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Analysis of laterally loaded shafts in rock
50A 931376 Numerical model for analysis of flexible beam-columns on elastic foundations. Technical note Xie, J; Vaziri, H H Comput Geotech VI3, N1, 1992, P51-62
931380 Loss of ground during CFA pile installation in inner urban areas. Technical note Leznicki, J K; Esrig, M ! J Geotech Engng Div ASCE 11118, N6, June 1992, P947-~50
A new method for analysis of flexible beam-columns on elastic foundations is presented. In it, the solution to the problem is divided into a particular solution and four homogeneous solutions. These solutions are evaluated numerically for specified initial boundary conditions. The complete solution is obtained by summing the particular and homogeneous solutions under the constraint that boundary conditions at each end of the beam-column are satisfied. Analysis of a stepped beam-column is illustrated. Buckling of a tapered beam-column is also examined.
Low-vibration, low-noise continuous flight auger plies are often used in settlement-sensitive urban locations. Observations of ground loss during the installation of 27m long, 400mm diameter CFA piles in saturated loose to medium dense, coarse to fine saturated sands are presented. The potential for ground loss exists throughout the installation procedure, but can be minimised by close control of operations and examination of site specific problems at the initial stages. Front-of-wall, spoilless, and mine-piles are suggested for use in addition to CFA piles in urban locations.
931377 Bearing capacity tests on geogrid-reinforced clay Mandal, J N; Sah, H S Geotext Geomem Vll, N3, 1992, P327-333 Tests on square model footings on geogrid-reinforced clay subgrades are described. Load-settlement curves are presented for footings on unreinforced clay and clay with a geogrid layer at a range of depths. Effects of relative depth of the reinforcement (depth/footing size) on bearing capacity ratio (reinforced/unreinforced) and relative reduction in settlement (reinforced/unreinforced) are illustrated. Optimum reinforcement geometry is discussed.
931378 Analysis of laterally loaded shafts in rock Carter, J P; Kulhawy, F H J Geotech Engng Div A S C E Vl18, N6, June 1992, P839-855 The behaviour of flexible and rigid piles socketed into rock and subjected to lateral loading and moments is studied. The finite element method is used to generate parametric solutions for the load-displacement relations, which form the basis for development of simple, approximate, closed-form equations for the practical range of loading conditions and materials properties. Results are in good agreement with available solutions for the limiting cases. An overlying soil layer can be included in the analysis. A method is proposed for prediction of lateral load capacity and applied to back analysis of field tests.
931379 Elastic solutions for arbitrarily shaped foundations. Technical note Li, K S J Geotech Engng Div A S C E Vl18, N6, June 1992, P938-942 Elastic solutions for stresses and deformations caused by foundation loads are available in the form of design charts and tables. These generally consider only regular foundation shapes and cover only a limited range of loading conditions. Manipulations of the standard solutions are often necessary to obtain stresses and deformations at points of interest. To overcome these drawbacks, a method is presented which can calculate the elastic response for arbitrarily shaped foundations with arbitrary stress distributions, using the commercially available computer package MathCAD.
931381 Bearing capacity of improved ground by sand compaction piles Terashi, M; Kitazume, M; Minagawa, S In: Deep Foundation Improvements: Design, Construction, and Testing (Papers to a Symposium presented at Las Vegas, 25 January 1990) P47-61. Publ Philadelphia: ASTM, 1991 ( A S T M Special Technical Publication NI089) The sand compaction pile method is widely used to improve soft clayey coastal deposits in Japan. Because of impracticability of full scale testing, centrifuge model tests were carried out to examine the bearing capacity of improved ground under horizontal and vertical loading. The simple stability analysis commonly used in Japan is able to predict bearing capacity to adequate accuracy. The effectiveness of a simple construction control diagram is demonstrated by observations of ground deformation following its use. The limited full scale data available confirm these results. 931382 Load tests on stone columns Greenwood, D A
In: Deep Foundation Improvements: Design, Construction, and Testing (Papers to a Symposium presented at Las Vegas, 25 January 1990) P148-171. Publ Philadelphia." ASTM, 1991 ( A S T M Special Technical Publication N1089) Stone column foundations are often (incorrectly) regarded as piles and thus tested by direct loading at the ground surface. For single columns, load tests are appropriate, but full scale tests with measurement of soil stresses between columns demonstrate single column results cannot be extrapolated. Stress constraints and load shedding along stone columns are examined. For widespread loads, it is proposed that monitoring of construction techniques and settlement during initial loading form the basis of design. Erratic behaviour can be identified and remedial measures undertaken. 931383 Design and installation of stone columns at Naval Air Station Hayden, R F; Welch, C M
In: Deep Foundation Improvements: Design, Construction, and Testing (Papers to a Symposium presented at Las Vegas, 25 January 1990) P172-184. Publ Philadelphia: ASTM, 1991 ( A S T M Special Technical Publication N1089) Stone columns were installed at the site of a housing project in Nevada, in predominantly sandy soil, to increase bearing capacity, reduce settlement, and mitigate liquefaction potential. Load settlement characteristics were measured in loading tests. CPT and dilatometer tests were used to assess the degree of densification achieved and the results formed the basis of evaluation of load tests and prediction of building foundation performance.
© 1993 Pergamon Press Ltd. Reproduction not permitted
931380 Loss of ground during CFA pile installation in inner urban areas. Technical note Leznicki, J K; Esrig, M ! J Geotech Engng Div ASCE 11118, N6, June 1992, P947-~50
A new method for analysis of flexible beam-columns on elastic foundations is presented. In it, the solution to the problem is divided into a particular solution and four homogeneous solutions. These solutions are evaluated numerically for specified initial boundary conditions. The complete solution is obtained by summing the particular and homogeneous solutions under the constraint that boundary conditions at each end of the beam-column are satisfied. Analysis of a stepped beam-column is illustrated. Buckling of a tapered beam-column is also examined.
Low-vibration, low-noise continuous flight auger plies are often used in settlement-sensitive urban locations. Observations of ground loss during the installation of 27m long, 400mm diameter CFA piles in saturated loose to medium dense, coarse to fine saturated sands are presented. The potential for ground loss exists throughout the installation procedure, but can be minimised by close control of operations and examination of site specific problems at the initial stages. Front-of-wall, spoilless, and mine-piles are suggested for use in addition to CFA piles in urban locations.
931377 Bearing capacity tests on geogrid-reinforced clay Mandal, J N; Sah, H S Geotext Geomem Vll, N3, 1992, P327-333 Tests on square model footings on geogrid-reinforced clay subgrades are described. Load-settlement curves are presented for footings on unreinforced clay and clay with a geogrid layer at a range of depths. Effects of relative depth of the reinforcement (depth/footing size) on bearing capacity ratio (reinforced/unreinforced) and relative reduction in settlement (reinforced/unreinforced) are illustrated. Optimum reinforcement geometry is discussed.
931378 Analysis of laterally loaded shafts in rock Carter, J P; Kulhawy, F H J Geotech Engng Div A S C E Vl18, N6, June 1992, P839-855 The behaviour of flexible and rigid piles socketed into rock and subjected to lateral loading and moments is studied. The finite element method is used to generate parametric solutions for the load-displacement relations, which form the basis for development of simple, approximate, closed-form equations for the practical range of loading conditions and materials properties. Results are in good agreement with available solutions for the limiting cases. An overlying soil layer can be included in the analysis. A method is proposed for prediction of lateral load capacity and applied to back analysis of field tests.
931379 Elastic solutions for arbitrarily shaped foundations. Technical note Li, K S J Geotech Engng Div A S C E Vl18, N6, June 1992, P938-942 Elastic solutions for stresses and deformations caused by foundation loads are available in the form of design charts and tables. These generally consider only regular foundation shapes and cover only a limited range of loading conditions. Manipulations of the standard solutions are often necessary to obtain stresses and deformations at points of interest. To overcome these drawbacks, a method is presented which can calculate the elastic response for arbitrarily shaped foundations with arbitrary stress distributions, using the commercially available computer package MathCAD.
931381 Bearing capacity of improved ground by sand compaction piles Terashi, M; Kitazume, M; Minagawa, S In: Deep Foundation Improvements: Design, Construction, and Testing (Papers to a Symposium presented at Las Vegas, 25 January 1990) P47-61. Publ Philadelphia: ASTM, 1991 ( A S T M Special Technical Publication NI089) The sand compaction pile method is widely used to improve soft clayey coastal deposits in Japan. Because of impracticability of full scale testing, centrifuge model tests were carried out to examine the bearing capacity of improved ground under horizontal and vertical loading. The simple stability analysis commonly used in Japan is able to predict bearing capacity to adequate accuracy. The effectiveness of a simple construction control diagram is demonstrated by observations of ground deformation following its use. The limited full scale data available confirm these results. 931382 Load tests on stone columns Greenwood, D A
In: Deep Foundation Improvements: Design, Construction, and Testing (Papers to a Symposium presented at Las Vegas, 25 January 1990) P148-171. Publ Philadelphia." ASTM, 1991 ( A S T M Special Technical Publication N1089) Stone column foundations are often (incorrectly) regarded as piles and thus tested by direct loading at the ground surface. For single columns, load tests are appropriate, but full scale tests with measurement of soil stresses between columns demonstrate single column results cannot be extrapolated. Stress constraints and load shedding along stone columns are examined. For widespread loads, it is proposed that monitoring of construction techniques and settlement during initial loading form the basis of design. Erratic behaviour can be identified and remedial measures undertaken. 931383 Design and installation of stone columns at Naval Air Station Hayden, R F; Welch, C M
In: Deep Foundation Improvements: Design, Construction, and Testing (Papers to a Symposium presented at Las Vegas, 25 January 1990) P172-184. Publ Philadelphia: ASTM, 1991 ( A S T M Special Technical Publication N1089) Stone columns were installed at the site of a housing project in Nevada, in predominantly sandy soil, to increase bearing capacity, reduce settlement, and mitigate liquefaction potential. Load settlement characteristics were measured in loading tests. CPT and dilatometer tests were used to assess the degree of densification achieved and the results formed the basis of evaluation of load tests and prediction of building foundation performance.
© 1993 Pergamon Press Ltd. Reproduction not permitted