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Revised ASTM standard on the description and identification of soils (visual-manual procedure): Technical note
178A results is presented. Crushing is simulated by processing aggregate through a laboratory jaw crusher, handling by agitation at 10% moisture content for 20 minutes and placement by modified AASHTO compaction test. Results overestimate field measurements, therefore the 3 tests are appropriate to indicate maximum fines production in the field. Correlation of results with the Washington degradation test. which determines susceptibility of aggregates to degradation in water, is poor.
884192 Revised ASTM standard on the description and identification of soils (visual-manual procedure): Technical note Howard. A K Geotech lest J VIO, N4. Dec 1987. P229-234 ASTM Practice for Description and Identification of Soils (Visual-Manual Procedure) was significantly revised in 1984. Revisions were made to parallel the recent changes in ASTM Classification of Soils for Engineering Purposes and to reflect current practices used for visual-manual description and identification. Criteria for describing particle shape and for describing cementation of coarse-grained soils were added. Appendices give example written descriptions, procedures for estimating particle size distribution and guidelines for using the system.for materials such as shale, mudstone, crushed rock and slag.
Monitoring rock and soil mass performance See also" 88436 7
884193 Monitoring of stability conditions at Falconbridge's Strathcona Mine Udd, J E; Bharti, S C I M Bulletin 1/80. N908. Dec 1987. P46-53 Monitoring of underground mines enables aversion of potential evelopment of alternative strategies. The Strathcona mine has a Ni-Cu ore bearing breccia bounded by a norite hanging wall and a granite footwall. The history of stability in the mine and needs for monitoring are described. Instruments used for short range monitoring include ground movement monitors to detect separation between important fracture surfaces, load cells, rockbolt load cells, and Gloetzl type earth pressure cells. Extensometers and sloughmeters are used for long term monitoring.
884194 Tensiometer and pore water sampler for vadose zone monitoring Morrison, R D; Szecsody, J E Soil Sci V144. NS. Not, 1987. P367-372 An instrument suitable for monitoring waste disposal sites and general use is illustrated. It functions as a tensiometer until a water sample is required, when a vacuum or pressure is used to transport the sample to the surface. Field testing in wet and dry sands and silt examined factors influencing the response of the tensiometer and the sensitivity to dissolved gas in the water. Calculated tensiometer response times show the unit is more responsive if a pressure transducer replaces the Bourdon gauge.
884195 Instrumentation and monitoring of rock reinforcing systems Strawson, C L R Proc S A N G O R M Syrup: Design o f rock reinforcing: components and systems, Johannesburg. 13 Nov 1987 ['37-46. Publ Johannesburg: South African National Group on Rock Mechanics, 1987 The importance of monitoring rock support systems before. during and after installation is ¢mphasised, since values obtained may be utilised in reinforcing calculations. Young's modulus, uniaxial compressive strength, stress and fracture density of the rock should be measured along with stiffness of the reinforcing elements. Appendices on stress measuring devices, extensometers and support tendon densities are included.
Analysis Techniques and Design Methods See." 884101. 884274. 884301
Stress analysis See also." 884084. 884091. 884217
884196 Coupled beam-boundary element model (In German) Pottier, R Felsbau V5. N4. Not" 1987. P195-199 An efficient, economic computation model using a coupled beam-boundary element (BE-BEM) is presented. The theoretical background is briefly reviewed. Stability analyses of a tunnel using BE-BEM, finite element analysis and the modulus of subgrade reaction method are compared and results discussed. The BE-BEM can handle both discontinuous and continuous media.
884197 Deformation and fracturing behaviour of discontinuous rock mass and damage mechanics theory Kawamoto, T; lchikawa, Y; Kyoya, T Int J Num Anal Meth Geomech VI2, NI. Jan-Feb 1988, PI3O Mechanical behaviour of rock masses is affected by discontinuities. The damage mechanics theory is introduced which allows discontinuities such as joint sets to be characterised by a second order symmetric tensor, the damage tensor, which allows the deformation and fracturing of the rock mass to be examined using continuum mechanics. A finite element numerical procedure is developed and used to apply damage mechanics theory to uniaxial compression, direct shear, and the excavation of an underground cavern.
884198 Large strain theory and its application in the analysis of the cone penetration mechanism Kiousis, P D; Voyiadjis, C Z; Tumay, M T Int J Num Anal Meth Geomech VI2. N1. Jan-Feb 1988, P456O An advanced theory of mechanics which introduces material and geometric nonlinearities is used to examine the bchaviour of soil during cone penetration. It includes the realistic assumption of large strains, and provides a more objective evaluation of cone penetration than currently used theories. It
~: 1988 Pergamon Press pie. Reproduction not permitted
884192 Revised ASTM standard on the description and identification of soils (visual-manual procedure): Technical note Howard. A K Geotech lest J VIO, N4. Dec 1987. P229-234 ASTM Practice for Description and Identification of Soils (Visual-Manual Procedure) was significantly revised in 1984. Revisions were made to parallel the recent changes in ASTM Classification of Soils for Engineering Purposes and to reflect current practices used for visual-manual description and identification. Criteria for describing particle shape and for describing cementation of coarse-grained soils were added. Appendices give example written descriptions, procedures for estimating particle size distribution and guidelines for using the system.for materials such as shale, mudstone, crushed rock and slag.
Monitoring rock and soil mass performance See also" 88436 7
884193 Monitoring of stability conditions at Falconbridge's Strathcona Mine Udd, J E; Bharti, S C I M Bulletin 1/80. N908. Dec 1987. P46-53 Monitoring of underground mines enables aversion of potential evelopment of alternative strategies. The Strathcona mine has a Ni-Cu ore bearing breccia bounded by a norite hanging wall and a granite footwall. The history of stability in the mine and needs for monitoring are described. Instruments used for short range monitoring include ground movement monitors to detect separation between important fracture surfaces, load cells, rockbolt load cells, and Gloetzl type earth pressure cells. Extensometers and sloughmeters are used for long term monitoring.
884194 Tensiometer and pore water sampler for vadose zone monitoring Morrison, R D; Szecsody, J E Soil Sci V144. NS. Not, 1987. P367-372 An instrument suitable for monitoring waste disposal sites and general use is illustrated. It functions as a tensiometer until a water sample is required, when a vacuum or pressure is used to transport the sample to the surface. Field testing in wet and dry sands and silt examined factors influencing the response of the tensiometer and the sensitivity to dissolved gas in the water. Calculated tensiometer response times show the unit is more responsive if a pressure transducer replaces the Bourdon gauge.
884195 Instrumentation and monitoring of rock reinforcing systems Strawson, C L R Proc S A N G O R M Syrup: Design o f rock reinforcing: components and systems, Johannesburg. 13 Nov 1987 ['37-46. Publ Johannesburg: South African National Group on Rock Mechanics, 1987 The importance of monitoring rock support systems before. during and after installation is ¢mphasised, since values obtained may be utilised in reinforcing calculations. Young's modulus, uniaxial compressive strength, stress and fracture density of the rock should be measured along with stiffness of the reinforcing elements. Appendices on stress measuring devices, extensometers and support tendon densities are included.
Analysis Techniques and Design Methods See." 884101. 884274. 884301
Stress analysis See also." 884084. 884091. 884217
884196 Coupled beam-boundary element model (In German) Pottier, R Felsbau V5. N4. Not" 1987. P195-199 An efficient, economic computation model using a coupled beam-boundary element (BE-BEM) is presented. The theoretical background is briefly reviewed. Stability analyses of a tunnel using BE-BEM, finite element analysis and the modulus of subgrade reaction method are compared and results discussed. The BE-BEM can handle both discontinuous and continuous media.
884197 Deformation and fracturing behaviour of discontinuous rock mass and damage mechanics theory Kawamoto, T; lchikawa, Y; Kyoya, T Int J Num Anal Meth Geomech VI2, NI. Jan-Feb 1988, PI3O Mechanical behaviour of rock masses is affected by discontinuities. The damage mechanics theory is introduced which allows discontinuities such as joint sets to be characterised by a second order symmetric tensor, the damage tensor, which allows the deformation and fracturing of the rock mass to be examined using continuum mechanics. A finite element numerical procedure is developed and used to apply damage mechanics theory to uniaxial compression, direct shear, and the excavation of an underground cavern.
884198 Large strain theory and its application in the analysis of the cone penetration mechanism Kiousis, P D; Voyiadjis, C Z; Tumay, M T Int J Num Anal Meth Geomech VI2. N1. Jan-Feb 1988, P456O An advanced theory of mechanics which introduces material and geometric nonlinearities is used to examine the bchaviour of soil during cone penetration. It includes the realistic assumption of large strains, and provides a more objective evaluation of cone penetration than currently used theories. It
~: 1988 Pergamon Press pie. Reproduction not permitted