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
Citations
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Journal ArticleDOI
Compressive and flexural behaviour of reinforced concrete permeable piles
TL;DR: In this paper, the authors investigated the influence of concrete strength and pattern of drainage holes in terms of diameter, total number and layers on the ultimate compressive strength of normal and permeable piles.
Book ChapterDOI
Response of Piles in Soft Clay and Silt Deposits to Static and Cyclic Axial Loading Based on Recent Instrumented Pile Load Tests
TL;DR: The Norwegian Geotechnical Institute (NGI) carried out an extensive series of static and cyclic axial load tests on well instrumented piles, respectively in a soft plastic clay deposit at Onsoy (Norway), a silty clay and a mainly clayey silt deposit at Pentre (UK) as discussed by the authors.
Journal ArticleDOI
Radial consolidation with variable compressibility and permeability following pile installation
TL;DR: In this paper, the dissipation of the excess pore pressure generated by pile installation gradually dissipates following installation, which mainly dominates the increase of pile capacity with time, and the influence of variable compressibility and permeability on the variation of the consolidation coefficient and the excesspore pressure dissipation is analyzed.
Journal ArticleDOI
Shaft Resistance of Drilled Shafts in Clay
TL;DR: In this paper, a finite-element analysis was performed to simulate the essential stages of the installation and loading of drilled shafts in clay for different initial stresses, different overconsolidation ratios, and dif- ferent values of the difference between the critical state and the minimum residual friction angles.
Journal ArticleDOI
Cavity expansion in cemented materials: structure degradation effects
F. Schnaid,F. M. Mántaras +1 more
TL;DR: In this article, a numerical solution of a cylindrical cavity expansion problem is presented, which is formulated within the framework of non-associated plasticity, to demonstrate the significance of structure degradation during shear for a bonded cohesive-frictional material.
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.