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the influence of mineral variability of callovooxfordian

The influence of mineral variability of Callovo-Oxfordian clay rocks on ...

In the case of the Callovo-Oxfordian clay rock Savoye et al. (2012b) measured an accessible porosity for 36 Cl À of 44.6 ± 7.0% of the total porosity. Jacquier et al. (2013) reported for the same...

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In Situ Investigation of the THM Behavior of the Callovo-Oxfordian ...

The Callovo-Oxfordian sedimentary layer is characterized by a dominant clay fraction rich in carbonates, quartz, minor feldspars and accessory minerals. On average, the COx claystone contains 25-55% clay minerals, 20-38% carbonates, 20-30% quartz, 1% feldspar and small amounts of other inclusions (Andra 2005 ).

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(PDF) Thermal Volume Changes and Creep in the Callovo-Oxfordian ...

Thermal Volume Changes and Creep in the Callovo-Oxfordian Claystone

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The influence of mineral variability of Callovo-Oxfordian clay rocks on ...

The upper part of the Callovo-Oxfordian clay-rich rock formation (C2c unit) (Meuse/Haute-Marne, France) displays large variations in mineralogical com.

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Geological Disposal: Building Confidence Using Multiple Lines Of ...

Cov-GeoDisp Build Confid 430914/05/0418:04Page 1Radioactive Waste ManagementGeological Disposal: Building Conf...

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The influence of mineral variability of Callovo-Oxfordian clay rocks on ...

The purpose of the present study is to analyse how variations in mineral composition, within the C2c unit, might affect the transfer properties of the rocks, especially for rock samples with low clay mineral contents (from a few % to 20%). All samples were selected within the same 3 metre thick layer.

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Preferred orientations and anisotropy in shales: Callovo-Oxfordian ...

A Callovo-Oxfordian shale from Meuse/Haute-Marne shows a relatively weak alignment of clay minerals and a random distribution for calcite. Opalinus shales from Benken and Mont Terri show strong alignment of illite-smectite, kaolinite, chlorite, and calcite.

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Fundamental aspects of the hydromechanical behaviour of Callovo ...

As many claystones, the Callovo-Oxfordian claystone is sensitive to variations in air and water content. In fact, drilling/cutting/shaping processes necessary for samples preparation prior to testing provoke always a limited desaturation of the sample. The resaturation (like the desaturation) generates a gradient of water content inside the sample.

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Les isotopes du lithium - Tel Archives ouvertes

Transcription . Les isotopes du lithium - Tel Archives ouvertes

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Fluid migration in the mantle wedge: Influence of mineral grain size ...

We apply a range of fluid influx patterns and subduction parameters to better understand the variation in fluid migration behavior. While fluid migration is modeled throughout the creeping region, the most relevant and critical result of this study comes from the region near the base of the mantle wedge, where the spatial variations of both ...

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Bilan 2009-2012 - ISTeP - studylibfr

Vague D : campagne d'évaluation 2012-2013 45 UMR 7193 iSTeP Bilan 2009-2012 de l'équipe « Biominéralisations et environnements Sédimentaires» (BES) 1. Composition et évolution de l'équipe L'équipe LBES de l'ISTeP est une évolution de la JE2477 UPMC « Biominéralisations et Paléoenvironnements » créée en 2005 par M ...

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Assessment of Swelling Pressure Determination Methods with Intact ...

The Callovo-Oxfordian (COx) claystone has been currently considered as a possible host rock in deep geological disposal of high-level radioactive waste by the French Radioactive Waste Management Agency (ANDRA) in France, due to its favorable low permeability, low diffusion coefficient and high retention capacity for radionuclides (ANDRA 2005 ).

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ANDRA International Workshop on Geomechanics

Free essays, homework help, flashcards, research papers, book reports, term papers, history, science, politics

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Contaminant Geochemistry: Interactions and Transport in the Subsurface ...

A description of mineral and organic components in porous media is followed by a discussion of the electrically charged surface properties that affect the near solid phase water. The composition of the subsurface water solution as affected by the surrounding solid phase, by the natural biological environment, and possibly by human factors also ...

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mass measurement by DXA: Influence of analysis ... - DeepDyve

Interunit variability among densitometers is due to different factors, including different calibration procedures and algorithms and variability in photon source energies and/or intensities. Other factors, such as the choice of scan parameters or the analysis procedures, can also introduce variability. The new generation of dual‐energy x‐ray absorptiometry (DXA) has partially improved ...

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Investigation on anisotropy of mechanical properties of Callovo ...

Anisotropic mechanical properties of the sedimentary Callovo-Oxfordian clay rock were investigated with triaxial compression and extension, cyclic compression, and creep tests. The tested...

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Gas transport properties through intact and fractured Callovo-Oxfordian ...

Abstract A series of controlled water and gas experiments was undertaken on samples of Callovo-Oxfordian (COx) mudstone using a synthetic fluid and helium gas. Data from this study demonstrate that the advective movement of gas through COx is accompanied ...

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CORE

The results indicate that simple linear regressions using only elastic wave velocities (a) accounted for more than 81% of the vertical variability of the clay content in the COx formation (i.e., coefficient regression R-2 values greater than 81%) and (b) enable the estimation of clay content with the same accuracy as the spectral GR approach.

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(PDF) Mineralogical variability of Callovo-Oxfordian clays from the ...

the relative abundance of clay minerals is estimated at ±5% from the area of the main diffrac- (1) the first one, characterised by abundant kaolin- tion peaks [4,39,46] using the macdiff software [44]. ite (45 to 50%) and illite (25-30%), coincides with the lower callovian oobioclastic limestones (calloviense zone); (2) from 472.1 to 418.7 .

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On sorption and swelling of CO2 in clays (pdf) | Paperity

Most caprocks are composed of clays as dominant mineral type which can typically be illite, kaolinite, chlorite or smectite. A number of recent studies addressed the interaction between CO2 and these different clays and it was shown that clay minerals adsorb considerable quantities of CO2.

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Observations of heterogeneous pore pressure distributions in ... - DeepDyve

Abstract The concept of effective stress is one of the basic tenets of rock mechanics where the stress acting on a rock can be viewed as the total stress minus the pore water pressure. In many materials, including clay-rich rocks, this relationship has been seen to be imperfect and a coefficient (χ) is added to account for the mechanical properties of the clay matrix. Recent experimental ...

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Mineralogical variability of Callovo-Oxfordian clays from the Paris ...

(PDF) Mineralogical variability of Callovo-Oxfordian clays from the Paris Basin and the Subalpine Basin Mineralogical variability of Callovo-Oxfordian clays from the Paris Basin and the Subalpine...

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Thermal Volume Changes and Creep in the Callovo ... - SpringerLink

The Callovo-Oxfordian (COx) claystone is considered as a potential host rock for high-level radioactive waste disposal at great depth in France. Given the exothermic nature of radioactive wastes, a temperature elevation planned to be smaller than 100 °C will affect the host rock around the disposal cells.

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Frontiers | Dynamics of Water Absorption in Callovo-Oxfordian Claystone ...

The Callovo-Oxfordian claystone is a material with notoriously complex hydro-mechanical behaviour. Combined neutron and x-ray tomography modalities are used for the first time to characterise the dynamics of water absorption in this material by comparing material deformation as well as water arrival.

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Geostatistical characterization of Callovo-Oxfordian clay variability ...

The influence of mineral variability of Callovo-Oxfordian clay rocks on radionuclide transfer properties Article Sep 2013 APPL CLAY SCI Philippe Jacquier D. Hainos a J.C. Robinet C. Ferry View ...

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(PDF) Characterization of iodide retention on Callovo-Oxfordian ...

Characterization of iodide retention on Callovo-Oxfordian argillites and its influence on iodide migration ... Understanding Variation in Partition Coefficient, Kd, Values. Volume 1: The Kd Model, Methods of Measurement, and Application of Chemical Reaction Codes ... Distribution of rare elements in mineral-forming environments of rare-metal ...

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A Magnetic Geothermometer in Moderately Buried Shales - Academia.edu

Shales contain magnetic minerals generally at very low concentrations. In the early stages of diagenesis, the inherited magnetic minerals are altered, while magnetic nanominerals are formed. In this study, we proposed a study of shales over a

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Rce 10 | PDF | Meteorización | Roca sedimentaria - Scribd

An example of the influence of physical and chemical weathering on shear strength was discussed by Spears & Taylor (1972). They presented drained triaxial shear strength data of in-situ Coal Measures mudrocks samples. Strength was measured for different states: from undisturbed to completely disturbed samples.

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Geomechanics and geodynamics of rock masses: proceedings of the 2018 ...

Quantitative assessment of variability in values of Geological Strength Index (GSI) A. Bedi, M. Invernici & J.P. Harrison 599 The effect of stress level on the compressive strength of the rock samples subjected to cyclic loading M.H. Beşer & K. Aydiner 605 Normandy cliff stability: Analysis and repair J.-L. Briaud 611

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Colors in Minerals - Eastern New Mexico University

The color produced by chromium in these two gems is different because of the influence of the surrounding atoms in the crystal structure (the crystal field) and differences in the nature and strength of chemical bonds. In rubies, there is strong absorption in the regions of violet, green, and yellow light that yields the characteristic red color.

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Spatial distribution of porosity and minerals in clay rocks from the ...

The influence of mineral variability of Callovo-Oxfordian clay rocks on radionuclide transfer properties Article Sep 2013 APPL CLAY SCI Philippe Jacquier D. Hainos a J.C. Robinet C. Ferry View ......

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EXPERIMENTAL INVESTIGATION OF THE INTERACTION OF ... - GeoScienceWorld

Initially, each of the four samples selected as representative of the mineralogical transition in this Callovo-Oxfordian formation consists of a mixture of three main clay phases: discrete illite, discrete smectite and a randomly interstratified mixed-layered mineral (MLM) containing ~65% of non-expandable layers.

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(PDF) Modelling of the short-term influence of shotcrete on the ...

Modelling of the short-term influence of shotcrete on the excavated damage zone around galleries in Callovo-Oxfordian claystone

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Engineering Geology and Geotechnics for Infrastructure development in ...

Lecture Notes in Earth Sciences Editors: S. Bhattacharji, Brooklyn H. J. Neugebauer, Bonn J. Reitner, Göttingen K. Stüw...

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(PDF) Mineralogical variability of Callovo-Oxfordian clays from the ...

The relative abundance of clay minerals is estimated at ±5% from the area of the main diffrac- (1) the first one, characterised by abundant kaolin- tion peaks [4,39,46] using the MacDiff software [44]. ite (45 to 50%) and illite (25-30%), coincides with the Lower Callovian oobioclastic limestones (Calloviense zone); (2) from 472.1 to 418.7 ...

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Water retention properties of the Callovo-Oxfordian claystone

The results show that water content changes between 3% (at 150 MPa of suction) and 12% Wetting/drying cycles at zero suction, with a shrinkage of 1.4% (at 150 MPa of suction) and a 7% swelling at zero suction.

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The Status of Water in Swelling Shales: An Insight from the Water ...

The COx claystone is a sedimentary rock deposited 155 millions years ago on top of a layer of Dogger limestone that was afterwards covered by an Oxfordian limestone layer. The thickness of the COx layer is about 150 m. The COx claystone is composed of a clay matrix containing some detritic grains of quartz and calcite.

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Porous Rock Fracture Mechanics. with Application to Hydraulic ...

Chemical attacks may result in mechanical properties deterioration and influence the fracture properties of the intact rocks. The chemically and physically altered rock surfaces exhibit significant effects on the coefficient of friction between rock surfaces. ... Figure 2.9 Variation of uniaxial compressive strength with loading orientation (α ...

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Physical Properties of Minerals - Tulane University

Two minerals of note have differences in hardness depending on direction: Kyanite has a hardness of 5 parallel to the length of the crystal, and a hardness of 7 when scratched along a direction perpendicular to the length. Calcite has a hardness of 3 for all surfaces except the {0001} plane. On {0001} it has a hardness of 2.

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Clay Minerals in Nature - Their Characterization Modification and ...

The Mineral Surveys carried out broad reconnaissance of mineral resources of the two Protectorates with the prospect of using the raw materials for industries in Britain. In course of these activities, such deposits as Tinstone, Columbite Limestone, Bitumen, Lead-zinc Ores, Coal, Clays, Iron Ore, Gold, and Marble etc were discovered in various ...

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