Journal ArticleDOI
Driven piles in clay - the effects of installation and subsequent consolidation
Reads0
Chats0
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
More filters
Journal ArticleDOI
Behaviour of expanded piles under upward loading due to radial preloading in soft clay
TL;DR: In this article, a two-dimensional numerical analysis was employed to evaluate the radial preloading effects on the bored piles bearing capacity under upward loading, and the results revealed that the bearing capacity is increased due to impose of radial loading for bored piles, meaningfully.
Journal ArticleDOI
Elastoplastic solutions for cylindrical cavity expansion in unsaturated soils
TL;DR: In this article, an elastoplastic critical state model for unsaturated soils is used to derive the constitutive matrix for both the undrained and drained expansion of a cylindrical cavity in unsaturated soil, which are finally formulated to a system of first-order differential equations.
Journal ArticleDOI
Expansion of spherical cavity of strain-softening materials with different elastic moduli of tension and compression
TL;DR: An expansion theory of spherical cavities in strain-softening materials with different moduli of tension and compression was presented in this paper, where the effects caused by different elastic moduli in tensile and compression and strainsoftening rates on stress and displacement fields and development of plastic zone of expansion of cavity were analyzed.
Journal ArticleDOI
Effect of the Smear Zone around SCP Improved Composite Samples Tested in the Laboratory
TL;DR: In this paper, the effect of the smear zone around sand compaction piles is modeled using triaxial tests, and the results show that extensive remolding of the preferred soil fabric can occur within the zone immediately surrounding the SCP during its installation.
Prediction of Pile Set-Up for Ohio Soils
Lutful I. Khan,Kirk Decapite +1 more
TL;DR: In this paper, the set-up phenomenon of small diameter driven pipe piles for bridge foundations was investigated in Ohio geology and an equation was proposed between the final and initial load capacities of the piles as a function of time and shown to be in good agreement with the strength gains of driven pipe pile in Ohio soils.
References
More filters
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.