Journal ArticleDOI
The general and congruent effects of structure in natural soils and weak rocks
S. Leroueil,P. R. Vaughan +1 more
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In this article, the engineering properties of naturally occurring sedimentary and residual deposits which are usually treated in geotechnical engineering as ‘soils’ are reviewed, and it is shown that usually they have characteristics due to bonded structure which are similar to those of porous weak rock.Abstract:
The engineering properties of naturally occurring sedimentary and residual deposits which are usually treated in geotechnical engineering as ‘soils’ are reviewed, and it is shown that usually they have characteristics due to bonded structure which are similar to those of porous weak rock. While this structure can arise from many causes, its effects follow a simple general pattern that involves stiff behaviour followed by yield. This yield can be described in a similar way to that occurring due to overconsolidation, although it is a separate phenomenon. The effects of structure are as important in determining engineering behaviour as are the effects of initial porosity and stress-history, which are the basic concepts of soil mechanics. As it can be described in a general way, it is concluded that structure and its effects should be treated as a further basic concept of equal importance. L'article passe en revue les proprietes des depots sedimentaires et residuels naturels qui sont nor-malement traites comm...read more
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Proceedings ArticleDOI
Characterization of Soft Deepwater West Africa Clays: SHANSEP Testing is Not Recommended for Sensitive Structured Clays
Manh-Hai Le,J. F. Nauroy,Vincenzo De Gennaro,Pierre Delage,Etienne Flavigny,Nguyen Thanh,Jean-Louis Colliat,Alain Puech,J. Meunier +8 more
TL;DR: In this article, the SHANSEP triaxial testing procedure was applied to the soft Gulf of Guinea clays from an oilfield located in 1,300 metres of water.
Journal ArticleDOI
A finite deformation multiplicative plasticity model with non–local hardening for bonded geomaterials
TL;DR: In this paper, a finite deformation, isotropic hardening, non-associative elastic-plastic constitutive model (FD _ Milan model) is presented for describing the mechanical behavior of a wide range of bonded natural geomaterials such as stiff overconsolidated clays, porous soft rocks or bio-improved soils.
Journal Article
Optimal stabilisation of deltaic laterite
O Omotosho,O J Eze-Uzomaka +1 more
TL;DR: In this article, samples of deltaic lateritic soils were subjected to mechanical (with or without controlled sand addition), cement and cement-sand (composite) stabilisation methods to improve strength for improved engineering applications.
Journal ArticleDOI
Mechanical behavior of artificially cemented clay with open structure: Cell and physical model analyses
TL;DR: In this article, the authors developed an innovative method of artificially preparing cemented clay with relatively large void ratio and explored the properties of the clay through cell and physical model tests, and found that interparticle bonds were primarily responsible for enhanced structural yield stress in compression tests on the clay; the consolidation process damaged the soil structure while simultaneously densifying it.
Some Recent Developments in Constitutive Modelling of Soft Clays
TL;DR: In this paper, the constitutive models for soft clays are presented, which are relatively simple hierarchical models, which enable model features to be switched on and off dependent on the problem to be solved, and demonstrate the importance of accounting for anisotropy and its evolution when modelling the viscous behaviour of soft soils.
References
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Journal ArticleDOI
On The Yielding of Soils
TL;DR: In this paper, Hvorslev's equation for the shear strength of clay is shown to define a surface in a space of three variables σ, e and τ. The progressive yielding of a sample defines a loading path in this space, and the paths taken by samples in differing tests can be correlated if a boundary energy correction is applied.
Journal ArticleDOI
Stress–strain–strain rate relation for the compressibility of sensitive natural clays
TL;DR: In this paper, four types of oedometer tests (constant rate of strain tests, controlled gradient tests, multiple-stage loading tests and creep tests) were carried out on a variety of Champlain sea clays.
Journal ArticleDOI
Cemented sands under static loading
TL;DR: In this paper, a test program was undertaken to define the nature of the cementation and its effect on behavior of the soils, and a total of 137 laboratory compression and tension load tests were performed on undisturbed samples of naturally and artificially prepared cemented sands.
Journal ArticleDOI
Ninth Laurits Bjerrum Memorial Lecture: "Small is beautiful"—the stiffness of soils at small strains
TL;DR: In this paper, the authors show how field measurements of displacement around foundations and excavations combined with numerical analysis and recent developments in laboratory techniques can be used to estimate the displacement of foundations.
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