in 3D graphics and geological modelling has been produced. It utilises the Gridded Seam Model with grid evaluation by the Weighted Moving Average Method. Development of the model is outlined and geologic modelling and its application to mine planning illustrated. 935264 Computer aided UPD - a 3-D dynamic cone approach Mukhopadhyay, S K; Pal, S K; Sharma, P J Min Metal Fuels V40, N8/9, Aug~Sept 1992, P270-274
Ultimate Pit Design, particularly for low grade or inhomogeneous deposits,requires analysis of enormous amounts of data and a computer-based approach is the only realistic method. The use of the 3D dynamic cone method for UPD is demonstrated. Advantages over the moving cone approach and the Lerchs-Grossman algorithm are examined. It is suggested that this approach based on the Wilke and Wright algorithm overcomes the degeneration problem of the Koenisburg algorithm. 935265 Using geostatistical software to manage panel caving operations Rech, W D; Jensen, E B; Hauk, G; Stewart, D R Min Engng V45, N3, March 1993, P239-245
Diamond drillhole data used to model the mineral content of ore for economic evaluation are rarely in a form suitable for use in analysis and solution of practical problems in the field. At the Henderson mine, the geostatistical data have been input into the standard mine design and planning computer packages. Such properties as degrees of argillization or silification can be taken into account in production planning, and optimization of rock support costs is possible. 935266 Rock engineering mechanisms information technology (REMIT): Part I - the basic method: Part !I - illustrative case examples Hudson, J A; Arnold, P N; Tamai, A Proc 7th ISRM International Congress on Rock Mechanics, Aachen, 16-20 September 1991 V2, P1113-1119. Publ Rotterdam: A A Balkema, 1991
The REMIT methodology is introduced, which aims to identify relevant rock engineering parameters and their interactions. Characterisation of the intact rock, discontinuities, rock mass, and site and project parameters should be driven by the engineering objective together with associated instability mechanisms. The basic techniques and the interaction matrix concept are described, and specific applications to large underground structures and pressure tunnels are illustrated.
© 1993 Pergamon Press Ltd. Reproduction not permitted
A new method to combine simple shear and finite pure shear is presented. The result is in the form of a deformation matrix, moving a material point or vector from its initial undeformed position to its final position. The matrix is given only in terms of shortening (extension) components and shear strain components. The direction and magnitude of the strain ellipsoid (ellipse) can be determined at any stage during deformation. The method is applicable to forward modelling of geological processes and an infinite number of deformation paths can be modelled. 935259 Sliding-scale Mohr diagram Passchier, C W Tectonophysics 11218, N4, Feb 1993, P367-373
Mohr diagrams for the position gradient tensor have many applications in analysis of finite strain. For the case of progressive deformation, the conventional Mohr diagram with its series of expanding circles becomes difficult to interpret. As an alternative, the sliding-scale Mohr diagram is presented, with a fixed circle and a mobile reference frame origin which maps the deformation path. This diagram is useful as a teaching tool and for research on kinematics of progressive deformation. 935260 Constitutive equation of a gas-filled two-phase medium Strzelecki, T; Bauer, J, Auriault, J L Trans Porous Media VIO, N2, Feb 1993, P197-202
The homogenization method is used to develop a set of equations governing the consolidation of a medium consisting of a porous elastic skeleton saturated with a highly compressible fluid. Mass and momentum conservation equations and the equation of flow of the pore fluid are presented for the equivalent macroscopic medium. Material constants for coal have been determined in the laboratory.
Design methods 935261 BLASTCAD - Noranda's three-dimensional computer-aided underground blast design system Favreau, P; Andrieux, P CIM Bull V86, N967, Feb 1993, P62-68
Progress in development of a 3D computer-aided blast design system is described. Traditional methods of laying out underground blasts in hard rock mines are first outlined. The BLASTCAD system, developed around the AutoCAD package, is then presented. Program objectives, system requirements, and layout routines are examined. The advantages gained from using such a system and further developments for BLASTCAD are discussed. 935262 Prediction of blast-induced swell by means of computer simulations Favreau, R F CIM Bull V86, N967, Feb 1993, P69-72
Fragmented rock almost always occupies a much greater space than it did before blasting. This degree of swell affects the efficiency of rock removal by shovel or dragline. Geometric
swell and displacement swell are explained and illustrated. A subroutine SWELL, to be included in the blast simulator BLASPA, is described. Results are presented which show effects of various blasting parameters on the degree and distribution of swell within the muckpile. 935263 Development of a 3D geologic model and database for dragline mine planning on a microcomputer Michaud, L H lnt J Surf Min V6, N4, 1992, P179-185
Dragline mine planning requires consideration of many variables, particularly in mountainous terrain with complex topography and geology. To assist the design engineer, a PCbased system incorporating the latest development in 3D graphics and geological modelling has been produced. It utilises the Gridded Seam Model with grid evaluation by the Weighted Moving Average Method. Development of the model is outlined and geologic modelling and its application to mine planning illustrated. 935264 Computer aided UPD - a 3-D dynamic cone approach Mukhopadhyay, S K; Pal, S K; Sharma, P J Min Metal Fuels V40, N8/9, Aug~Sept 1992, P270-274
Ultimate Pit Design, particularly for low grade or inhomogeneous deposits,requires analysis of enormous amounts of data and a computer-based approach is the only realistic method. The use of the 3D dynamic cone method for UPD is demonstrated. Advantages over the moving cone approach and the Lerchs-Grossman algorithm are examined. It is suggested that this approach based on the Wilke and Wright algorithm overcomes the degeneration problem of the Koenisburg algorithm. 935265 Using geostatistical software to manage panel caving operations Rech, W D; Jensen, E B; Hauk, G; Stewart, D R Min Engng V45, N3, March 1993, P239-245
Diamond drillhole data used to model the mineral content of ore for economic evaluation are rarely in a form suitable for use in analysis and solution of practical problems in the field. At the Henderson mine, the geostatistical data have been input into the standard mine design and planning computer packages. Such properties as degrees of argillization or silification can be taken into account in production planning, and optimization of rock support costs is possible. 935266 Rock engineering mechanisms information technology (REMIT): Part I - the basic method: Part !I - illustrative case examples Hudson, J A; Arnold, P N; Tamai, A Proc 7th ISRM International Congress on Rock Mechanics, Aachen, 16-20 September 1991 V2, P1113-1119. Publ Rotterdam: A A Balkema, 1991
The REMIT methodology is introduced, which aims to identify relevant rock engineering parameters and their interactions. Characterisation of the intact rock, discontinuities, rock mass, and site and project parameters should be driven by the engineering objective together with associated instability mechanisms. The basic techniques and the interaction matrix concept are described, and specific applications to large underground structures and pressure tunnels are illustrated.
© 1993 Pergamon Press Ltd. Reproduction not permitted