13 results
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2. Analysis of instrumented sharp cone and pressuremeter tests in stiff sensitive clay.
- Author
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Abou-Samra, G. and Silvestri, V.
- Subjects
FIELD research ,CLAY ,SHEAR testing of soils ,SOIL testing ,COLLOIDS ,FORAGE ,SOILS - Abstract
The objective of this paper is to compare field test results obtained in a stiff sensitive clay from Quebec using prebored, instrumented sharp cone tests (ISCTs) with those deduced from prebored and self-boring pressuremeter tests (PMTs and SBPMTs, respectively) and vane shear tests (VSTs). Comparisons are also made with triaxial test results. It is shown that undrained shear strengths S
u deduced from PMTs and ISCTs are greatly overestimated with respect to the values inferred from SBPMTs and VSTs. As for the shear modulus G, the opposite is true. These discrepancies are considered to arise from initial disturbance and unloading caused by drilling of pilot holes in the case of PMTs and ISCTs. Interpretation problems may be also related to the existence of very high lateral pressures at rest in the clay deposit. L’objectif de cet article est de comparer les résultats d’essais in situ obtenus dans une argile sensible raide du Quebec à l’aide d’essais au cône effilé instrumenté préforé « ISCT »avec ceux déduits d’essais au pressiomètre autoforeur et préforé « SBPMT et PMT, respectivement , et d’essais scissométriques de chantier « VST ». Une comparaison est effectuée aussi avec les résultats obtenus au laboratoire au moyen d’essais triaxiaux. Il est montré que les valeurs de la résistance au cisaillement non drainé Su , déduites des essais pressiométriques et au cône effilé préforés, sont beaucoup plus élevées que celles obtenues au pressiomètre autoforeur et au scissomètre. Par contre, les modules de cisaillement G sont beaucoup plus faibles dans les essais pressiométriques et au cône effilé préforés. Ces différences sont probablement dues au remaniement et au déchargement initial du sol, causés par le forage des avant-trous utilisés pour effectuer les essais au pressiomètre et au cône effilé préforés. Les problèmes d’interprétation peuvent être aussi le résultat de l’existence de pressions latérales au repos très élevées dans le dépôt argileux. [ABSTRACT FROM AUTHOR]- Published
- 2008
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3. Revising the areal extent of post-earthquake inspections of dams in Quebec.
- Author
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Lamontagne, Maurice and Dascal, Oscar
- Subjects
EARTHQUAKE hazard analysis ,DAMS ,SAFETY ,EARTHQUAKE magnitude - Abstract
Copyright of Canadian Geotechnical Journal is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2006
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4. Hydraulic conductivity of compacted tills from northern Quebec.
- Author
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Leroueil, Serge, Le Bihan, Jean-Pierre, Sebaihi, Samira, and Alicescu, Viad
- Subjects
HYDRAULICS ,FLUID mechanics ,PHYSICS - Abstract
The hydraulic conductivity of six compacted tills from northern Quebec with different grain-size distributions has been studied in saturated conditions in the laboratory. The results show that compaction conditions play an important role in hydraulic conductivity. When considering the hydraulic conductivities of specimens compacted at degrees of saturation greater than the optimum, there is a good correlation with the content of clay-size particles. This paper provides a good practical tool for evaluating preliminary hydraulic conductivity values of compacted tills from northern Quebec on the basis of their grain-size distribution and compaction conditions.Key words: till, hydraulic conductivity, grain-size distribution, compaction conditions.La conductivité hydraulique de six tills du nord québécois présentant des granulométries différentes a été étudiée en conditions saturées, en laboratoire. Les résultats montrent que les conditions de compactage jouent un rôle important dans la conductivité hydraulique qui en résulte. Lorsque l'on considère les conductivités hydrauliques mesurées sur des échantillons compactés à des degrés de saturation plus élevés que celui à l'optimum, on obtient une bonne corrélation avec le pourcentage de particules de dimensions argileuses. Cet article fournit donc un bon outil pratique pour une évaluation préliminaire de la conductivité hydraulique des tills du nord québécois sur la base de leur granulométrie et des conditions de compactage.Mots clés : till, conductivité hydraulique, granulométrie, conditions de compactage. [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
5. Evaluation of preconsolidation pressure and the overconsolidation ratio from piezocone tests of clay deposits in Quebec.
- Author
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Demers, Denis and Leroueil, Serge
- Subjects
CLAY ,SOIL consolidation ,PRESSURE ,TESTING - Abstract
The preconsolidation pressure and overconsolidation ratio profiles are the most important factors related to the mechanical behaviour of clay deposits. They are interpreted on the basis of a limited number of laboratory tests, but the near-continuous information provided by the piezocone can allow local data to be extrapolated to an entire site. Numerous methods have been proposed for relating piezocone data to preconsolidation pressure and the overconsolidation ratio, but their validity is still uncertain. In this paper, nine methods are compared on the basis of data collected on 31 sensitive clay sites in Quebec whose preconsolidation pressure profiles are well known. Each method is briefly presented and the most promising are identified. The simplest method, which directly relates preconsolidation pressure to net tip resistance, also appears to be the most effective.Key words: clay, preconsolidation pressure, overconsolidation ratio, piezocone, correlations.Les profils de pression de préconsolidation et du rapport de surconsolidation constituent les éléments les plus importants en ce qui concerne le comportement mécanique des dépôts argileux. Leur évaluation se fait par un nombre limité d'essais de laboratoire, mais les données fournies par le piézocône de manière presque continue peuvent permettre une extrapolation à l'ensemble du site de ces données locales. De nombreuses méthodes ont été proposées pour corréler les données du piézocône et la pression de préconsolidation ou le rapport de surconsolidation mais leur validité est encore incertaine. Dans le présent article, neuf méthodes sont examinées à partir de données provenant de 31 sites d'argile sensible de la province du Québec pour lesquels les profils de pression de préconsolidation sont bien connus. Chaque méthode est brièvement présentée et les méthodes les plus intéressantes sont identifiées. Il semble que la relation entre la pression de préconsolidation et la résistance en pointe nette, qui est la plus simple, est aussi la plus efficace.Mots clés : argile, pression de préconsolidation, rapport de surconsolidation, piézocône, corrélations. [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
6. Use of in situ penetration tests in pavement evaluation.
- Author
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Konrad, J -M and Lachance, D
- Subjects
PAVEMENTS ,ROADS ,SOILS ,PHYSICAL geology - Abstract
This paper presents the results of an extensive field investigation of several instrumented road sections in the Province of Quebec, Canada. Falling-weight deflectometer tests, static load tests on embedded plates at different depths, large dynamic cone penetration (DCP) tests, and piezocone tests (CPTU) were performed to study the mechanical response of the pavement. A correlation between elastic deformation modulus inferred from the plate load tests and DCP penetration index was obtained for nine different sites. A correlation between the equivalent elastic modulus of uniform subgrade soils and piezocone tip resistance was also established using data from the falling-weight deflectometer. A procedure for calculating the deflection basin for any pavement system placed over a more complex subgrade stratigraphy was proposed using these correlations. The proposed procedure was validated on two sites and its performance was adequate, since the calculated deflection basins agreed well with the measured deflection basins.Key words: penetration test, piezocone, deflection, pavement, in situ.Cet article présente les résultats d'une étude élaborée sur le terrain de plusieurs sections de route instrumentées dans la Province de Québec, Canada. Des essais au déflectomètre à masse tombante, de chargement statique sur des plaques enfouies à différentes profondeurs, de pénétration dynamique d'un gros cône (DCP), et de piézocône (CPTU) ont été réalisés pour étudier la réponse mécanique de la chaussée. Une corrélation entre le module de déformation élastique déduit des essais de chargement de plaques et l'indice de pénétration DCP a été obtenue pour neuf sites différents. Une corrélation entre le module élastique équivalent des sols de fondations uniformes et la résistance en pointe du piézocône a aussi été établie au moyen des données du déflectomètre à masse tombante. En partant de ces corrélations, on a proposé une procédure pour calculer le bassin de déflexion pour n'importe quel système de chaussée reposant sur une stratigraphie d'infrastructure complexe. La procédure proposée a été validée sur deux sites et sa performance a été adéquate puisque les bassins de déflexion calculés concordaient bien avec les valeurs mesurées.Mots clés : essai de pénétration, piézocône, déflexion, chaussée, in situ.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2001
- Full Text
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7. Modeling the viscoplastic behaviour of clays during consolidation: application to Berthierville clay in both laboratory and field conditions.
- Author
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Kim, Yun Tae and Leroueil, S
- Subjects
VISCOPLASTICITY ,CLAY ,SOIL consolidation ,STRAINS & stresses (Mechanics) - Abstract
To analyze the effects of strain rate and viscoplastic strain on consolidation of natural clay, this paper presents a nonlinear viscoplastic model in which viscoplastic behaviour is modeled by a unique effective stress (σ'[sub v] ) – viscous strain (ℇ[sub v] ) – viscous strain rate (ℇ[sup ·] [sub v] ) relationship. The proposed model can consider the effects of strain rate and viscoplastic strain on consolidation, to take into account the difference in strain rate between laboratory and field conditions, and the combined processes of generation and dissipation of pore pressure during consolidation. This model can also predict the behaviour of clay during stepwise loading, constant rate of strain, and relaxation of effective stress. The predicted values using numerical analysis are compared with measured values in laboratory tests and in situ, under an embankment built on soft clay at Berthierville, Quebec. It is possible to estimate the consolidation behaviour of natural clay with reasonable accuracy using the proposed nonlinear viscoplastic model.Key words: consolidation, soft clay, strain rate, viscoplastic, relaxation.Dans le but d'analyser les effets de la vitesse de déformation et de la déformation viscoplastique sur la consolidation de l'argile naturelle, cet article présente un modèle viscoplastique non linéaire dans lequel le comportement est modélisé par une relation unique contrainte effective-déformation visqueuse-vitesse de déformation visqueuse σ'[sub v] – ℇ[sub v] – ℇ[sup ·] [sub v] . Le modèle proposé peut prendre en considération les effets de la vitesse de déformation et de la déformation viscoplastique sur la consolidation pour tenir compte de la différence dans les vitesses de déformation entre les conditions en laboratoire et sur le chantier, de même que les processus combinés de génération et de dissipation de la pression interstitielle durant la consolidation. Ce modèle peut aussi prédire le comportement de l'argile en incluant le chargement par étape, la vitesse de déformation constante, et la relaxation de la contrainte effective. Les valeurs prédites au moyen de l'analyse numérique sont comparées avec celles mesurées dans les essais en laboratoire et in situ sous un remblai construit sur de l'argile molle à Berthierville, Québec. Il est possible d'estimer le comportement en consolidation de l'argile naturelle avec une précision raisonnable au moyen du modèle viscoplastique non linéaire proposé. Mots clés : consolidation, argile molle, vitesse de déformation, viscoplastique, relaxation.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Published
- 2001
- Full Text
- View/download PDF
8. Assessment of self-boring pressuremeter tests in sensitive clay.
- Author
-
Silvestri, Vincenzo
- Subjects
ANALYSIS of clay ,BORING & drilling (Earth & rocks) - Abstract
Analyzes field test results obtained by means of the Cambridge self-boring pressuremeter (SBMP) in a sensitive Champlain clay in Louiseville, Quebec. Parameters obtained from the interpretation of SBMP; Details of the use of stress paths; Properties of the soil encountered at the site.
- Published
- 2003
- Full Text
- View/download PDF
9. Assessing hydraulic conductivities of a compacted dam core using geostatistical analysis of construction control data.
- Author
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Smith, M. and Konrad, J.-M.
- Subjects
GEOLOGICAL statistics ,HYDRAULICS ,EARTH dams ,COMPACTING ,TEMPERATURE measurements ,NORD-du-Quebec (Quebec) - Abstract
Copyright of Canadian Geotechnical Journal is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2011
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10. Impacts of permafrost degradation on a road embankment at Umiujaq in Nunavik (Quebec), Canada.
- Author
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Fortier, Richard, LeBlanc, Anne-Marie, and Yu, Wenbing
- Subjects
PERMAFROST ,EMBANKMENTS ,MATHEMATICAL models ,THAWING ,GEOPHYSICAL surveys - Abstract
Copyright of Canadian Geotechnical Journal is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2011
- Full Text
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11. Use of terrestrial laser scanning for the characterization of retrogressive landslides in sensitive clay and rotational landslides in river banks.
- Author
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Jaboyedoff, Michel, Demers, Denis, Locat, Jacques, Locat, Ariane, Locat, Pascal, Oppikofer, Thierry, Robitaille, Denis, and Turmel, Dominique
- Subjects
LANDSLIDES ,CLAY ,TIME series analysis ,GLOBAL Positioning System - Abstract
Copyright of Canadian Geotechnical Journal is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2009
- Full Text
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12. Fracture network analysis of the St-Eustache quarry, Quebec, Canada, for groundwater resources management.
- Author
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Lemieux, Jean-Michel, Kirkwood, Donna, and Therrien, René
- Subjects
GEOGRAPHIC network analysis ,QUARRIES & quarrying ,SEDIMENTARY rocks ,GROUNDWATER ,HYDROGEOLOGY - Abstract
Copyright of Canadian Geotechnical Journal is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2009
- Full Text
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13. Oxygen diffusion and consumption in low-sulphide tailings covers.
- Author
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Demers, Isabelle, Bussière, Bruno, Mbonimpa, Mamert, and Benzaazoua, Mostafa
- Subjects
METAL tailings ,SULFIDE metallurgy ,OXYGEN ,CLIMATOLOGY ,DIFFUSION - Abstract
Copyright of Canadian Geotechnical Journal is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2009
- Full Text
- View/download PDF
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