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
A study of the factors which govern the compressibility of chalk.
TL;DR: In this paper, the authors investigated the factors that control mass compressibility of intact and discontinuous chalk and found that the main factors which governed the mass compressible of chalk were found to be material yield stress, true contact area ratio and discontinuity aperture.
Journal ArticleDOI
Landslide Susceptibility in Cemented Volcanic Soils, Ask Region, Iran
TL;DR: In this article, a susceptible slope in the volcanic region of Ask has been modeled using finite difference and finite element methods to find the appropriate analysis method for slope stability assessment of volcanic soils.
Journal ArticleDOI
An elastoplastic description of frictional destructuration in natural clays and shales
TL;DR: In this paper, a structure-dependent critical state friction angle within the subloading yield framework is introduced to capture subtle irreversible degradation of the structured critical state line which also serves as the threshold between contractive and dilatant volume changes.
Journal ArticleDOI
Mathematical capture of failure processes in elastoplastic geomaterials
TL;DR: A procedure for achieving a unified definition of failure in elastoplastic geomaterials, which is closely linked to the theory of controllability and encompasses the intuitive notions of ‘hardening’ and ‘softening” as particular cases is described.
Dissertation
Radial Consolidation of Pore Pressure Induced by Pile Driving
TL;DR: In this paper, a numerical model is used to simulate pile installation and subsequent pore pressure dissipation, and the predicted consolidation time is shortest for the overconsolidated low-plastic case, and longest for the normally consolidated case with high plasticity.
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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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