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Constitutive laws of bimodular cross-anisotropic materials
199A
See also: 865187
865231 Shaft capacity of driven pipe piles in clay Semple, R M; Rigden. W J Ground Engng VI9, NI, Jan 1986. PI I-19
865227 Controlling expansive soil destructiveness by deep vertical geomembranes on four highways Steinberg, M L Trans Res Rec N1032. 1985, P48-53
Offshore construction demands continue to focus attention on improving axial capacity prediction for driving pipe piles. The American Petroleum Institute (API) sponsored a two year project to establish a data bank of static pile load test records. New criteria for skin friction in clay, interpreted from this data base, are presented. 56 refs.
To minimise damage caused by swelling subgrades to highways in Texas, USA,relatively impervious barriers were placed vertically along the pavement edges, through the zone of moisture activity to a depth of 8ft. By minimising the change in moisture content in the soils beneath the pavement, destructive movement was reduced.
865232 Singapore monitors hydraulic piling hammers Virgo, J Ground Engng vIg. NI, Jan 1986, P29
Base courses and pavements
865228 Constitutive laws of bimodular cross-anisotropic materials EI-Laithy, A M Proc 5th Engineering Mechanics Dit,ision Speciality Conference, Wyoming, 1-3 Aug 1984 VI, P515-518. Publ New York: ASCE, 1984 Many natural and artificial materials show different strengths in tension and compression (bimodularity). Various mathematical models have been derived to describe such materials. Cross anisotropic materials possess a vertical axis of symmetry and horizontal planes of isotropy. An axisymmetric finite clement computer program has been written to accommodate bimodularity and cross anisotropy, and is used to predict the surface deflections and stress distributions on loading for a three layer (asphalt concrete-gravcl-subgradc) pavement.
Singapore's Housing and Development Board has monitored the criteria of several different models of hydraulic hammer, all of similar energy output per blow, in driving load-bearing piles, generally H piles and precast concrete types. Results of the programme are briefly noted.
865233 Microcomputer analysis of pile groups under general loading Selby, A R; Wallace, P D Ground Engng VI9. NI, Jan 1986, P33-38 A simple two dimensional analysis for predicting pile head forces and moments in groups of vertical and raking piles subject to general working loads is presented in the form of a program in BASIC which can be run, interactively, on a small desk top computer. The method is an analysis of pile cap and of piles represented by equivalent cantilevers, the 'equivalent bent" approach.
865234 Shaft behaviour of a model pile in plastic Empire clays Azzouz, A S; Lutz, D G J Geotech Engng Div ASCE VII2, N4, April 1986, P389-406
Foundations See also: 865188 865229 Contribution to the structural design of shallow foundations on the basis of the static penetrometer test (In French) Amar, S; Morbois, A Bull Liaison Lab Ponts Chaussees NI41, Jan-Feb 1986, P3743 The static penetrometer test is being increasingly used for site investigation on the grounds of speed and economy of use. It is necessary to develop rules for the structural design of shallow foundations on the basis of this test, similar to those which exist for piles. The procedures adopted to this end are described, and a number of charts are proposed which give the coefficient of bearing capacity as a function of soil type and relative embcdment depth. Various published methods of calculating settlement are commented on.
865230 Construction on unstable land Civ Engng, London March 1986. P21-29 Modern piling and ground treatment can make most land, even reclaimed land with demolition fill or sites peppered with previously used piles, suitable for development. The piling options, driven piles, small or large diameter bored piles, and minipiles, and suitable ground treatments such as vibroflotation, dynamic compaction or grouting are briefly reviewed.
Results are presented of an experimental program involving extensive laboratory and field tests to determine the in situ soil conditions and properties existing at the Empire site prior to pile installation, and a study of important factors affecting pile shafts in Empire clays, by means of in situ measurements of stresses and pore pressures acting on a model pile shaft during the various stages of the life of a pile. Predictions of the site pile capacities, based on model pile test measurements and results of theoretical investigations, are presented and compared.
865235 Role of load tests in friction pile design Azzouz, A S J Geotech Engng Div ASCE VII2, N4, April 1986, P407-423 In situ measurements of stresses and pore pressures on a model pile shaft,using the Piezo-Lateral Stress (PLS) cell, are combined with theoretical analyses to reconstruct the conditions of a large-scale pile load test at a site in Empire, USA. Results show that the mode of penetration of open-ended piles has an important effect on the performance of pile shafts. Pile plugging during driving retards the rates of soil consolidation and the gain in shaft capacity after installation. The Empire experience is used to identify important factors affecting shaftsoil interaction which require control and/or evaluation during pile load tests. Methods of enhancing the value of pile load test data in the future are recommended. Auth.
© 1986 Pergamon Journals Ltd. Reproduction not permitted
See also: 865187
865231 Shaft capacity of driven pipe piles in clay Semple, R M; Rigden. W J Ground Engng VI9, NI, Jan 1986. PI I-19
865227 Controlling expansive soil destructiveness by deep vertical geomembranes on four highways Steinberg, M L Trans Res Rec N1032. 1985, P48-53
Offshore construction demands continue to focus attention on improving axial capacity prediction for driving pipe piles. The American Petroleum Institute (API) sponsored a two year project to establish a data bank of static pile load test records. New criteria for skin friction in clay, interpreted from this data base, are presented. 56 refs.
To minimise damage caused by swelling subgrades to highways in Texas, USA,relatively impervious barriers were placed vertically along the pavement edges, through the zone of moisture activity to a depth of 8ft. By minimising the change in moisture content in the soils beneath the pavement, destructive movement was reduced.
865232 Singapore monitors hydraulic piling hammers Virgo, J Ground Engng vIg. NI, Jan 1986, P29
Base courses and pavements
865228 Constitutive laws of bimodular cross-anisotropic materials EI-Laithy, A M Proc 5th Engineering Mechanics Dit,ision Speciality Conference, Wyoming, 1-3 Aug 1984 VI, P515-518. Publ New York: ASCE, 1984 Many natural and artificial materials show different strengths in tension and compression (bimodularity). Various mathematical models have been derived to describe such materials. Cross anisotropic materials possess a vertical axis of symmetry and horizontal planes of isotropy. An axisymmetric finite clement computer program has been written to accommodate bimodularity and cross anisotropy, and is used to predict the surface deflections and stress distributions on loading for a three layer (asphalt concrete-gravcl-subgradc) pavement.
Singapore's Housing and Development Board has monitored the criteria of several different models of hydraulic hammer, all of similar energy output per blow, in driving load-bearing piles, generally H piles and precast concrete types. Results of the programme are briefly noted.
865233 Microcomputer analysis of pile groups under general loading Selby, A R; Wallace, P D Ground Engng VI9. NI, Jan 1986, P33-38 A simple two dimensional analysis for predicting pile head forces and moments in groups of vertical and raking piles subject to general working loads is presented in the form of a program in BASIC which can be run, interactively, on a small desk top computer. The method is an analysis of pile cap and of piles represented by equivalent cantilevers, the 'equivalent bent" approach.
865234 Shaft behaviour of a model pile in plastic Empire clays Azzouz, A S; Lutz, D G J Geotech Engng Div ASCE VII2, N4, April 1986, P389-406
Foundations See also: 865188 865229 Contribution to the structural design of shallow foundations on the basis of the static penetrometer test (In French) Amar, S; Morbois, A Bull Liaison Lab Ponts Chaussees NI41, Jan-Feb 1986, P3743 The static penetrometer test is being increasingly used for site investigation on the grounds of speed and economy of use. It is necessary to develop rules for the structural design of shallow foundations on the basis of this test, similar to those which exist for piles. The procedures adopted to this end are described, and a number of charts are proposed which give the coefficient of bearing capacity as a function of soil type and relative embcdment depth. Various published methods of calculating settlement are commented on.
865230 Construction on unstable land Civ Engng, London March 1986. P21-29 Modern piling and ground treatment can make most land, even reclaimed land with demolition fill or sites peppered with previously used piles, suitable for development. The piling options, driven piles, small or large diameter bored piles, and minipiles, and suitable ground treatments such as vibroflotation, dynamic compaction or grouting are briefly reviewed.
Results are presented of an experimental program involving extensive laboratory and field tests to determine the in situ soil conditions and properties existing at the Empire site prior to pile installation, and a study of important factors affecting pile shafts in Empire clays, by means of in situ measurements of stresses and pore pressures acting on a model pile shaft during the various stages of the life of a pile. Predictions of the site pile capacities, based on model pile test measurements and results of theoretical investigations, are presented and compared.
865235 Role of load tests in friction pile design Azzouz, A S J Geotech Engng Div ASCE VII2, N4, April 1986, P407-423 In situ measurements of stresses and pore pressures on a model pile shaft,using the Piezo-Lateral Stress (PLS) cell, are combined with theoretical analyses to reconstruct the conditions of a large-scale pile load test at a site in Empire, USA. Results show that the mode of penetration of open-ended piles has an important effect on the performance of pile shafts. Pile plugging during driving retards the rates of soil consolidation and the gain in shaft capacity after installation. The Empire experience is used to identify important factors affecting shaftsoil interaction which require control and/or evaluation during pile load tests. Methods of enhancing the value of pile load test data in the future are recommended. Auth.
© 1986 Pergamon Journals Ltd. Reproduction not permitted