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Dynamic stability of rock slopes
371A
926247 Updated reference configuration formulation for largedeformation problems Stolle, D F E; Schad, H lnt J Num Anal Meth Geomech V16, N4, April 1992, P295306 Some difficulties encountered in large displacement finite element analysis are examined. While it is possible to model boundary value problems with large displacement or rotation but small strain with confidence, it is still unclear whether results are meaningful in large deformation problems if local deformations deviate significantly from pure stretch. This is important for the case of geological materials which show pressure-sensitive behaviour, since shear-induced volume changes are no longer related solely to plastic strains.
926248 Benchmark algorithm for elastoplasticity with multiple yield surfaces Bardet, J P; Choucair, W Soil Dynam Earthq Engng VIO, N7, Oct 1991, P341-347 A benchmark for calculating constitutive response of elastoplastic models with multiple yield surfaces during cyclic loadings typical of earthquake engineering is presented. The algorithm is based on the linearized integration technique and is applied to Prevost's model, although it is applicable to others. It is used to calculate strain response during a constant pressure test and circular stress path loading in the deviatoric plane. It may be used to calibrate stress-point routines of nonlinear finite element codes, and to compare predictions of elastoplastic models with results from multidimensional shear tests.
926249 Channel Tunnel: numerical models used for design of the United Kingdom undersea crossover Hawley, J; Pottier, R Proc Tunnelling '91, London, 14-18 April 1991 P441-449. Publ London: Elsevier, 1991 Because of the scale of the excavation, numerical models of the UK crossover had to evaluate a wide range of possible circumstances. Two sets of rock parameters were used to represent expected and worst credible conditions. Intact rock and rock mass parameters were used as appropriate in continuum analysis (finite element) and multilaminate analysis (beam element). Three different loading conditions from seepage forces were investigated and two different models used to estimate long term stability.
926250 Dynamic stability of rock slopes Korotkov, P F Proc International Conference on Mechanics o f Jointed and Faulted Rock, Vienna, 18-20 April 1990 P945-949. Publ Rotterdam: A A Balkema, 1990
A model based on elastic-plastic theory has been developed for analysing gradual shear failure of rocks. The formulation of the model utilises the Prandtl-Reiss equations. The theory of fracture mechanics is used to incorporate the growth of cracks in the model. The results have been compared with those from laboratory tests and were found to be in agreement.
Design methods See also: 926267
926251 Graphical post-processor for computer-aided design of mine excavations. Technical note Beer, G; Lang, G Int J Rock Mech Min Sci 1/29, N3, May 1992, P307-322 Numerical models used to simulate rock masses produce large amounts of information which in its raw form is not easily interpreted by the design engineer. To allow 3D visualisation of stresses, plastic points, and displacements around underground openings, the computer package FEMVUE has been developed. It is a graphical post-processor for the code FEMCAD, with which it shares many features. It can run on a range of workstation hardware. Wire frame, solid model, surface contour, or vector displays are possible. Examples are presented.
926252 Computer design of open pit slope and design of reinforcement for planar failure Afrouz, A; Fu, X Int J Surf Min V5, N4, 1991, P177-183 A computer program is described for design of open pit mine slopes with varying water table heights and reinforcement against plane failure. Static and dynamic factors of safety can be obtained with active or passive reinforcement. Design charts are presented for optimisation of slope angle and stability factors. Optimum orientation of the reinforcement is 5-15 deg above the horizontal.
926253 Concepts of dimensional analysis applied to underground engineering geology Indraratna, B; Naguleswary, S Proc 6th International Congress International Association o f Engineering Geology, Amsterdam, 6-10 August 1990 V4, P2593-2599. Publ Rotterdam." A A Balkema, 1990
A methodology based on dimensional analysis has been developed to determine normalized (similitude) quantities for use in physical models and in development of realistic mathematical models. This procedure reduces the number of terms required for proper experimental design. Applications to modelling stress strain behaviour in underground structures are illustrated and extensions discussed. An appendix presents the computer program D A G E for complex dimensional analysis, developed during this work.
926254 In search of a design methodology for rock mechanics Bieniawski, Z T Rock Mechanics as a Multidisciplinary Science, Proc 32nd US Symposium, Norman, 10-12 July 1991 P1027-1036. Publ Rotterdam." A A Balkema, 1991 Only limited attention has been paid to design processes in rock mechanics in the past. The design process is outlined and a multistage design methodology proposed which takes into account the principles of interdependence, minimum uncertainty, simplicity, state-of-the-art heuristics, optimization, and constructibility. The concepts from objective and functional requirements through the creative and design processes, optimization of design, and final realisation in construction are described.
© 1992 Pergamon Press Ltd. Reproduction not permitted
926247 Updated reference configuration formulation for largedeformation problems Stolle, D F E; Schad, H lnt J Num Anal Meth Geomech V16, N4, April 1992, P295306 Some difficulties encountered in large displacement finite element analysis are examined. While it is possible to model boundary value problems with large displacement or rotation but small strain with confidence, it is still unclear whether results are meaningful in large deformation problems if local deformations deviate significantly from pure stretch. This is important for the case of geological materials which show pressure-sensitive behaviour, since shear-induced volume changes are no longer related solely to plastic strains.
926248 Benchmark algorithm for elastoplasticity with multiple yield surfaces Bardet, J P; Choucair, W Soil Dynam Earthq Engng VIO, N7, Oct 1991, P341-347 A benchmark for calculating constitutive response of elastoplastic models with multiple yield surfaces during cyclic loadings typical of earthquake engineering is presented. The algorithm is based on the linearized integration technique and is applied to Prevost's model, although it is applicable to others. It is used to calculate strain response during a constant pressure test and circular stress path loading in the deviatoric plane. It may be used to calibrate stress-point routines of nonlinear finite element codes, and to compare predictions of elastoplastic models with results from multidimensional shear tests.
926249 Channel Tunnel: numerical models used for design of the United Kingdom undersea crossover Hawley, J; Pottier, R Proc Tunnelling '91, London, 14-18 April 1991 P441-449. Publ London: Elsevier, 1991 Because of the scale of the excavation, numerical models of the UK crossover had to evaluate a wide range of possible circumstances. Two sets of rock parameters were used to represent expected and worst credible conditions. Intact rock and rock mass parameters were used as appropriate in continuum analysis (finite element) and multilaminate analysis (beam element). Three different loading conditions from seepage forces were investigated and two different models used to estimate long term stability.
926250 Dynamic stability of rock slopes Korotkov, P F Proc International Conference on Mechanics o f Jointed and Faulted Rock, Vienna, 18-20 April 1990 P945-949. Publ Rotterdam: A A Balkema, 1990
A model based on elastic-plastic theory has been developed for analysing gradual shear failure of rocks. The formulation of the model utilises the Prandtl-Reiss equations. The theory of fracture mechanics is used to incorporate the growth of cracks in the model. The results have been compared with those from laboratory tests and were found to be in agreement.
Design methods See also: 926267
926251 Graphical post-processor for computer-aided design of mine excavations. Technical note Beer, G; Lang, G Int J Rock Mech Min Sci 1/29, N3, May 1992, P307-322 Numerical models used to simulate rock masses produce large amounts of information which in its raw form is not easily interpreted by the design engineer. To allow 3D visualisation of stresses, plastic points, and displacements around underground openings, the computer package FEMVUE has been developed. It is a graphical post-processor for the code FEMCAD, with which it shares many features. It can run on a range of workstation hardware. Wire frame, solid model, surface contour, or vector displays are possible. Examples are presented.
926252 Computer design of open pit slope and design of reinforcement for planar failure Afrouz, A; Fu, X Int J Surf Min V5, N4, 1991, P177-183 A computer program is described for design of open pit mine slopes with varying water table heights and reinforcement against plane failure. Static and dynamic factors of safety can be obtained with active or passive reinforcement. Design charts are presented for optimisation of slope angle and stability factors. Optimum orientation of the reinforcement is 5-15 deg above the horizontal.
926253 Concepts of dimensional analysis applied to underground engineering geology Indraratna, B; Naguleswary, S Proc 6th International Congress International Association o f Engineering Geology, Amsterdam, 6-10 August 1990 V4, P2593-2599. Publ Rotterdam." A A Balkema, 1990
A methodology based on dimensional analysis has been developed to determine normalized (similitude) quantities for use in physical models and in development of realistic mathematical models. This procedure reduces the number of terms required for proper experimental design. Applications to modelling stress strain behaviour in underground structures are illustrated and extensions discussed. An appendix presents the computer program D A G E for complex dimensional analysis, developed during this work.
926254 In search of a design methodology for rock mechanics Bieniawski, Z T Rock Mechanics as a Multidisciplinary Science, Proc 32nd US Symposium, Norman, 10-12 July 1991 P1027-1036. Publ Rotterdam." A A Balkema, 1991 Only limited attention has been paid to design processes in rock mechanics in the past. The design process is outlined and a multistage design methodology proposed which takes into account the principles of interdependence, minimum uncertainty, simplicity, state-of-the-art heuristics, optimization, and constructibility. The concepts from objective and functional requirements through the creative and design processes, optimization of design, and final realisation in construction are described.
© 1992 Pergamon Press Ltd. Reproduction not permitted