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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Dissertation
Endommagement des roches argileuses et perméabilité induite au voisinage d'ouvrages souterrains
TL;DR: In this article, a caracterisation experimentale du comportement hydromecanique de de two roches argileuses (largile de Boom (site de Mol, Belgium) and largile a Opalinus (site du Mont Terri, Suisse) is described.
Journal ArticleDOI
Numerical optimization applying trust-region reflective least squares algorithm with constraints to optimize the non-linear creep parameters of soft soil
TL;DR: In this paper, a non-linear elastic visco-plastic (EVP) model is used to estimate the settlement properties of Ottawa clay and the model parameters are obtained by applying the developed method to the available laboratory consolidation results of clay samples.
Journal ArticleDOI
Weathering of a lime-treated clayey soil by drying and wetting cycles
TL;DR: In this article, the effects of successive drying/wetting cycles on the hydro-mechanical properties of a lime-treated clay-ey soil are considered, and the effect of quicklime dosage and curing time were considered.
Journal ArticleDOI
Tropical residual soils. Geological Society Engineering Group Working Party Report
TL;DR: In the field of tropical residual soils, a considerable gap between scientific and engineering knowledge is identified as mentioned in this paper, leading to considerable confusion as to what defines a residual soil, how it is formed and what its properties are.
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An elasto-plastic constitutive model for soft rock with strain softening
Toshihisa Adachi,Fusao Oka +1 more
TL;DR: In this paper, an elasto-plastic constitutive model for soft rock is derived by introducing a stress history tensor, which is evaluated through a comparison of the calculated results and the experimental results of tests on sedimentary soft rock.
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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