Effective Stress Analysis and Set-up for Shaft Capacity of Piles in Clay

  title={Effective Stress Analysis and Set-up for Shaft Capacity of Piles in Clay},
  author={Bengt H. Fellenius},
A case history of repeated dynamic and static loading tests in Alberta on two pipe piles during dissipation of driving-induced pore pressures is presented together with three reanalyzed published case histories involving similar records. The four case histories demonstrate that, for each case, the same effective-stress proportionality coefficients, beta-coefficients, fit the capacities at different degrees of dissipation of excess pore pressures. For two of the test sites, the beta-coefficients… Expand
Discussion of “Pile Aging in Cohesive Soils” by Paul Doherty and Kenneth Gavin
Most published case histories on the growth of pile capacity with time are limited to a rather short period of observations, usually no more than a few weeks. This makes the authors’ 10-year periodExpand
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The computer program pile negative skin friction (PileNSF) was developed by the authors to predict the bearing capacity of a pile embedded in a consolidating ground due to surcharge loading. TheExpand
Negative skin friction on piles based on finite strain consolidation theory and the nonlinear load transfer method
The development of dragload and downdrag on single piles in consolidating ground is investigated in this study with a simplified one-dimensional soil-pile model that combines the nonlinear loadExpand
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The behavior of single piles subjected to negative skin friction in soft soil was conducted by analyzing the results from full-scale long-term field measurements and three-dimensional (3D) numericalExpand
A Program Development for Prediction of Negative Skin Friction on Piles by Consolidation Settlement
The microcomputer program PileNSF (Pile Negative Skin Friction) is developed by the authors in a graphical user Ⓡ for predicting the bearing capacity of a pile embedded in a consolidating ground byExpand
Experimental Study to Evaluate the Effect of Consolidation Behavior on Pile Setup
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Analytical Models to Estimate the Time Dependent Increase in Pile Capacity (Pile Set-Up)
This paper presents the analyses of twelve prestressed concrete (PSC) instrumented test piles that were driven in different locations of Louisiana in order to develop analytical models to estimateExpand
Design for a large refinery expansion was undertaken at a site reclaimed from a lake about 40 years ago. The natural soils consist of sand deposited on normally consolidated, compressible postExpand
Development of negative skin friction on single piles: uncoupled analysis based on nonlinear consolidation theory with finite strain and the load-transfer method
The development of negative skin friction (NSF) on single piles is investigated based on an uncoupled method of analysis with the Mikasa (1963) generalized nonlinear consolidation theory in terms ofExpand
Pile Setup over a Period of Seven Years Based on Dynamic Load Tests in Overconsolidated Clay
This paper presents the results of a field investigation into pile setup in overconsolidated clay soil that was conducted during a period of almost seven years, at Guabirotuba Geological Formation,Expand


Behaviour of a sensitive clay during pile driving
A full scale investigation with six instrumented test piles has been carried out on the Saint-Alban test site in order to study the behaviour of friction piles in soft sensitive soils. The first partExpand
Bearing capacity of friction piles in marine clay
A full-scale investigation with two instrumented test piles was carried out at the St Alban test site, to study the increase in bearing capacity with time of short friction piles jacked into anExpand
Pile capacity by direct CPT and CPTu methods applied to 102 case histories
Six methods to determine axial pile capacity directly from cone penetration test (CPT) data are presented, discussed, and compared. Five of the methods are CPT methods that apply total stress and aExpand
Side Shear Setup. I: Test Piles Driven in Florida
The available literature indicates that pile side shear increases almost linearly with the logarithm of time elapsed after driving, sometimes described using a dimensionless setup factor. A test pileExpand
Development of negative skin friction on driven piles in soft Bangkok clay
This paper describes the results of short-term pullout tests and long-term full-scale measurements of negative skin friction on driven piles in Bangkok subsoils. Two instrumented cylindrical (hollow)Expand
Results from long-term measurement in piles of drag load and downdrag
Several full-scale, long-term tests on instrumented piles performed since the 1960s and through the 1990s are presented. The results of the tests show that a large drag load will develop in pilesExpand
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Tests on piles—driven or bored—sometimes include instrumentation for determining the load distribution. The instrumentation can range from a telltale or two through a sophisticated array of strainExpand
Predicting axially and laterally loaded pile behaviour using in-situ testing methods
The prediction of axial and lateral pile behaviour is a complex engineering problem. Traditional methods of data collection and subsequent analyses are frequently in error when compared toExpand
Soil disturbance from pile driving in sensitive clay
Soil disturbance due to the driving of two groups of 116 concrete piles each in sensitive marine clay was studied on a construction project in eastern Canada. Pore-water pressures, heave, and lateralExpand
Downdrag Measurements on a 160-Ft Floating Pipe Test Pile in Marine Clay
Large negative skin friction loads were observed on a 160 ft (49 m) steel pipe test pile floating in marine clay. The test pile was driven, open-ended, on the centerline of a 30 ft (9 m) highExpand