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Methylene blue test for bentonite liner quality control
112A obtained from the Coulomb equation and (4) the state of active stress propagates down-ward from the soil surface with increasing wall rotation. 843298 Laboratory hehaviour of a reinforced earth wall Narain, J; Saran, S; Talwar, D V Proc lOth International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15-19 June 1981 V3, P753-756. Publ Rotterdam: A. A. Balkema, 1981 Reinforced earth retaining walls may fail by slippage between reinforcing elements and soil due to inadequate anchorage length, depending upon the strength characteristics of soil and surface characteristics and density of reinforcement. This paper presents the results of an experimental investigation on a model reinforced earth retaining wall which was tested to failure due to pullout of reinforcing strips. The variation of tension in strips and state of stress in backfill has been measured and factors of safety against overturning by slippage of reinforcement have been computed. Auth.
Base courses and pavements 843299 Frost action as the cause of dolostouc popouts in asphalt, Kingston, Ontario. Technical note Rogers, C Can Geotech J V20, N3, Aug 1983, P542-546 A portion of Highway 15 in eastern Ontario, Canada, was repaved in 1973 and after some years approximately 10% of the coarse aggregate particles were lost from the surface, leaving 'popouts'. Petrographic examination of these argillaceous dolostone particles was used to determine the source of the rock and it is suggested that the popouts were due to the action of freeze-thaw rather than lack of bond between aggregate particles and asphalt. 843300 Selby diversion of the East Coast Main Line. Part 2. Route design Fenwick, T H Inst Civ Engr Proc V74, Nov 1983, P723-731 The 23.5km long railway diversion is to be constructed south of York, Yorkshire, UK, on flat terrain susceptible to flooding. Where necessary high speed railway embankments of well compacted rock fill will carry the line above the flood plain. Poor ground conditions, soft silts, clays and peat and a requirement for minimum post-construction settlement have necessitated extensive earthquake instrumentation and vertical drainage to accelerate dissipation of pore water pressure and settlements.
Groundwater problems 043301 Methylene blue test for bentonite liner quality control Alther, G R Geotech Test J I/6, N3, Sept 1983, P128-132 An in situ procedure for evaluating the quality of soil and soil/bentonite admix liners is described. Laboratory tests results are presented which show the methylene blue method to be useful in testing the quality of bentonite liners, bentonite slurries and soil bentonite backfills for slurry trenches.
Influence of dynamic loads due to explosions or earthquakes 843302 Propagation of shuck waves at the surface of heterogeneous soil grounds Holzlohner, U; Auersch, L Int J Num Anal Moth Geomech V8, NI, Jan-Feb 1984, P577O The proposed model includes the effects of both damping and heterogeneity. It is concluded that heterogeneity is the main cause of both the elongation of shock into a train of shock waves and the sharp decrease of the vibrations with distance. Hysteretic damping results in an additional decrease. 843303 Geotechnicai problems in offshore earthquake engineering Seines, P B Norw Geotech lnst PuM NI40, 1982, 27P Discusses the differences between offshore and onshore earthquake problems. The presence of water changes the dynamic behaviour of structures and changes the characteristics of earthquake ground motion. Analysis is based on the level of strain developed in soil during the earthquake. Large foundation dimensions of offshore structures increase the importance of out of phase motions of travelling waves. Soil-structure interaction may also have a greater effect offshore due to the large dimensions and added mass of water. 118 refs. 843304 Earthquake-induced slope failure in nonhomogeneous, anisotropic soils Chen, W F; Sawada, T Soils Found V23, N2, June 1983, P125-139 The upper bound technique of limit analysis of perfect plasticity is applied to evaluate the stability of slopes induced by earthquake load. The analysis considers: (1) homogeneous and isotropic slopes, (2) homogeneous but anisotropic slopes and (3) nonhomogeneous and anisotropic slopes. The computer models developed are based on: (1) plane strain, (2) plane and log-spiral failure surfaces, (3) pseudo-static earthquake loading, (4) uniform horizontal distribution of lateral acceleration and (5) the Coulomb criterion for failure with a variable cohesion strength but constant angle between the velocity vector and discontinuous slip surface. 843305 lterative method for seismic stability analysis of three dimensional earth dams Ohmachi, T; Yokoyama, H Soils Found V23, N2, June 1983, P155-164 The proposed method is an extension of the simplified Bishop method, taking into account indeterminate shear force acting between vertical slices transverse to the dam axis. An iterative calculation procedure is presented to determine the magnitude of the interslice shear force and a critical seismic coefficient of the entire dam. Stability analyses were conducted for several earth dam models and the method is concluded to be capable of assessing seismic stability with reasonable accuracy.
Comminution of Rocks See: 843158
Base courses and pavements 843299 Frost action as the cause of dolostouc popouts in asphalt, Kingston, Ontario. Technical note Rogers, C Can Geotech J V20, N3, Aug 1983, P542-546 A portion of Highway 15 in eastern Ontario, Canada, was repaved in 1973 and after some years approximately 10% of the coarse aggregate particles were lost from the surface, leaving 'popouts'. Petrographic examination of these argillaceous dolostone particles was used to determine the source of the rock and it is suggested that the popouts were due to the action of freeze-thaw rather than lack of bond between aggregate particles and asphalt. 843300 Selby diversion of the East Coast Main Line. Part 2. Route design Fenwick, T H Inst Civ Engr Proc V74, Nov 1983, P723-731 The 23.5km long railway diversion is to be constructed south of York, Yorkshire, UK, on flat terrain susceptible to flooding. Where necessary high speed railway embankments of well compacted rock fill will carry the line above the flood plain. Poor ground conditions, soft silts, clays and peat and a requirement for minimum post-construction settlement have necessitated extensive earthquake instrumentation and vertical drainage to accelerate dissipation of pore water pressure and settlements.
Groundwater problems 043301 Methylene blue test for bentonite liner quality control Alther, G R Geotech Test J I/6, N3, Sept 1983, P128-132 An in situ procedure for evaluating the quality of soil and soil/bentonite admix liners is described. Laboratory tests results are presented which show the methylene blue method to be useful in testing the quality of bentonite liners, bentonite slurries and soil bentonite backfills for slurry trenches.
Influence of dynamic loads due to explosions or earthquakes 843302 Propagation of shuck waves at the surface of heterogeneous soil grounds Holzlohner, U; Auersch, L Int J Num Anal Moth Geomech V8, NI, Jan-Feb 1984, P577O The proposed model includes the effects of both damping and heterogeneity. It is concluded that heterogeneity is the main cause of both the elongation of shock into a train of shock waves and the sharp decrease of the vibrations with distance. Hysteretic damping results in an additional decrease. 843303 Geotechnicai problems in offshore earthquake engineering Seines, P B Norw Geotech lnst PuM NI40, 1982, 27P Discusses the differences between offshore and onshore earthquake problems. The presence of water changes the dynamic behaviour of structures and changes the characteristics of earthquake ground motion. Analysis is based on the level of strain developed in soil during the earthquake. Large foundation dimensions of offshore structures increase the importance of out of phase motions of travelling waves. Soil-structure interaction may also have a greater effect offshore due to the large dimensions and added mass of water. 118 refs. 843304 Earthquake-induced slope failure in nonhomogeneous, anisotropic soils Chen, W F; Sawada, T Soils Found V23, N2, June 1983, P125-139 The upper bound technique of limit analysis of perfect plasticity is applied to evaluate the stability of slopes induced by earthquake load. The analysis considers: (1) homogeneous and isotropic slopes, (2) homogeneous but anisotropic slopes and (3) nonhomogeneous and anisotropic slopes. The computer models developed are based on: (1) plane strain, (2) plane and log-spiral failure surfaces, (3) pseudo-static earthquake loading, (4) uniform horizontal distribution of lateral acceleration and (5) the Coulomb criterion for failure with a variable cohesion strength but constant angle between the velocity vector and discontinuous slip surface. 843305 lterative method for seismic stability analysis of three dimensional earth dams Ohmachi, T; Yokoyama, H Soils Found V23, N2, June 1983, P155-164 The proposed method is an extension of the simplified Bishop method, taking into account indeterminate shear force acting between vertical slices transverse to the dam axis. An iterative calculation procedure is presented to determine the magnitude of the interslice shear force and a critical seismic coefficient of the entire dam. Stability analyses were conducted for several earth dam models and the method is concluded to be capable of assessing seismic stability with reasonable accuracy.
Comminution of Rocks See: 843158