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Stresses and displacements in an anisotropic soil produced by a ring foundation
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873229 Assessment of the effects of structure/raft/soil interaction Yao, Z E; Zhang, J R Proc 5th International Conference on Numerical Methods in Geomechanics, Nagoya, 1-5 April 1985 V2, P813-819. Publ Rotterdam: ,4. A. Balkema, 1985
beating capacity were investigated. The highly compressible nature of calcareous sands results in much lower bearing capacities than silica sand. Measured and calculated bearing capacities are compared. The best fit is obtained for calcareous sands if Vesic's cavity expansion theory is applied.
A simplified effective stress finite element analysis is presented to study the soil structure interaction of rafted framed structures on inhomogeneous soils. The effects of variations in relative section rigidity of the frame, raft thickness or elastic modulus of the soil on bending moment in the raft or frame and differential settlement of the foundation are examined.
873234 Finite element analysis of mechanisms of pile group behaviour Pressley, J S; Poulos, H G University of Sydney School of Civil and Mining Engineering research report R518, March 1986, 20P
873230 Stresses and displacements in an anisotropic soil produced by a ring foundation Milovic, D M; Todorovic, T Proc 5th International Conference on Numerical Methods in Geomechanics, Nagoya, 1-5 April 1985 V2, P821-827. Publ Rotterdam: ,4. A. Balkema, 1985
Nonlinear settlement behaviour of square-configuration pile groups is analysed using the PILFDS program, which models elastic piles in an elastic-plastic soil which can follow a nonassociated flow rule. At close spacing the block failure mechanism occurs with significant plastic zones developed between the group, and full pile-soil slip (single pile behaviour) only along the outer piles. As spacing increases, the failure mechanism gradually changes to the single pile mode. Group settlement ratio and efficiency are in reasonable agreement with other theoretical estimates.
Using finite element anlaysis, stresses and displacements produced by a flexible ring foundation resting on compressible layers of a finite thickness have been calculated. Results are presented for several values of the ratio between ring outside diameter and compressible layer thickness. 873231 Bearing capacity of a circular footing on a Coulomb medium de Simone, P Proc 5th International Conference on Numerical Methods in Geomechanics, Nagoya, 1-5 April 1985 V2, P829-836. Publ Rotterdam: ,4. `4. Balkema, 1985 The bearing capacity of both smooth and rough footings is determined under the conditions of axial symmetry and under the Haar-Von Karman hypothesis. The numerical problems involved in the finite difference solution are discussed. The results are compared with those available in the literature for a smooth footing, and with those obtained by means of the assumption of the principle of superposition. Auth. 873232 Torsion of flexible piles embedded in elastic soil media Rajapakse, R K N D; Selvadurai, A P S Proc 5th International Conference on Numerical Methods in Geomechanics, Nagoya, 1-5 April 1985 V2, P845-852. Publ Rotterdam: A. A. Balkema, 1985 The idealised problem of the torsion of an elastic pile partially embedded in a layered elastic half space is examined. The analysis uses a novel solution procedure which is essentially numerical in character but utilises the advantages of a variational concept. Numerical results illustrate the influence of the relative flexibility of the pile-half space system on the torsional response.
873235 Effect of loading rate on pile skin friction in sands Mao Yuan; Poulos, H G University of Sydney School of Civil and Mining Engineering research report R519, March 1986, 19P Ultimate skin friction is generally reduced following cyclic loading, but there may be a counteracting effect at high strain rate, as strength of soils tends to increase with loading rate. Simple pullout tests on model piles were carried out to investigate the effect of loading rate on skin friction in silica and carbonate sands. Ultimate skin friction increased with increasing loading rate for the calcareous soil, but there was no effect in silica sand.
873236 Axial static capacity of steel model piles in overconsolidated clay Karlsrud, K; Haugen, T Norw Geotech Inst Pubi N163, 1986, 7P An instrumented steel pile was repeatedly installed in overconsolidated clays and load tested, mostly in tension. Effective stresses measured against the pile surface after installation and reconsolidation were smaller than those predicted by available theoretical models. The measured limit skin friction agreed closely with the strength properties of remoulded, reconsolidated clay, consolidated to the pile surface effective stress. It differed significantly with that calculated using intact clay properties. The properties of clays found next to the pile wall also agreed closely with those of laboratory remoulded reconsolidated clays.
873233 Bearing capacity of foundations on calcareous sand Poulos, H G; Chua, E W
873237 Soil structure interaction study for a piled concrete platform Clausen, C J F, Kjekstad, O; Hansteen, O E
University of Sydney School of Civil and Mining Engineering research report R515, Jan 1986, 22P
Norw Geotech Inst Publ N]63, ]986, 6P
Carefully controlled laboratory model footing tests were carried out on calcareous and silica sands. The influences of overburden pressure, relative density, and cyclic loading on
Static and dynamic analyses are presented of the soil structure interaction of the CONDEEP T300 offshore platform, which is to be installed on soft soils in deep water in the Troll Field, North Sea.
© 1987 Pergamon Journals Ltd. Reproduction not permitted
873229 Assessment of the effects of structure/raft/soil interaction Yao, Z E; Zhang, J R Proc 5th International Conference on Numerical Methods in Geomechanics, Nagoya, 1-5 April 1985 V2, P813-819. Publ Rotterdam: ,4. A. Balkema, 1985
beating capacity were investigated. The highly compressible nature of calcareous sands results in much lower bearing capacities than silica sand. Measured and calculated bearing capacities are compared. The best fit is obtained for calcareous sands if Vesic's cavity expansion theory is applied.
A simplified effective stress finite element analysis is presented to study the soil structure interaction of rafted framed structures on inhomogeneous soils. The effects of variations in relative section rigidity of the frame, raft thickness or elastic modulus of the soil on bending moment in the raft or frame and differential settlement of the foundation are examined.
873234 Finite element analysis of mechanisms of pile group behaviour Pressley, J S; Poulos, H G University of Sydney School of Civil and Mining Engineering research report R518, March 1986, 20P
873230 Stresses and displacements in an anisotropic soil produced by a ring foundation Milovic, D M; Todorovic, T Proc 5th International Conference on Numerical Methods in Geomechanics, Nagoya, 1-5 April 1985 V2, P821-827. Publ Rotterdam: ,4. A. Balkema, 1985
Nonlinear settlement behaviour of square-configuration pile groups is analysed using the PILFDS program, which models elastic piles in an elastic-plastic soil which can follow a nonassociated flow rule. At close spacing the block failure mechanism occurs with significant plastic zones developed between the group, and full pile-soil slip (single pile behaviour) only along the outer piles. As spacing increases, the failure mechanism gradually changes to the single pile mode. Group settlement ratio and efficiency are in reasonable agreement with other theoretical estimates.
Using finite element anlaysis, stresses and displacements produced by a flexible ring foundation resting on compressible layers of a finite thickness have been calculated. Results are presented for several values of the ratio between ring outside diameter and compressible layer thickness. 873231 Bearing capacity of a circular footing on a Coulomb medium de Simone, P Proc 5th International Conference on Numerical Methods in Geomechanics, Nagoya, 1-5 April 1985 V2, P829-836. Publ Rotterdam: ,4. `4. Balkema, 1985 The bearing capacity of both smooth and rough footings is determined under the conditions of axial symmetry and under the Haar-Von Karman hypothesis. The numerical problems involved in the finite difference solution are discussed. The results are compared with those available in the literature for a smooth footing, and with those obtained by means of the assumption of the principle of superposition. Auth. 873232 Torsion of flexible piles embedded in elastic soil media Rajapakse, R K N D; Selvadurai, A P S Proc 5th International Conference on Numerical Methods in Geomechanics, Nagoya, 1-5 April 1985 V2, P845-852. Publ Rotterdam: A. A. Balkema, 1985 The idealised problem of the torsion of an elastic pile partially embedded in a layered elastic half space is examined. The analysis uses a novel solution procedure which is essentially numerical in character but utilises the advantages of a variational concept. Numerical results illustrate the influence of the relative flexibility of the pile-half space system on the torsional response.
873235 Effect of loading rate on pile skin friction in sands Mao Yuan; Poulos, H G University of Sydney School of Civil and Mining Engineering research report R519, March 1986, 19P Ultimate skin friction is generally reduced following cyclic loading, but there may be a counteracting effect at high strain rate, as strength of soils tends to increase with loading rate. Simple pullout tests on model piles were carried out to investigate the effect of loading rate on skin friction in silica and carbonate sands. Ultimate skin friction increased with increasing loading rate for the calcareous soil, but there was no effect in silica sand.
873236 Axial static capacity of steel model piles in overconsolidated clay Karlsrud, K; Haugen, T Norw Geotech Inst Pubi N163, 1986, 7P An instrumented steel pile was repeatedly installed in overconsolidated clays and load tested, mostly in tension. Effective stresses measured against the pile surface after installation and reconsolidation were smaller than those predicted by available theoretical models. The measured limit skin friction agreed closely with the strength properties of remoulded, reconsolidated clay, consolidated to the pile surface effective stress. It differed significantly with that calculated using intact clay properties. The properties of clays found next to the pile wall also agreed closely with those of laboratory remoulded reconsolidated clays.
873233 Bearing capacity of foundations on calcareous sand Poulos, H G; Chua, E W
873237 Soil structure interaction study for a piled concrete platform Clausen, C J F, Kjekstad, O; Hansteen, O E
University of Sydney School of Civil and Mining Engineering research report R515, Jan 1986, 22P
Norw Geotech Inst Publ N]63, ]986, 6P
Carefully controlled laboratory model footing tests were carried out on calcareous and silica sands. The influences of overburden pressure, relative density, and cyclic loading on
Static and dynamic analyses are presented of the soil structure interaction of the CONDEEP T300 offshore platform, which is to be installed on soft soils in deep water in the Troll Field, North Sea.
© 1987 Pergamon Journals Ltd. Reproduction not permitted