Journal ArticleDOI
Driven piles in clay - the effects of installation and subsequent consolidation
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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
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Journal ArticleDOI
Geosynthetic reinforced column supported embankments and the role of ground improvement installation effects
TL;DR: For geosynthetic reinforced column supported embankments (GRCSE) as discussed by the authors, lateral forces associated with lateral sliding and embankment stability often govern the acceptability of GRCSE.
Journal ArticleDOI
Stress transform method to undrained and drained expansion of a cylindrical cavity in anisotropic modified cam-clay soils
TL;DR: In this article, a generic stress transform matrix was developed to incorporate the well-known Spatially Mobilized Plane (SMP) criterion into the widely used framework of cavity expansion theory.
DissertationDOI
An arbitrary Lagrangian-Eulerian method for penetration into sand at finite deformation
TL;DR: In this paper, an operator-split operator is used to break up the solution of the governing equations over a time step into a Lagrangian step, a mesh regularization step, and a transport step.
Journal ArticleDOI
Time-dependent bearing capacity of a jacked pile: An analytical approach based on effective stress method
TL;DR: In this article, the authors performed a theoretical study on the time-dependent bearing capacity of a jacked pile by considering the entire stress history of the surrounding soil, and proposed an analytical approach based on the effective stress method.
Journal ArticleDOI
Analysis of cylindrical cavity expansion in a strain weakening material
John P. Carter,S.K. Yeung +1 more
TL;DR: In this paper, a numerical approach is proposed to predict the behavior of a single phase, strain softening material during the expansion of a long cylindrical cavity, using finite element techniques.
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.
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.