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
Deep Mixing Induced Property Changes in Surrounding Sensitive Marine Clays
Shui-Long Shen,Shui-Long Shen,Shui-Long Shen,Jie Han,Jie Han,Jie Han,Yan-Jun Du,Yan-Jun Du,Yan-Jun Du +8 more
TL;DR: In this paper, a field study of installation effects of deep mixed columns on properties of the sensitive Ariake marine clay is presented, showing that the water content of the surrounding clay decreased while the concentration of cations increased as sampling locations approached the columns.
Journal ArticleDOI
Side resistance in piles and drilled shafts
TL;DR: In this article, the authors summarized results of important recent research on a few aspects of the topic of side resistance, most notably (1) driven piles in saturated clay, (2) driven pile in siliceous sand loaded in compression and uplift, (3) drilled shafts in clay, and (4) drilled holes in soft rock.
Journal ArticleDOI
Determination of ocr in clays by piezocone tests using cavity expansi0n and critical state c0ncepts
TL;DR: For piezocone penetration in clays, cavity expansion theory describes both the point resistance and induced excess pore water pressure in terms of the undrained shear strength (Cu) and rigidity index (Ir = G/Cu) as mentioned in this paper.
Journal ArticleDOI
Plasticity solutions for soil behaviour around contracting cavities and tunnels
Hai-Sui Yu,R. K. Rowe +1 more
TL;DR: In this article, analytical and semi-analytical solutions are presented for unloading of both cylindrical and spherical cavities from in-situ state of stresses under both drained and undrained conditions.
Journal ArticleDOI
Analysis of Cavity Expansion in Sand
Rodrigo Salgado,Mark Randolph +1 more
TL;DR: In this paper, a simple numerical analysis that provides the solution to both problems simultaneously is presented, taking full account of the flow rule and dependence of the friction angle on stress state.
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.