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Possibility of reducing the duration of static pile tests
89A the reworked soils at controlled moisture content and density. The upper portion of the replaced soil may be lime stabilised to preserve high moisture content.
882297
882293 Base course contamination limits Jorenby, B N; Hicks, R G Trans Res Rec NI095, 1986, P86-101
Using the numerical technique for solving nonlinear simultaneous equations, the new method of analysis is developed for the design of eccentric and/or inclined loaded rigid piles in clay. The method takes account of the nonlinear stress-strain characteristics of the soil around the piles and can be used for round, rectangular and other symmetric rigid piles. The computed results using this method were found to be in good agreement with the measured values of some field tests and laboratory model tests. Auth.
The use of geotextiles in pavement construction to prevent contamination of aggregate base by subgrade fines, with consequent change in gradation, strength, and permeability, is studied. Geotextiles modify the process of intrusion, the level of stress at the interface, and the process of filtration. Laboratory tests have been carried out to evaluate the influence of fines on the stiffness of an aggregate base. Results are discussed with reference to strength and drainage requirements of forest roads.
Foundations See also: 882141, 882190, 882192
882294 Centrifuge static and dynamic lateral pile behaviour Ting, J M; Kauffman, C R; Lovicsek, M Can Geotech J V24, N2, May 1987, Pl98-207 Centrifuge model tests simulated the cyclic static and dynamic loading of a single vertical pile embedded in saturated sand. Dynamic and static p-y curves were obtained and compared with those from full scale dynamic tests and oil industry design guidelines. The centrifuge technique appears to model dynamic behaviour properly. At Ioadings causing significant nonlinearity, static stiffness exceeds dynamic, and material hysteresis is about the same in each case. API curves for static cyclic loading appear to overestimate the dynamic lateral resistance for medium dense sands.
New method for non-linear analysis of rigid piles in clay Qi-feng Liu; Meyerhof, G G Comput Geotech V4, N4, 1987. P185-212
882298 Infinite layer for the analysis of a single pile Guo, D J; Tham, L G; Cheung, Y K Comput Geotech V4, N4, 1987, P229-249 A solution for a single pile embedded in a layered soil is proposed which uses an infinite layer model with a cylindrical coordinate system for the solution of static problems in an elastic half space. The elements are coupled to special pile elements and can accurately model pile behaviour. Typical examples of a single pile are presented to demonstrate the accuracy and versatility of this approach. 882299
Monitoring of pile construction in the Arabian Gulf Peronius, A N; Kristensen, P S Ground Engng 1120, N5, July 1987, P23-26 The Saudi Arabia-Bahrain Causeway required the installation of 498 large diameter precast piles, to depths 10-22m in sands and weak mudstones. Preconstruction site investigation is described. A simple drill index, vertical pressure divided by penetration rate, was used to monitor the placement of the piles. This technique proved a useful method to confirm that piles were placed in strata as anticipated in the design.
882295
Experimental study of the bearing capacity of a layer of granular soil of finite thickness (In French) Siraj-EIdine, K; Bottero, A Can Geotech J 1/24, N2, May 1987, P242-251 Tests were carried out on circular and rectangular model surface foundations resting on a sand layer. Foundation-soil behaviour is displayed graphically and relations between bearing capacity coefficient and compressible layer thickness, shape factor of the model, and foundation-sand and sandsubstrate frictional properties examined. Results are compared with others reported, and a testing procedure for determining the ultimate load for shallow foundations proposed.
88230O
Interaction between jack-up rig foundations and offshore platform piles Chow, Y K lnt J Num Anal Meth Geomech VII, N4, July-Aug 1987, P325-344 Jack up rigs are often cantilevered over piled platforms for further drilling in the proximity of the platform, and will affect the performance of the piled foundations. Parametric solutions are provided to evaluate the effects of vertical or horizontal footing loadings on axial or lateral pile response. Homogeneous and inhomogeneous soil conditions are considered. A practical application of the solutions is demonstrated.
882296
Nonlinear analysis of laterally loaded piles in eohesionless
882301
soils Budhu, M; Davies, T G Can Geotech J V24, N2, May 1987, P289-296
Elastic foundation settlements on sand deposits Bowles, J E J Geotech Engng Div ASCE V113, NS, Aug 1987, P846-860
An analysis of laterally loaded piles is presented which is based on an extension of the elastic boundary element analysis and takes account of soil yielding. It is an alternative to the well known p-y method. Input soil parameters are internal friction and one characterising the variation of soil stiffness with depth. Results indicate that soil yielding has a significant influence on pile bending moments and lateral displacements. Equations suitable for routine design are presented. Theoretical results agree well with published case histories.
A method for calculating the elastic settlement of a foundation on a sand layer is proposed, which uses the conventional settlement equation, but where the influence factor which accounts for stratum depth and foundation shape is adjusted to a reduced influence depth, taken to be a maximum of 5X the foundation width but not more than stratum depth. A number of settlement cases examined using this procedure show very good results. It is not necessary to make large adjustments to soil elastic parameters.
© 1988 Pergamon Press plc. Reproduction not permitted
882297
882293 Base course contamination limits Jorenby, B N; Hicks, R G Trans Res Rec NI095, 1986, P86-101
Using the numerical technique for solving nonlinear simultaneous equations, the new method of analysis is developed for the design of eccentric and/or inclined loaded rigid piles in clay. The method takes account of the nonlinear stress-strain characteristics of the soil around the piles and can be used for round, rectangular and other symmetric rigid piles. The computed results using this method were found to be in good agreement with the measured values of some field tests and laboratory model tests. Auth.
The use of geotextiles in pavement construction to prevent contamination of aggregate base by subgrade fines, with consequent change in gradation, strength, and permeability, is studied. Geotextiles modify the process of intrusion, the level of stress at the interface, and the process of filtration. Laboratory tests have been carried out to evaluate the influence of fines on the stiffness of an aggregate base. Results are discussed with reference to strength and drainage requirements of forest roads.
Foundations See also: 882141, 882190, 882192
882294 Centrifuge static and dynamic lateral pile behaviour Ting, J M; Kauffman, C R; Lovicsek, M Can Geotech J V24, N2, May 1987, Pl98-207 Centrifuge model tests simulated the cyclic static and dynamic loading of a single vertical pile embedded in saturated sand. Dynamic and static p-y curves were obtained and compared with those from full scale dynamic tests and oil industry design guidelines. The centrifuge technique appears to model dynamic behaviour properly. At Ioadings causing significant nonlinearity, static stiffness exceeds dynamic, and material hysteresis is about the same in each case. API curves for static cyclic loading appear to overestimate the dynamic lateral resistance for medium dense sands.
New method for non-linear analysis of rigid piles in clay Qi-feng Liu; Meyerhof, G G Comput Geotech V4, N4, 1987. P185-212
882298 Infinite layer for the analysis of a single pile Guo, D J; Tham, L G; Cheung, Y K Comput Geotech V4, N4, 1987, P229-249 A solution for a single pile embedded in a layered soil is proposed which uses an infinite layer model with a cylindrical coordinate system for the solution of static problems in an elastic half space. The elements are coupled to special pile elements and can accurately model pile behaviour. Typical examples of a single pile are presented to demonstrate the accuracy and versatility of this approach. 882299
Monitoring of pile construction in the Arabian Gulf Peronius, A N; Kristensen, P S Ground Engng 1120, N5, July 1987, P23-26 The Saudi Arabia-Bahrain Causeway required the installation of 498 large diameter precast piles, to depths 10-22m in sands and weak mudstones. Preconstruction site investigation is described. A simple drill index, vertical pressure divided by penetration rate, was used to monitor the placement of the piles. This technique proved a useful method to confirm that piles were placed in strata as anticipated in the design.
882295
Experimental study of the bearing capacity of a layer of granular soil of finite thickness (In French) Siraj-EIdine, K; Bottero, A Can Geotech J 1/24, N2, May 1987, P242-251 Tests were carried out on circular and rectangular model surface foundations resting on a sand layer. Foundation-soil behaviour is displayed graphically and relations between bearing capacity coefficient and compressible layer thickness, shape factor of the model, and foundation-sand and sandsubstrate frictional properties examined. Results are compared with others reported, and a testing procedure for determining the ultimate load for shallow foundations proposed.
88230O
Interaction between jack-up rig foundations and offshore platform piles Chow, Y K lnt J Num Anal Meth Geomech VII, N4, July-Aug 1987, P325-344 Jack up rigs are often cantilevered over piled platforms for further drilling in the proximity of the platform, and will affect the performance of the piled foundations. Parametric solutions are provided to evaluate the effects of vertical or horizontal footing loadings on axial or lateral pile response. Homogeneous and inhomogeneous soil conditions are considered. A practical application of the solutions is demonstrated.
882296
Nonlinear analysis of laterally loaded piles in eohesionless
882301
soils Budhu, M; Davies, T G Can Geotech J V24, N2, May 1987, P289-296
Elastic foundation settlements on sand deposits Bowles, J E J Geotech Engng Div ASCE V113, NS, Aug 1987, P846-860
An analysis of laterally loaded piles is presented which is based on an extension of the elastic boundary element analysis and takes account of soil yielding. It is an alternative to the well known p-y method. Input soil parameters are internal friction and one characterising the variation of soil stiffness with depth. Results indicate that soil yielding has a significant influence on pile bending moments and lateral displacements. Equations suitable for routine design are presented. Theoretical results agree well with published case histories.
A method for calculating the elastic settlement of a foundation on a sand layer is proposed, which uses the conventional settlement equation, but where the influence factor which accounts for stratum depth and foundation shape is adjusted to a reduced influence depth, taken to be a maximum of 5X the foundation width but not more than stratum depth. A number of settlement cases examined using this procedure show very good results. It is not necessary to make large adjustments to soil elastic parameters.
© 1988 Pergamon Press plc. Reproduction not permitted