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Study on stability analyses of reinforced embankments based on centrifugal model tests
373A
906407 Full scale testing and numerical analysis for polymer grid reinforced embankment Taki, M; Renge, S; Hachiman, T; Moriok.a, Y; Matsuda, H; Natori, J Proc International Geotechnical Symposium on Theory and Practice of Earth Reinforcement, Fukuoka Kyushu, 5-7 October 1988 P479-484. Publ Rotterdam: A A Balkema, 1988 A full scale earth fill embankment of base width 55m, height 14m was constructed with an unreinforced section and sections with various patterns of geogrid reinforcement in basal sections. Cut slopes were excavated with slope 1:0.5 to height 6m, and 1:0.8 above 6m. Field observations and back analysis by the finite element method are in good agreement. Grid reinforcement resulted in increased strength and decreased deformation.
9O64O8 Study on stability analyses of reinforced embankments based on centrifugal model tests Taniguchi, E; Koga, Y; Yasuda, S; Morimoto, I Proc International Geotechnical Symposium on Theory and Practice of Earth Reinforcement, Fukuoka Kyushu, 5-7 October 1988 P485-490. Publ Rotterdam." A A Balkema, 1988 Stability of embankments and retaining walls of sand reinforced with various lengths and numbers of layers of nonwoven geotextile was examined in centrifuge model tests. Horizontal seismic forces were simulated by tilting the structures, which were loaded vertically. Increases in stability and safety factors were observed. Stability analysis assuming a circular slip surface gave results in good agreement with experimental results.
9064O9 Application of non woven fabrics to embankment of cohesive soil Yunoki, Y; Nagao, A Proc International Geoteclmical Symposium on Theory and Practice of Earth Reinforcement, Fukuoka Kyushu, 5-7 October 1988 P491-496. Publ Rotterdam: A A Balkema, 1988 Geotextiles have been used to reinforce a 20m high cohesive fill slope. Tensile tests for the non-woven fabrics were examined to determine suitable tests which reduce the effects of necking on measured strength. Stability analysis by the slip circle method was used in the design. Action to accelerate the consolidation of the embankment and the use of a toe berm of gravel are recommended to improve stability during construction.
906411 Analytical procedure for evaluating pore-water pressure and deformation of saturated clay ground subjected to traffic loads Hyodo, M; Yasuhara, K Proc 6th International Conference on Numerical Methods in Geomechanics, lnnsbruck, 11-15 April 1988 V1, P653-658. Publ Rotterdam: A A Balkema, 1988 Vehicle running tests were performed on a trial embankment of soft clay and vertical earth pressures monitored. Results are compared with those of the Boussinesq equation and a dynamic finite element analysis which treats the traffic loads as impulsive loads. Variation of pore pressure and shear strain with time for the clay was determined from triaxial cyclic compression tests. These were combined with stresses from the finite element analysis to predict deformation and settlement of the embankment.
Hydraulic structures 906412 Applications of the CPT and the electrical density probe during the construction of the Eastern Scheldt Storm Surge Barrier Nelissen, H A M Proc 1st International Symposium on Penetration Testing, ISOPT-I, Orlando,20-24 March 1988 V2, P881-885. Publ Rotterdam: A A Balkema, 1988 During construction of the barrier, CPTs were used to monitor densities of pier foundations to allow bearing capacity predictions, and soil resistivity surveys used to monitor sand density in filter structures. Field results are presented and their interpretation described.
906413 Flow analysis of clay layer due to berth construction Adachi, T; Oka, F; Mimura, M Proc 6th International Conference on Numerical Methods in Geomechanics, lansbrack, 11-15 April 1988 VI, P697-704. Publ Rotterdam: A A Balkema, 1988 It was necessary to rapidly construct a harbour wall on a very soft clay deposit, with control of lateral flow and consolidation. Finite element analysis using an overstress type elastoviscoplastic constitutive model was used to predict the behaviour. Soft clay was removed and replaced with sand below the position of the caisson wall. Fill was placed behind the wall to form the berth. Sand drains were installed in soft clay immediately behind the quaywall. Numerical predictions of settlement and displacements were in good agreement with observed movement.
Slopes 906410 Reinforced earth bridge abutments Boyd, M S Proc International Geoteclmical Symposium on Theory and Practice of Earth Reinforcement, Fukuoka Kyushu, 5-7 October 1988 P499-503. Publ Rotterdam: A A Balkema, 1988 Reinforced earth abutments function as retaining and load bearing structures. Configurations, design applications and potential failure mechanisms are illustrated. A key factor is compatibility between steel reinforcement and granular fill to allow superposition of load bearing on to retaining functions at design stress levels. Design has evolved from experience of model tests, full scale instrumented structures and finite element analysis.
See also: 906171, 906274
906414 Geomechanics of coal mine waste disposal Williams, D J Aust Geomech N18, Jan 1990, P32-35 Geotechnical problem areas associated with open pit coal mining are identified as short term problems of strip instability and spoil pile failure, long term instability of the final void, rehabilitation, and tailings disposal. Basic properties of coal spoil and those specific to tailings dams are outlined. Alternative railings disposal strategies, such as mixing with coarse waste, underground disposal, or reprocessing, are assessed.
© 1990 Pergamon Press plc. Reproduction not permitted
906407 Full scale testing and numerical analysis for polymer grid reinforced embankment Taki, M; Renge, S; Hachiman, T; Moriok.a, Y; Matsuda, H; Natori, J Proc International Geotechnical Symposium on Theory and Practice of Earth Reinforcement, Fukuoka Kyushu, 5-7 October 1988 P479-484. Publ Rotterdam: A A Balkema, 1988 A full scale earth fill embankment of base width 55m, height 14m was constructed with an unreinforced section and sections with various patterns of geogrid reinforcement in basal sections. Cut slopes were excavated with slope 1:0.5 to height 6m, and 1:0.8 above 6m. Field observations and back analysis by the finite element method are in good agreement. Grid reinforcement resulted in increased strength and decreased deformation.
9O64O8 Study on stability analyses of reinforced embankments based on centrifugal model tests Taniguchi, E; Koga, Y; Yasuda, S; Morimoto, I Proc International Geotechnical Symposium on Theory and Practice of Earth Reinforcement, Fukuoka Kyushu, 5-7 October 1988 P485-490. Publ Rotterdam." A A Balkema, 1988 Stability of embankments and retaining walls of sand reinforced with various lengths and numbers of layers of nonwoven geotextile was examined in centrifuge model tests. Horizontal seismic forces were simulated by tilting the structures, which were loaded vertically. Increases in stability and safety factors were observed. Stability analysis assuming a circular slip surface gave results in good agreement with experimental results.
9064O9 Application of non woven fabrics to embankment of cohesive soil Yunoki, Y; Nagao, A Proc International Geoteclmical Symposium on Theory and Practice of Earth Reinforcement, Fukuoka Kyushu, 5-7 October 1988 P491-496. Publ Rotterdam: A A Balkema, 1988 Geotextiles have been used to reinforce a 20m high cohesive fill slope. Tensile tests for the non-woven fabrics were examined to determine suitable tests which reduce the effects of necking on measured strength. Stability analysis by the slip circle method was used in the design. Action to accelerate the consolidation of the embankment and the use of a toe berm of gravel are recommended to improve stability during construction.
906411 Analytical procedure for evaluating pore-water pressure and deformation of saturated clay ground subjected to traffic loads Hyodo, M; Yasuhara, K Proc 6th International Conference on Numerical Methods in Geomechanics, lnnsbruck, 11-15 April 1988 V1, P653-658. Publ Rotterdam: A A Balkema, 1988 Vehicle running tests were performed on a trial embankment of soft clay and vertical earth pressures monitored. Results are compared with those of the Boussinesq equation and a dynamic finite element analysis which treats the traffic loads as impulsive loads. Variation of pore pressure and shear strain with time for the clay was determined from triaxial cyclic compression tests. These were combined with stresses from the finite element analysis to predict deformation and settlement of the embankment.
Hydraulic structures 906412 Applications of the CPT and the electrical density probe during the construction of the Eastern Scheldt Storm Surge Barrier Nelissen, H A M Proc 1st International Symposium on Penetration Testing, ISOPT-I, Orlando,20-24 March 1988 V2, P881-885. Publ Rotterdam: A A Balkema, 1988 During construction of the barrier, CPTs were used to monitor densities of pier foundations to allow bearing capacity predictions, and soil resistivity surveys used to monitor sand density in filter structures. Field results are presented and their interpretation described.
906413 Flow analysis of clay layer due to berth construction Adachi, T; Oka, F; Mimura, M Proc 6th International Conference on Numerical Methods in Geomechanics, lansbrack, 11-15 April 1988 VI, P697-704. Publ Rotterdam: A A Balkema, 1988 It was necessary to rapidly construct a harbour wall on a very soft clay deposit, with control of lateral flow and consolidation. Finite element analysis using an overstress type elastoviscoplastic constitutive model was used to predict the behaviour. Soft clay was removed and replaced with sand below the position of the caisson wall. Fill was placed behind the wall to form the berth. Sand drains were installed in soft clay immediately behind the quaywall. Numerical predictions of settlement and displacements were in good agreement with observed movement.
Slopes 906410 Reinforced earth bridge abutments Boyd, M S Proc International Geoteclmical Symposium on Theory and Practice of Earth Reinforcement, Fukuoka Kyushu, 5-7 October 1988 P499-503. Publ Rotterdam: A A Balkema, 1988 Reinforced earth abutments function as retaining and load bearing structures. Configurations, design applications and potential failure mechanisms are illustrated. A key factor is compatibility between steel reinforcement and granular fill to allow superposition of load bearing on to retaining functions at design stress levels. Design has evolved from experience of model tests, full scale instrumented structures and finite element analysis.
See also: 906171, 906274
906414 Geomechanics of coal mine waste disposal Williams, D J Aust Geomech N18, Jan 1990, P32-35 Geotechnical problem areas associated with open pit coal mining are identified as short term problems of strip instability and spoil pile failure, long term instability of the final void, rehabilitation, and tailings disposal. Basic properties of coal spoil and those specific to tailings dams are outlined. Alternative railings disposal strategies, such as mixing with coarse waste, underground disposal, or reprocessing, are assessed.
© 1990 Pergamon Press plc. Reproduction not permitted