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
Determining Preconsolidation Stress and Penetration Pore Pressures from DMT Contact Pressures
TL;DR: In this paper, the flat dilatometer test (DMT) was used to estimate the in-situ overconsolidation ratio (OCR) with depth, and the pore pressure response of clay is influenced by the OCR.
Journal ArticleDOI
Measuring effects of X-section pile installation in soft clay
TL;DR: In this paper, a modified cavity expansion method suitable for use with an X-shaped cast-in-place concrete pile was developed, and the predicted maximum radial displacement, pore pressures and radial stresses were found to be in reasonable agreement with the field measurements.
Book ChapterDOI
Installation effects of vibro replacement stone columns in soft clay
D. Egan,W. Scott B. McCabe +1 more
TL;DR: In this paper, the authors consider the ground response during the installation of a dry bottom feed stone column, changes to the soil stress field and pore water pressure during the equalization period following stone column construction, and the interaction effects resulting from the construction of both small groups and large grids of columns.
Journal ArticleDOI
A large deformation finite element investigation of pile group installations with consideration of intervening consolidation
TL;DR: In this article, effective stress large deformation analyses of pile group installations with consideration of intervening consolidation are presented. But the role that the intervening consolidation can play in affecting soil stress and strength states as well as set-up of pile capacities remains largely unclear.
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.