Journal ArticleDOI
Driven piles in clay - the effects of installation and subsequent consolidation
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TLDR
In this article, the effects of installing a driven pile on the strength of the soil were investigated using a work-hardening elasto-plastic soil model, which has the unique feature of allowing the strength to change as the water content changes, thus it is possible to calculate the new intrinsic soil strength at any stage during consolidation.Abstract:
This paper describes the results of numerical analysis of the effects of installing a driven pile. The geometry of the problem has been simplified by the assumption of plane strain conditions in addition to axial symmetry. Pile installation has been modelled as the undrained expansion of a cylindrical cavity. The excess pore pressures generated in this process have subsequently been assumed to dissipate by means of outward radial flow of pore water. The consolidation of the soil has been studied using a work-hardening elasto–plastic soil model which has the unique feature of allowing the strength of the soil to change as the water content changes. Thus it is possible to calculate the new intrinsic soil strength at any stage during consolidation. In particular the long-term shaft capacity of a driven pile may be estimated from the final effective stress state and intrinsic strength of the soil adjacent to the pile. A parametric study has been made of the effect of the past consolidation history of the soil...read more
Citations
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Journal ArticleDOI
Closure of "Expansion of a Cavity in a Saturated Clay Medium"
TL;DR: In this paper, a method of calculation is presented which makes it possible to determine the stress, strain, and pore pressure distribution resulting from the expansion of a spherical or a cylindrical cavity in an infinite medium.
Journal ArticleDOI
Influence of Partial Consolidation during Cone Penetration on Estimated Soil Behavior Type and Pore Pressure Dissipation Measurements
Jason T. DeJong,Mark Randolph +1 more
TL;DR: In this article, the effect of partial consolidation during cone penetration is investigated using results from cavity expansion and finite element analyses as well as field and centrifuge piezocone data.
Journal ArticleDOI
Numerical simulations of stone column installation
Jorge Castro,Minna Karstunen +1 more
TL;DR: In this paper, the authors describe the results of numerical simulations investigating the installation effects of stone columns in a natural soft clay, and the geometry of the problem is simplified to axial symmetry.
Journal ArticleDOI
External radial stress changes and axial capacity for suction caissons in soft clay
W Chen,Mark Randolph +1 more
Abstract: A series of centrifuge tests was performed on instrumented model caissons in normally consolidated, lightly overconsolidated and sensitive clays, to investigate the external radial stress changes around suction caissons during installation, consolidation and pullout, and axial capacity after consolidation. Total pressure transducers embedded at different elevations of the caisson wall showed external radial total stresses that varied almost linearly with depth during both penetration and extraction of the caisson, with smaller gradients during post-consolidation pullout. Only slight differences were found in the measured external radial total stress when pressure transducers entered the suction-affected zone from the jacking-affected zone. Comparisons are presented between measurements and two theoretical predictions, for both the external radial total stress during caisson installation, and the radial effective stress after consolidation. A simple cavity expansion approach was found to give reasonable pr...
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Spherical Cavity Expansion in a Drucker-Prager Solid
David Durban,Norman A. Fleck +1 more
TL;DR: In this article, a finite strain analysis is presented for the pressurized spherical cavity embedded in a Drucker-Prager medium, where material behavior is modeled by a nonassociated deformation theory which accounts for arbitrary strain-hardening.
References
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On the generalized stress-strain behavior of wet clay
TL;DR: The theory of the three-dimensional stress-strain behavior of WET CLAYs was introduced by BURLAND as discussed by the authors, who showed that WETCLAYs are subject to three dimensions of stress and strain.
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Skin Friction between Various Soils and Construction Materials
TL;DR: In this article, the authors used several hundred experiments to determine the magnitude of skin friction, in which the following variables were considered: (1) Various construction materials: steel, wood, concrete; (2) For each material two surface conditions were used: smooth and rough; which are described in such a way that they may be reproduced by anyone with a reasonable degree of accuracy.
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The Sensitivity of Clays
A. W. Skemption,R. D. Northey +1 more
TL;DR: The sensitivity of clays is defined as the ratio of their undisturbed and remoulded strengths, and varies from about 1·O for heavily overconsolidated clays to values of over 100 for the so-called extrasensitive or quick clays.
Journal Article
Bearing capacity and settlement of pile foundations
TL;DR: In this paper, the authors point out further aspects of limit point bearing capacity of piles in sand as well as the overlayered stratum and critical depth, and propose a relationship between the critical depth D sub c and p sub c, or 1 sub 1.