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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Reconstitution: what makes an appropriate reference material?
Journal ArticleDOI
The Mechanical Behaviour of a Pyroclastic Rock: Yield Strength and “Destructuration” Effects
Stefano Aversa,A. Evangelista +1 more
TL;DR: In this paper, the authors presented the stress-strain curve pattern and the mean stress influence on the shear behavior of a homogenous volcanic tuff found in the centre of the city of Naples (Italy).
Journal ArticleDOI
Constitutive Model for Cement Treated Clay in a Critical State Frame Work
TL;DR: In this paper, a plasticity-based constitutive model for the description of cement treated clay is presented, which uses a bonding stress ratio m and λ'(p', e) for the simulation of cement-treated clay.
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On the mechanical behaviour of dredged submarine clayey sediments stabilized with lime or cement
TL;DR: In this article, the authors present the preliminary results of experimental research into the stabilization of clayey sediments dredged from the Port of Taranto (Italy) with cement and (or) lime.
Journal ArticleDOI
Yielding of Microstructured Geomaterial by Distinct Element Method Analysis
TL;DR: In this paper, a macro-and micro-study on the yielding of micro-structured geomaterials by numerical experiments is presented, and the results indicate that preconsolidated pressure appears to attribute to bond and looseness in the geommaterials, and an increase in void ratio leads to a decrease in yielding stress in one-dimensional tests.
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.
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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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