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Elastoplastic analysis of jointed rocks using a coupled finite element and boundary element method
76A
ANALYSIS TECHNIQUES:STRESS
952232 Specifying GCLs: a formidable challenge in an emerging industry B. Trauger, Geotechnical Fabrics Report, 12(6), 1994, pp 2830. There is a lack of standardised technical information on geosynthetic clay liners now used in preference to traditional compacted soil liners. The problems of specification are discussed and include product complexity, the accelerating use of this new type of product, mix-and-match specifying from manufacturer's literature, the tendency to overspecify and require exhaustive testing on each geosynthetic clay finer component and on the finished product. There is a need to develop standardised test methods and practices and ASTM have drafted five new standards which will be balloted before their next meeting in January 1995. The properties which need to be specified include design criteria such as permeability, performance under a range of conf'ming stresses and gradients, chemical compatibility, internal and inteffacial shear strength, interface strength characteristics, and index criteria such as free swell and fluid loss, quality and hydraulic performance. (H.C.Barlow)
ANALYSIS TECHNIQUES AND DESIGN METHODS General 952233 Alkalmazhatok-e geostatisztikai modezerek magnetoteUurikns meresek kiertekelcsebeu? (Are geostatistical methods practically applicable in evaluating MT measurement?) F. Lestak, Z. Nagy, A. Thuma & Z. Unger, Magyar Geofizika, 35(1), 1994, pp 28-31. Distributions and entropies of certain parameters are studied and semivariogram analysis was carried out using up at lkI-Iz frequency and from a particular area. This measurement was relevant for the natural magnetic field nevertheless it presents a great deal of variability connected with geophysical anomalies proven before. Several kinds of maps for the distributions of parameters were constructed by means of linear estimation i.e. kriging. (from English summary)
Rock block analysis 952234 Domain decomposition methods for modelling of deformable block structure Z. Dostal, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 185-188. Presents domain decomposition-based algorithms for modelling deformable block systems. It is supposed that the blocks are elastic and that their relation is described by linearized contact conditions. Starting from formulation of the conditions of equilibrium by means of the variational inequality, the algorithm for its solution that exploits solution of subproblems for individual block with either prescribed zero displacement or boundary tractions is presented. (Author)
952235 Towards a methodology for mechanics of underground structures N. S. Bulytchev, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 3-8.
Choice of adequate rock mass models both for stability estimation of underground openings and for design and analysis of support for permanent mine workings and tunnel linings is subject of this paper. Problems of linear or nonlinear models, external and internal plausibility of the analytical or numerical approach, and the required precision of rock mass characteristics determination are discussed. (Author)
952236 A symmetry-bnsed method for kinematic analysis of largeslip brittle fault zones D. S. Cowan & M. T. Brandon, American Journal of Science, 294(3), 1994, pp 257-306. A symmetry-based, statistical method for kinematic analysis of mesoscale fault-zone structures is applied to resolve the transport directions for the Rosario fault zone and Lopez Structural Complex in the San Juan Islands. Individual asymmetric folds and Riedel composite structures consisting of arrays of fault-related planar shear fractures and foliations are represented by an internal rotation axis, which describes the sense of shear and orientation of each structure. The overall deformation in the zone is interpreted as a general non-coaxial shear with monoclinic symmetry. (Author)
952237 Elastoplnstic analysis of jointed rocks using a coupled finite element and boundary element method B. Xiao, J. P. Carter & H. Alehnssein, International Journal for Numerical & Analytical Methods in Geomechanic$, 18(7), 1994, pp 445-466. This paper presents a method for the two-dimensional, nonlinear analysis of anisotropic jointed rock. The behaviour of a jointed rock mass is simulated by representing the mass as an equivalent anisotropic, elastoplastic continuum. Numerical examples are used to verify the capability, accuracy and efficiency of this technique. The technique is also applied to the analysis of tunnel excavation problems in plane strain. The effects of anisotropy and non-linearity of the jointed rock mass during excavation are investigated in some detail. (from Authors)
Stress analysis 952238 Behaviour of composite rock specimens under uniaxial compressive tests O. D. Greco, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 9-16. This study concerns the behaviour of laboratory specimens composed of disks of different rocks in uniaxial compressive tests. The aim of the research was to understand the behaviour of structures, such as stratified rock pillars in underground excavations or masonries in ancient monumenUs, made of different materials. The tests showed a reduction of the disk specimens strength compared with the continuous specimens' strength. It is shown that the failure mechanism of the disk specimens is different from that of each single rock component. (Author)
952239 Quantification of the effective Coulomb and the HockBrown parameters of the pre-reinforeod rock mass A. Mahtab, S. Xu & P. Grasso, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 31-37. The premise is that rock mass pre-reinforcement is equivalent to improving the strength of the rock mass by providing an
ANALYSIS TECHNIQUES:STRESS
952232 Specifying GCLs: a formidable challenge in an emerging industry B. Trauger, Geotechnical Fabrics Report, 12(6), 1994, pp 2830. There is a lack of standardised technical information on geosynthetic clay liners now used in preference to traditional compacted soil liners. The problems of specification are discussed and include product complexity, the accelerating use of this new type of product, mix-and-match specifying from manufacturer's literature, the tendency to overspecify and require exhaustive testing on each geosynthetic clay finer component and on the finished product. There is a need to develop standardised test methods and practices and ASTM have drafted five new standards which will be balloted before their next meeting in January 1995. The properties which need to be specified include design criteria such as permeability, performance under a range of conf'ming stresses and gradients, chemical compatibility, internal and inteffacial shear strength, interface strength characteristics, and index criteria such as free swell and fluid loss, quality and hydraulic performance. (H.C.Barlow)
ANALYSIS TECHNIQUES AND DESIGN METHODS General 952233 Alkalmazhatok-e geostatisztikai modezerek magnetoteUurikns meresek kiertekelcsebeu? (Are geostatistical methods practically applicable in evaluating MT measurement?) F. Lestak, Z. Nagy, A. Thuma & Z. Unger, Magyar Geofizika, 35(1), 1994, pp 28-31. Distributions and entropies of certain parameters are studied and semivariogram analysis was carried out using up at lkI-Iz frequency and from a particular area. This measurement was relevant for the natural magnetic field nevertheless it presents a great deal of variability connected with geophysical anomalies proven before. Several kinds of maps for the distributions of parameters were constructed by means of linear estimation i.e. kriging. (from English summary)
Rock block analysis 952234 Domain decomposition methods for modelling of deformable block structure Z. Dostal, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 185-188. Presents domain decomposition-based algorithms for modelling deformable block systems. It is supposed that the blocks are elastic and that their relation is described by linearized contact conditions. Starting from formulation of the conditions of equilibrium by means of the variational inequality, the algorithm for its solution that exploits solution of subproblems for individual block with either prescribed zero displacement or boundary tractions is presented. (Author)
952235 Towards a methodology for mechanics of underground structures N. S. Bulytchev, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 3-8.
Choice of adequate rock mass models both for stability estimation of underground openings and for design and analysis of support for permanent mine workings and tunnel linings is subject of this paper. Problems of linear or nonlinear models, external and internal plausibility of the analytical or numerical approach, and the required precision of rock mass characteristics determination are discussed. (Author)
952236 A symmetry-bnsed method for kinematic analysis of largeslip brittle fault zones D. S. Cowan & M. T. Brandon, American Journal of Science, 294(3), 1994, pp 257-306. A symmetry-based, statistical method for kinematic analysis of mesoscale fault-zone structures is applied to resolve the transport directions for the Rosario fault zone and Lopez Structural Complex in the San Juan Islands. Individual asymmetric folds and Riedel composite structures consisting of arrays of fault-related planar shear fractures and foliations are represented by an internal rotation axis, which describes the sense of shear and orientation of each structure. The overall deformation in the zone is interpreted as a general non-coaxial shear with monoclinic symmetry. (Author)
952237 Elastoplnstic analysis of jointed rocks using a coupled finite element and boundary element method B. Xiao, J. P. Carter & H. Alehnssein, International Journal for Numerical & Analytical Methods in Geomechanic$, 18(7), 1994, pp 445-466. This paper presents a method for the two-dimensional, nonlinear analysis of anisotropic jointed rock. The behaviour of a jointed rock mass is simulated by representing the mass as an equivalent anisotropic, elastoplastic continuum. Numerical examples are used to verify the capability, accuracy and efficiency of this technique. The technique is also applied to the analysis of tunnel excavation problems in plane strain. The effects of anisotropy and non-linearity of the jointed rock mass during excavation are investigated in some detail. (from Authors)
Stress analysis 952238 Behaviour of composite rock specimens under uniaxial compressive tests O. D. Greco, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 9-16. This study concerns the behaviour of laboratory specimens composed of disks of different rocks in uniaxial compressive tests. The aim of the research was to understand the behaviour of structures, such as stratified rock pillars in underground excavations or masonries in ancient monumenUs, made of different materials. The tests showed a reduction of the disk specimens strength compared with the continuous specimens' strength. It is shown that the failure mechanism of the disk specimens is different from that of each single rock component. (Author)
952239 Quantification of the effective Coulomb and the HockBrown parameters of the pre-reinforeod rock mass A. Mahtab, S. Xu & P. Grasso, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 31-37. The premise is that rock mass pre-reinforcement is equivalent to improving the strength of the rock mass by providing an