Relevant bibliographies by topics / Compaction band

Academic literature on the topic 'Compaction band'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Compaction band"

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Rudnicki, J. W. "Models for compaction band propagation." Geological Society, London, Special Publications 284, no. 1 (2007): 107–25. http://dx.doi.org/10.1144/sp284.8.

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Stefanou, Ioannis, and Jean Sulem. "Chemically induced compaction bands: Triggering conditions and band thickness." Journal of Geophysical Research: Solid Earth 119, no. 2 (February 2014): 880–99. http://dx.doi.org/10.1002/2013jb010342.

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Heap, Michael J., Nicolas Brantut, Patrick Baud, and Philip G. Meredith. "Time-dependent compaction band formation in sandstone." Journal of Geophysical Research: Solid Earth 120, no. 7 (July 2015): 4808–30. http://dx.doi.org/10.1002/2015jb012022.

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Czech, Krzysztof R., and Wojciech Gosk. "Impact of the Operation of a Tri-band Hydraulic Compactor on the Technical Condition of a Residential Building." Applied Sciences 9, no. 2 (January 18, 2019): 336. http://dx.doi.org/10.3390/app9020336.

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The study investigates the surface vibrations generated by a new generation, tri-band hydraulic compactor type V8 from Maschinentechnik Schrode AG (MTS), and a reversible plate compactor type DPU 6055 from Wacker Neuson in close proximity to a low-rise residential building. Compaction works were carried out in three stages, at distances: 15 m, 10 m, and 5 m from the building, and at three depths: 0.4 m, 1.2 m, and 1.8–2.0 m. The research was conducted at one measurement point, located on the outer foundation wall of the building, and at three measurement points located on the ground at distances of 1.25–7.5 m from the building. The study analyses the distribution of peak component particle accelerations at the ground, and peak component particle velocities at the foundation wall of the building as a function of the distance of compactors from the building and the depth of compaction works, as well as the mode of work of hydraulic compactor type V8 from MTS. The study contains the comparison of the permissible vibration levels that are recommended by selected European standards (DIN, BS, VSS, and PL) and an approximate assessment of the impact of vibrations on the technical condition of the residential building.
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Keehm, Youngseuk, Kurt Sternjof, and Tapan Mukerji. "Computational estimation of compaction band permeability in sandstone." Geosciences Journal 10, no. 4 (December 2006): 499–505. http://dx.doi.org/10.1007/bf02910443.

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Redanz, Pia, and Viggo Tvergaard. "Analysis of shear band instabilities in compaction of powders." International Journal of Solids and Structures 40, no. 8 (April 2003): 1853–64. http://dx.doi.org/10.1016/s0020-7683(03)00034-9.

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Robert, Romain, Pauline Souloumiac, Philippe Robion, and Christian David. "Numerical Simulation of Deformation Band Occurrence and the Associated Stress Field during the Growth of a Fault-Propagation Fold." Geosciences 9, no. 6 (June 9, 2019): 257. http://dx.doi.org/10.3390/geosciences9060257.

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Knowledge of the paleo-stress distribution is crucial to understand the fracture set up and orientations during the tectonic evolution of a basin, and thus the corresponding fluid flow patterns in a reservoir. This study aims to predict the main stress orientations and evolution during the growth of a fold by using the limit analysis method. Fourteen different steps have been integrated as 2D cross sections from an early stage to an evolved stage of a schematic and balanced propagation fold. The stress evolution was followed during the time and burial of syn tectonic layers localized in front of the thrust. Numerical simulations were used to predict the occurrence and orientation of deformation bands, i.e., compaction and shear bands, by following the kinematic of a fault-propagation fold. The case study of the Sant-Corneli-Boixols anticline was selected, located in the South Central Pyrenees in the Tremp basin, to constrain the dimension of the starting models (or prototypes) used in our numerical simulations. The predictions of the numerical simulations were compared to field observations of an early occurrence of both pure compaction- and shear-enhanced compaction bands in the syn-tectonic Aren formation located in front of the fold, which are subjected to early layer parallel shortening during the burial history. Stress magnitude and stress ratio variations define the type of deformation band produced. Our results show that the band occurrence depends on the yield envelope of the host material and that a small yield envelope is required for these shallow depths, which can only be explained by the heterogeneity of the host rock facies. In our case, the heterogeneity can be explained by a significant contribution of carbonate bioclasts in the calcarenite rock, which change the mechanical behavior of the whole rock.
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Cecinato, Francesco, and Alessandro Gajo. "Dynamical effects during compaction band formation affecting their spatial periodicity." Journal of Geophysical Research: Solid Earth 119, no. 10 (October 2014): 7487–502. http://dx.doi.org/10.1002/2014jb011060.

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Esin, Maxim, Arcady V. Dyskin, and Elena Pasternak. "Large-Scale Deformation Patterning in Geomaterials Associated with Grain Rotation." Advanced Materials Research 891-892 (March 2014): 872–77. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.872.

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Modelling of large-scale deformation patterning in geomaterials is important for predicting instabilities and failures in the Earths crust. Shear band formation and the evolution of the bands is a predominant mechanism of deformation patterning. Independent rotations of separate grains/particles can affect the pattern formation by adding the effect of rotational degrees of freedom to the mechanism of instability. To model this mechanism we use a special experimental technique based on digital image correlation in order to recover both displacement and independent rotation fields in 2D physical models of granular material. In the physical model the particles are represented by smooth steel monodispersed disks with speckles painted on them to enable the rotation reconstruction. During the loading the deformation pattern undergoes stages of shear band formation followed by its dissolution due to re-compaction and particle rearrangement with the subsequent formation of multiple shear bands merging into a single one and the final dissolution. Also, patterns of rotations are observed at an intermediate scale between the scale of the particles and the scale of the shear band.
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Chemenda, A. I. "The formation of tabular compaction-band arrays: Theoretical and numerical analysis." Journal of the Mechanics and Physics of Solids 57, no. 5 (May 2009): 851–68. http://dx.doi.org/10.1016/j.jmps.2009.01.007.

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Dissertations / Theses on the topic "Compaction band"

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Herrin, Elizabeth Anne. "Experimental study of shear and compaction band formation in berea sandstone." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3176.

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Townend, Edward. "An experimental study of compaction band evolution in an anisotropic sandstone." Thesis, University College London (University of London), 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497806.

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Cier, Honores Roberto Jesús. "Computational modelling of compaction bands in geomaterials." Thesis, Curtin University, 2022. http://hdl.handle.net/20.500.11937/89777.

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This research represents a theoretical and computational study of compaction bands in geomaterials. The first part of the work establishes a robust numerical framework for a wave-mechanics approach to the compaction band process, showing its versatility in finding solutions for a wide range of scenarios. The second part deals with compaction bands as a bifurcation problem in rate-dependent critical-state based materials for well-known geomechanical stress paths, establishing a series of statements for their onset conditions.
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Marketos, George. "An investigation of crushing and compaction bands in granular material." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611944.

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Abdallah, Youssouf. "Compaction banding in high-porosity limestones : Experimental observations and modelling." Thesis, Paris Est, 2019. http://www.theses.fr/2019PESC1024.

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La déformation des roches sédimentaires peut donner lieu à la formation de bandes de compaction, qui peuvent affecter considérablement le rendement des géosystèmes. L'objectif de cette thèse est d'identifier la formation des bandes de compaction dans les roches carbonatées poreuses à travers des essais de compression triaxiale et de proposer un modèle de comportement basé sur la théorie de plasticité du second-gradient pour prendre en compte l'effet des hétérogénéités locales.Les essais de compression axisymétrique sont combinés avec des observations tomographiques aux rayons X. Les échantillons sont scannés avant et après différents paliers de chargement et sous différents niveaux de pression de confinement. La construction de cartes de déformation 3D en utilisant la technique de corrélation d'images permet d'identifier les zones de localisation de déformation. Une méthode simple basée sur des considérations cinématiques est proposée pour identifier le type de bande de localisation obtenue. Des bandes de compaction sont identifiées sous forts confinements, des bandes de cisaillement pur sont obtenues à des faibles confinements, tandis que des bandes de cisaillement compactant sont observées dans le régime de transition. En revanche, une compaction diffuse a lieu sous chargement isotrope. D'autre part, des cartes de porosité 3D à une certaine méso-échelle intermédiaire sont construites et superposées sur les cartes de déformation. Il est observé que l'hétérogénéité de la porosité contrôle la structure des bandes de compaction qui s'étendent à l'intérieur des zones les plus poreuses et contournent les zones les plus denses. Il est également observé que l'écrasement des grains est le mécanisme dominant à l'échelle microscopique qui accompagne le mode de déformation. Des particules très fines remplissent ainsi les pores et induisent une réduction de la porosité. Dans les zones assez denses, les grands pores protégés par une structure quasi-rigide de grains cimentés restent intacts. Quand la composante de cisaillement est présente dans la bande de localisation, l'hétérogénéité de la porosité contrôle le comportement volumique. Le long d'une bande de cisaillement pur/compactant, des fissures apparaissent dans les zones denses, tandis que des phénomènes d'écrasement de grains et de remplissage des pores sont observés dans les endroits les plus poreux. Ces mécanismes sont responsables d'une coexistence complexe de compaction et de dilatation locales.Les modèles de comportement élasto-plastiques standards pour les milieux homogènes ne permettent pas de modéliser précisément la formation des bandes de compaction, car ils prévoient des bandes de localisation de déformation d'épaisseur nulle. Pour régulariser ce problème, des milieux continus d'ordres supérieurs (micromorphes) peuvent être considérés, où des longueurs internes en relation avec la microstructure sont introduites dans les lois de comportement. Une problématique particulière de ces modèles est la détermination des paramètres d'ordres supérieurs. Dans le cadre de la théorie de plasticité du second-gradient, la surface de charge dépend d'une variable interne d'écrouissage et de son second gradient. L'effondrement plastique de la porosité est considéré ici comme la variable interne. Une procédure de calage des paramètres d'ordres supérieurs supplémentaires basée sur les données mécaniques macroscopiques et les données fournies par les images obtenues par microtomographie aux rayons X est proposée. Une analyse de stabilité linéaire en conditions axisymétriques triaxiales est appliquée pour prévoir la formation des bandes de compaction. Le modèle de comportement est ensuite implémenté dans un logiciel aux éléments finis, Numerical Geolab, afin de réaliser une simulation numérique des essais. Les résultats numériques sont finalement comparés aux observations expérimentales
The mechanical deformation of sedimentary rocks can give rise to the formation of compaction bands which can significantly affect the performance of geosystems. The objective of this thesis is to identify the formation of compaction bands in porous carbonate rocks in laboratory experiments and to propose a constitutive model based on second-gradient plasticity theory to account for the effect of local heterogeneity.Axisymmetric compression tests are combined with X-Ray Computed Tomography observations. Samples are imaged before and after several loading steps and at different confining pressure levels. Digital Volume Correlation technique is applied on consecutive images to build 3D deformation maps at a millimetric gauge length, which permit to identify strain localization zones. A simple method based on kinematic considerations is proposed to classify these zones. Compaction bands have been identified at high confining pressures, pure shear bands are obtained for low confinements whereas compactive shear bands are observed in the transitional regime. In contrast, a diffuse compaction occurs in hydrostatic loading conditions. 3D porosity maps are constructed at some intermediate meso-scale and superimposed on deformation maps. The heterogeneity of porosity is found to control the pattern of compaction bands, as they lay inside high-porosity zones and avoid denser zones. Grain crushing is identified as the main micromechanism of the deformation. Very fine particles fill the pores and induce a porosity reduction. Large pores are observed to remain intact in denser zones, as they are protected by a surrounding rigid lattice of cemented grains. When shear strain is identified in deformation bands, porosity heterogeneity is found to control the volumetric behavior. Along a compactive/pure shear band, some cracks are observed in denser zones, whereas grain crushing and pore filling are observed in the more porous zones. These mechanisms are responsible for a complex co-existence of local contractancy and dilatancy along shear bands.Standard constitutive elastic-plastic laws of homogeneous media are insufficient to model correctly compaction banding, as a zero-thickness band is obtained for rate-independent materials in a Cauchy continuum. To regularize this problem, higher-order continua (micromorphic media) can be considered, where internal lengths in relation with the microstructure are introduced in the constitutive relations. A particular issue of these models is to calibrate the higher-order parameters. In the framework of second-gradient plasticity theory, the yield surface depends on a hardening parameter, related to the plastic strain and its second gradient. The plastic porosity reduction is taken here as the hardening parameter. A calibration procedure of the additional higher-order parameters based on macroscopic mechanical data and the data provided by the X-Ray images is proposed. Once the model is calibrated, a linear stability analysis in axisymmetric triaxial loading is applied to predict the formation of compaction bands. The calibrated model is subsequently implemented in a finite element code, textit{Numerical Geolab}, to perform numerical simulations of the experiments. Numerical results are finally compared to the experimental observations
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Robert, Romain. "Etude de la déformation dans une formation granulaire poreuse en régime compressif : du terrain au laboratoire." Thesis, Cergy-Pontoise, 2018. http://www.theses.fr/2018CERG0971/document.

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Les bandes de déformation sont des structures géologiques se mettant en place dans les matériels granulaires présentant une forte porosité (>15%). Ces structures peuvent être compactantes ou dilatantes et peuvent présenter une composante cisaillante. À l’échelle microscopique, il est possible d’observer une réorientation des grains, une compaction ou un cisaillement intense peut entrainer la fracturation de ces derniers (cataclase) pour former une fine zone déformée modifiant ainsi la porosité et la perméabilité de la roche. Ces bandes ont un impact sur la circulation des fluides en formant des barrières ou des drains dans le réservoir. La formation de ces structures est étroitement liée à la tectonique et aux paramètres sédimentologiques du matériel hôte. Comprendre et pouvoir prédire le mode de mise en place, les orientations et la distribution de ces bandes est l’objectif principal de cette thèse.Dans cette étude nous avons analysé un site de bandes de déformation observé dans le bassin de Tremp, au sein de la formation d’Aren, dans la zone Central Sud-Pyrénéenne. Nous avons pu définir la nature de ces structures grâce à des analyses macro- et micro-structurales couplées à une étude d’anisotropie magnétique permettant de déduire la direction de raccourcissement à l’origine de la mise en place de ces bandes. Deux principaux types de bandes cataclastiques sont alors mis en évidence: (1) des bandes de compaction pures, perpendiculaires au raccourcissement et (2) des bandes de compaction à composante cisaillante, obliques à cette même direction de raccourcissement.En comparaison avec le calendrier tectonique de la région et des données d’enfouissement relatif dans le temps de la formation étudiée. Nous avons fait l’hypothèse que ces deux familles de bandes sont apparues à faible enfouissement (< 1 km de profondeur), soit peu de temps après le dépôt et associées à la croissance du pli du Sant Corneli-Boixols. De telles structures ne sont pas communes pour un enfouissement superficiel et le faciès calcarénitique est mis en cause pour expliquer leurs apparitions.La mise en place de simulations analytiques basées sur des résultats d’expérimentations géomécaniques ont ensuite permis de contraindre le régime tectonique, l’orientation et les valeurs de ces contraintes nécessaires à la formation de ces deux types de bandes par rapport à l’enfouissement et la croissance du chevauchement. Les valeurs de contraintes attendues sont ici très faibles dans le cas d’une déformation très précoce.Enfin, nous avons testé ces observations et nos hypothèses à des modélisations numériques dans lesquelles nous avons analysé l’impact de la croissance d’un chevauchement et d’un pli de propagation de rampe. La distribution des contraintes et les potentielles bandes de déformation mises en place au sein d’un réservoir poreux situé en avant de ce pli ont été étudiées. Nous avons alors montré que nos hypothèses d’apparition superficielles de bandes de déformation étaient dépendantes de la position des enveloppes de ruptures (elles-mêmes dépendantes de la lithologie de la roche). Pour expliquer la mise en place des bandes étudiée dans ce mémoire, une résistance mécanique très faible de la roche est nécessaire pour permettre de former des bandes à moins d’un kilomètre de profondeur
Deformation bands are geological structures that occur in porous and granular material presenting a high porosity (>15%). These structures can be identified as compactive or dilatant, a shear component is also often observed. At the microscopic scale, it is possible to observe a grain rearrangement and an intense compaction and or shearing can lead to grain crushing (known as cataclasis), to form a thin deform zone that will modify the porosity and permeability of the rock. Deformation bands have a non-negligible impact on fluid flow, creating a barrier or a drain in the potential reservoir. The formation of such structures is mainly linked to the tectonic activity but also to the facies and other sedimentological parameters of the host rock. The understanding and the prediction of the occurrence and distribution of the bands is the main objective of this thesis.In this study we analyzed a deformation band site found in the Tremp basin, in the Aren formation localized in the South Central Pyrenean Zone. We defined the nature of these structures with macro and microstructural analysis and by adding a study of the magnetic anisotropy to constrain the shortening direction responsible to the band formation. We evidence two major types of bands showing different orientations and behavior: (1) Pure compaction bands (PCB), perpendicular to the shortening and (2) Shear enhanced compaction bands (SECB), oblique to the same shortening.In comparison with tectonic schedule in the studied area and time vs. burial data of the formation, we deducted that both types of bands took place at a shallow burial (<1km depth), which means short times after deposition. This localized deformation, showing mainly cataclasis, is associated to the growth of the Sant Corneli-Boixols fold and thrust belt. Such structures are not common at a shallow depth and we propose that the calcarenite facies of the host rock is the key factor to explain the band occurrence.Thereafter, we made analytical simulations based on geomechanical experimentations results that allowed us to constrain the stress state and orientations needed to create these structure and to determine the timing of formation compared to the burial of the layers during the growth of the Boixols thrust. The stresses magnitudes are expected to be really low in the case of an early deformation.Finally, we tested and compared our observations and hypothesis to numerical modeling where we analyzed the impact of the growth of a fold and thrust belt on the stress state and orientations and the analysis of potential deformation bands occurrence. The stress distribution and the potential occurrence of deformation bands in a porous reservoir presenting different characteristics and located in front of this fold were studied.With the modelizations results, we exposed that our hypothesis of shallow deformation bands are dependent from the position of failure envelopes (that are dependent on the rock lithology). To explain the band formation we studied in this thesis, a weak mechanical strength of the host rock is needed to form deformation bands at less than a depth of one kilometer. The pure compaction bands are associated to a potentially early layer-parallel shortening (LPS)
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Charalampidou, Elli Maria. "Etude expérimentale sur la localisation des déformations dans les grès poreux." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENI090/document.

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Cette étude expérimentale traite la localisation des déformations sur un grès poreux: le grès de Vosges. Un nombre des essais triaxiaux sont effectués sous des pressions de confinement (i.e., 20 MPa - 190 MPa) et des déformations axiales différentes pour mieux comprendre la réponse mécanique de ce grès. La localisation des déformations a été étudiée dans des différentes échelles en appliquant une variation de mesures de champs (full-field methods) comme la Tomographie Ultrasonore (en 2D), les Emissions Acoustiques (en 3D), les Rayons X (en 3D), et la Corrélation des Images (en 3D). Les méthodes expérimentales ont été appliquées avant, pendant et après les essais triaxiaux. Des coupes fine ont été observées sous le microscope optique et électronique (SEM). La combinaison des multiples techniques expérimentales, qui ont des différentes sensitivités et résolutions, a décrit la procédure de la formation et l’évolution des bands de déformation observées sur le grès de Vosges. Des bandes de cisaillement ont été formées sous des pressions intermédiaires et des bandes de compaction sous des pressions élevées. Des bandes de compactions pure n’ont pas été observées.Les bandes de déformations observées se sont caractérisées comme des zones de déformation de cisaillement localisée et/ou de compaction. En plus, elles se sont caractérisées comme des structures de fable vitesse ultrasonore, des places d’origine des fissures inter- ou intra- granulaires, et des places des densités de matériel élevées.Deux mécanismes principales ont été observées au niveau de grain dans les bandes de cisaillement et de bandes de compaction (shear-enhanced compaction bands): d’un cote c’est la fissuration des grains (endommagement) et de l’autre cote c’est la réduction de porosité (sur la forme de compaction). Les deux mécanismes i présent différences sur leurs proportions et leur ordre d’occurrence dans le temps
This PhD thesis presents a laboratory study aiming at a better understanding of the stress-strain response of the Vosges sandstone (porous rock) tested at a range of confining pressures (i.e., 20-190 MPa) and different axial strain levels. Localised deformation was captured at different scales by a combination of full-field experimental methods, including Ultrasonic Tomography (2D), Acoustic Emissions (3D), X-ray Tomography (3D), and 3D volumetric Digital Image Correlation, plus thin section and Scanning Electron Microscope observations (2D). These experimental methods were performed before, during and after a number of triaxial compression tests. The combined use of the experimental techniques, which have different sensitivity and resolution, described the processes of shear band and shear-enhanced compaction band generation, which formed at low to intermediate and relatively high confining pressures, respectively. Pure compaction bands were not identified. The deformation bands were characterised as zones of localised shear and/or volumetric strain and were captured by the experimental methods as features of low ultrasonic velocities, places of inter- and intra-granular cracking and structures of higher density material. The two main grain-scale mechanisms: grain breakage (damage) and porosity reduction (compaction) were identified in both shear band and shear-enhanced compaction band formation, which presented differences in the proportions of the mechanism and their order of occurrence in time
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Ahlgren, Stephen G. "The Nucleation and Evolution of Riedel Shear Zones as Deformation Bands in Porous Sandstone." Thesis, The University of Arizona, 1999. http://hdl.handle.net/10150/249273.

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Riedel shear zones are geometric fault patterns commonly associated with strike-slip fault systems. The progressive evolution of natural Riedel shear zones within the Navajo Sandstone of southern Utah is interpreted from the spatial evolution of small-scale, incipient Proto-Riedel Zones (PRZs) to better-developed Riedel shear zones using field mapping and three-dimensional digital modeling. PRZs nucleate as a tabular zone of localized shearing marked by en èchelon deformation bands, each of which is no more than a few mm wide and tens of cm long, and oriented at 55° - 85° to the trend of the zone. With increasing strain, deformation bands and sedimentary markers are sheared ductily through granular flow and assume a sigmoidal form. The temporal and spatial evolution of bands comprising a Riedel shear zone suggests that PRZs nucleate as transitional-compactional deformation bands under localized, supra-lithostatic fluid pressure. Subsequent bands develop under modified regional stresses as conjugate shear fractures within the strain- hardened axis of the PRZ. These antithetic driven systems are not compatible with traditional synthetic driven models of Riedel shear zones. Unlike most synthetic driven examples, these antithetic driven systems are not controlled by preexisting "basement" structures, thus their geometries reflect a primary propagation or secondary passive deformation mechanism.
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Charalampidou, Elli maria. "Etude expérimentale sur la localisation des déformations dans les grès poreux." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00721812.

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Cette étude expérimentale traite la localisation des déformations sur un grès poreux: le grès de Vosges. Un nombre des essais triaxiaux sont effectués sous des pressions de confinement (i.e., 20 MPa - 190 MPa) et des déformations axiales différentes pour mieux comprendre la réponse mécanique de ce grès. La localisation des déformations a été étudiée dans des différentes échelles en appliquant une variation de mesures de champs (full-field methods) comme la Tomographie Ultrasonore (en 2D), les Emissions Acoustiques (en 3D), les Rayons X (en 3D), et la Corrélation des Images (en 3D). Les méthodes expérimentales ont été appliquées avant, pendant et après les essais triaxiaux. Des coupes fine ont été observées sous le microscope optique et électronique (SEM). La combinaison des multiples techniques expérimentales, qui ont des différentes sensitivités et résolutions, a décrit la procédure de la formation et l'évolution des bands de déformation observées sur le grès de Vosges. Des bandes de cisaillement ont été formées sous des pressions intermédiaires et des bandes de compaction sous des pressions élevées. Des bandes de compactions pure n'ont pas été observées.Les bandes de déformations observées se sont caractérisées comme des zones de déformation de cisaillement localisée et/ou de compaction. En plus, elles se sont caractérisées comme des structures de fable vitesse ultrasonore, des places d'origine des fissures inter- ou intra- granulaires, et des places des densités de matériel élevées.Deux mécanismes principales ont été observées au niveau de grain dans les bandes de cisaillement et de bandes de compaction (shear-enhanced compaction bands): d'un cote c'est la fissuration des grains (endommagement) et de l'autre cote c'est la réduction de porosité (sur la forme de compaction). Les deux mécanismes i présent différences sur leurs proportions et leur ordre d'occurrence dans le temps.
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Pridhnani, Bharti. "Spaces of bandlimited functions on compact manifolds." Doctoral thesis, Universitat de Barcelona, 2011. http://hdl.handle.net/10803/123823.

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This monograph is structured in four chapters. In Chapter 1, we present the context of our problem and the main results proved in this work. We describe the asymptotic behaviour of the reproducing kernel and the construction of new kernels associated to our spaces with a decay away from the diagonal. We shall also explain some tools that will play a fundamental role in the proof of our results. In Chapter 2, we study the problem of a continuous sampling. The role of a discrete family of sampling is played now by a sequence of sets in the manifold called Logvinenko-Sereda sets. We give a complete geometric characterization. A weaker problem is to find a characterization of the Carleson's measures. This question has been also answered in terms of a geometric condition. In Chapter 3, we provide some (qualitative) necessary and sufficient conditions for interpolation and sampling. We define an analog of the Beurling-Landau's density and prove a quantitative necessary condition for sampling and interpolation following the scheme of Landau in the context of the Paley-Wiener spaces. In Chapter 4, we give an application of the density results obtained in Chapter 3 and study the Fekete arrays on compact manifolds with some restriction. Furthermore, we prove from the results of Chapter 3, the equidistribution of the Fekete families on compact manifolds that have a product property (see Definition 4.1 for more details). The results of this monograph are part of the following articles: - J. Ortega-Cerdà, B. Pridhnani. Carleson measures and Logvinenko-Sereda sets on compact manifolds. Forum Mathematicum, to appear ([OCP11b]). - J. Ortega-Cerdà, B. Pridhnani. Beurling-Landau's density on compact manifolds. Preprint ([OCP11a]).
En aquesta tesi, estudiem les famílies d'interpolació i sampling (mostreig) en espais de funcions de banda limitada en varietats compactes. Les nocions de sampling i interpolació juguen un rol fonamental en problemes com ara recuperar un senyal continu a travès de les mostres discretes. Aquestes dues nocions són, en part, de caràcter oposat: un conjunt de sampling ha de ser suficientment dens per tal de poder recuperar la informació i, en un conjunt d'interpolació, els punts han de ser suficientment separats per tal de poder trobar una funció que interpola certs valors. A grans trets, una successió de sampling per a un cert espai de funcions és una successió de punts {lambda(n)}(n) tals que la norma de tota funció “f” de l'espai és equivalent a la norma de la successió que resulta d'avaluar la funció en els punts {lambda(n)}(n). Donada una varietat compacta M de dimensió m>/= 2, considerem el subespai E(L) de L(2)(M) generat per vectors propis del Laplacià de valor propi més petit que L > 0. Aquests espais s'anomenen espais de funcions de banda limitada i són el principal motiu d'estudi de la tesi. Els espais E(L) comparteixen propietats amb els espais clàssics de Paley-Wiener i la tesi explora aquesta connexió. La tesi s'estructura en quatre capítols. En el primer capítol, introduïm el context del nostre problema i els resultats principals provats al llarg d'aquesta tesi. També descrivim el comportament asimptòtic del nucli reproductor i la construcció de nous nuclis associats als nostres espais amb un decaïment fora de la diagonal. A més a més, expliquem algunes eines que jugaran un paper fonamental en les proves dels nostres resultats. En el segon capítol, estudiem el problema del sampling continu. El rol d'una família discreta de sampling el realitza una successió de conjunts en la varietat anomenada successió de Logvinenko-Sereda. Un problema més dèbil és trobar una caracterització de les mesures de Carleson. Aquesta qüestió també s'ha resolt en termes d'una condició geomètrica. En el tercer capítol, provem algunes condicions (qualitatives) necessàries i suficients per a la interpolació i sampling. Definim l'anàleg a la densitat de Beurling-Landau i provem, seguint les idees de Landau en el context dels espais de Paley-Wiener, condicions quantitatives necessàries per a què una família sigui de sampling o d'interpolació. En el quart capítol, donem una aplicació dels resultats de densitat obtinguts en el Capítol 3. Estudiem les famíllies de punts de Fekete en varietats compactes amb certa propietat. Els punts de Fekete són punts que maximitzen un determinant del tipus Vandermond que apareix en la fòrmula d'interpolació del polinomi de Lagrange. Són punts adients per les fòrmules d'interpolació i la integració numèrica. Els punts de Fekete tenen la propietat que són casi d'interpolació i sampling. Per tant, aquest tipus de punts estan ben distribuïts en la varietat ja que contenen informació suficient per recuperar la norma L(2) d'una funció de banda limitada i, són suficientment separats per tal d'interpolar alguns valors fixats. Els resultats d'aquesta tesi són part dels següents articles: - J. Ortega-Cerdà, B. Pridhnani. Carleson measures and Logvinenko-Sereda sets on compact manifolds. Forum Mathematicum 25, no. 1, p. 151-172, 2011. - J. Ortega-Cerdà, B. Pridhnani. Beurling-Landau's density on compact manifolds. Journal of Functional Analysis 263, no. 7, p. 2102-2140, 2012.
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Book chapters on the topic "Compaction band"

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Weik, Martin H. "band compaction." In Computer Science and Communications Dictionary, 102. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_1319.

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Weik, Martin H. "tolerance band compaction." In Computer Science and Communications Dictionary, 1794. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_19709.

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Weik, Martin H. "fixed-tolerance-band compaction." In Computer Science and Communications Dictionary, 616. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_7269.

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Weik, Martin H. "variable tolerance band compaction." In Computer Science and Communications Dictionary, 1881. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_20675.

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Charalampidou, Elli-Maria, Sergei Stanchits, and Georg Dresen. "Compaction Bands in a Porous Sandstone Sample with Pre-induced Shear Bands." In Springer Series in Geomechanics and Geoengineering, 391–98. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56397-8_48.

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Castellanza, Riccardo, Eleni Gerolymatou, and Roberto Nova. "Compaction Bands in Oedoemetric Tests on High Porosity Soft Rocks." In Experimental Analysis of Nano and Engineering Materials and Structures, 969–70. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6239-1_482.

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Stanchits, Sergei, Jerome Fortin, Yves Gueguen, and George Dresen. "Initiation and Propagation of Compaction Bands in Dry and Wet Bentheim Sandstone." In Rock Physics and Natural Hazards, 846–68. Basel: Birkhäuser Basel, 2009. http://dx.doi.org/10.1007/978-3-0346-0122-1_6.

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Shteinberg, Alexander S., and Giorgi Tavadze. "Use of SHS Compaction for Manufacture of Hard Alloy Parts with Metal Bands." In SpringerBriefs in Materials, 123–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-35205-8_6.

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Prassa, Chara, Sotiris Alevizos, Manolis Veveakis, and Yannis F. Dafalias. "The Effect of Rotational and Isotropic Hardening on the Onset of Compaction Bands." In Springer Series in Geomechanics and Geoengineering, 147–53. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56397-8_19.

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Lenoir, N., J. E. Andrade, W. C. Sun, and J. W. Rudnicki. "In SituPermeability Measurements inside Compaction Bands Using X-Ray CT and Lattice Boltzmann Calculations." In Advances in Computed Tomography for Geomaterials, 279–86. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118557723.ch33.

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Conference papers on the topic "Compaction band"

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Maev, R. Gr, V. Leshchynsky, and A. Papyrin. "Structure Formation of Ni-based Composite Coatings during Low Pressure Gas Dynamic Spraying." In ITSC2006, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, R. S. Lima, and J. Voyer. ASM International, 2006. http://dx.doi.org/10.31399/asm.cp.itsc2006p0121.

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Abstract The response of Ni-SiC powders deposited by Gas Dynamic Spraying (GDS) with various particle velocities, and their compaction behavior to the different packing densities were studied in parallel. Bulk compacts (90–99% dense), made in the form of 6 mm diameter by 3 mm thick disks, were analyzed to determine the structural changes occurring within the particles and at the particle boundaries, and to examine their mechanical properties. Optical microscopy and SEM observations revealed the presence of a lamellar morphology and a strong interparticle bonding in the composite coating. An analysis of the experimental data revealed the retention of the nanoscale structure and a localized grain refinement. Adiabatic shear band areas were observed and thought to be responsible for the grain refinement. Powder layers, which were shear compacted to the packing density (up to 90% dense), showed the best densification characteristics. Correspondingly, coatings with enhanced mechanical properties and a strong exchange coupling between hard and soft phases are obtained.
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Brügger, Adrian, Bjørn Clausen, and Raimondo Betti. "Quantifying Wire Stresses in Main Cables Using Neutron Diffraction." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.1388.

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<p>Effective maintenance strategies for suspension bridges rely on a fundamental understanding of the internal mechanics of its failure-critical members, most importantly the main cables. While experimentally quantifying the development length – the distance over which a broken wire in a cable regains service stress through load transfer from surrounding wires – we found that this quantity depends heavily on the amount of local confinement force (e.g. clamping and compaction) acting on said wire. Both academics and engineering practitioners commonly use prescribed mean-field stress distributions to estimate internal cable stresses, assuming an equivalence of this discrete multi-body system to a homogeneous steel monolith. Using the SMARTS beamline at Los Alamos National Laboratory, we test this assumption by reporting direct measurements of axial stresses within each individual wire of parallel wire strands. The strands are constrained by a clamp modeled after a cable band and measurements are made around a clamp for various clamping loads while the strand is under tension. The results reveal that effective confinement of a cable section is one of the most critical variables driving the safety factor of a bridge cable.</p>
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Charalampidou, E., S. A. Hall, G. Viggiani, H. Lewis, G. D. Couples, and S. Stanchis. "Laboratory Investigation of Shear and Compaction Bands – Compaction and Dilation Identification." In 2nd EAGE International Conference on Fault and Top Seals - From Pore to Basin Scale 2009. European Association of Geoscientists & Engineers, 2009. http://dx.doi.org/10.3997/2214-4609.20147196.

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Ballas, G., R. Soliva, A. Benedicto, E. Skurtveit, and H. Fossen. "Structures and Mechanics of Shear Enhanced Compaction Bands, Provence, France." In 3rd EAGE International Conference on Fault and Top Seals. Netherlands: EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2214-4609.20143029.

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Bere, A. B. "Geomechanical Modelling of Borehole Breakouts and Compaction Bands in High-porosity Sandstones." In International Geomechanics Symposium. ARMA, 2022. http://dx.doi.org/10.56952/igs-2022-037.

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Abstract Predicting the nature and extent of deformation adjacent to wellbores can be critical for successful subsurface operations. The ability to capture the onset and evolution of failure can permit more efficient operations and circumvent or minimize the effects of well-known operational issues such as wellbore instability and sand production. In this paper, the behaviour of porous sandstones is investigated through replication of experimental testing conducted by Haimson (2004). In this work the deformation near the excavated section for highly porous sandstones was documented and analyzed, with contrasting deformational styles observed that are tentatively attributed to mineral composition. The requirements for predicting these styles are discussed and presented within a novel three-field modelling framework that incorporates a sophisticated constitutive model. Application of the workflow and results for breakout and sand control studies is discussed, along with potential future extensions to the capabilities of the constitutive model. Introduction Instability of subsurface excavations is critical and can pose serious problems affecting the timing and success of a project. Prediction of such instabilities has long been recognised as a key factor in many industries. Understanding the failure mechanisms is vital for the optimisation of well production as instabilities affect drilling efficiency, resulting in lost circulation, breakouts, or hole closure and even in loss of the open-hole section due to stuck and damaged drill pipe (Lang et al., 2011). Nevertheless, such instabilities are useful for informing on stress directions and magnitudes (Haimson and Song, 1993). Borehole logging has been long used to estimate stress directions, based on the location of the breakouts around the well (Brudy et al., 1997; Zoback et al, 2003; Kingdon et al., 2016). In addition, several studies have suggested that the characteristics and dimensions of the breakouts, if properly measured, can also inform on the magnitudes of far-field stresses.
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Baud, P., C. Cheung, Y. Ji, and T. Wong. "Microstructural Control of Nucleation and Development of Compaction Bands in Porous Sandstone." In 75th EAGE Conference and Exhibition incorporating SPE EUROPEC 2013. Netherlands: EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20130559.

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Verhaegen, M., J. L. Brebner, and J. Albert. "Large refractive index changes observed in silicon implanted silica exposed to high cumulative doses of ArF laser light." In Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/bgppf.1997.jma.7.

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Used extensively in optical fibers technology, the change in refractive index produced by ultraviolet light in photosenstive silicate glasses is still not fully understood. Ion implantation is the only technique able to make photosensitive pure silica waveguides by the introduction of bleachable color centers and compaction of the matrix. After 100 pulses of 100mJ/cm2 of ArF bleaching, changes in the refractive index were found to be in good quantitative agreement with the changes in absorption of the bands induced by implantation between 5 and 8 eV. Index of refraction and absorption measurements of higher cumulative doses of ArF laser light as well as a Kramers-Kronig analysis are reported.
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Taunay, T., T. E. Tsai, E. J. Friebele, P. Niay, and J. F. Bayon. "Growth Kinetics Of Photoinduced Gratings And Paramagnetic Centers In High NA, Heavily Ge-Doped Silica Optical Fibers." In Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/bgppf.1997.jmf.6.

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The achievement of UV photoinduced refractive index changes in germanosilicate fibers paved the way for the development of fiber Bragg grating (FBG) based optical devices (e.g., filters, fiber lasers, sensors). Although the mechanisms underlying the UV photosensitivity are not fully understood, it is now well established that the refractive index changes are associated with a partial bleaching of an absorption band around 5 eV, arising from the Germanium Oxygen Defect Center (GODC). Several mechanisms have been proposed to explain the photosensitivity in germanosilicate fibers: color centers [1], stress relief [2] and compaction [3]. Depending on the Ge concentration and the experimental conditions used to write the gratings, three types of photosensitivity, type 1, type IIa and type 2 have been identified in unloaded Ge-doped silica fibers. The most commonly observed, type 1, arises in standard fibers ([GeO2] < 20 mol%) under either pulsed or cw UV exposure in the low fluence regime. Type 1 photosensitivity is characterized by a monotonie increase of both the mean refractive index <Δneff> and the induced refractive index modulation Δnmod under UV exposure. Unlike type 1, the most relevant feature of type IIa photosensitivity ([GeO2] > 25 mol%, ϕc ≈ 2µm) is the complex behavior of <Δneff> and Δnmod as a function of exposure time [4]. Indeed, with increasing UV exposure time, a partial or total bleaching of the saturated type I grating is followed by the formation of a new grating spectrum. At the time of the second grating growth, the shift experienced by the Bragg grating wavelength is nulled or slightly negative, indicating a negative refractive index change. Moreover, a noticeable difference between type 1 and type IIa photosensitivities is their markedly different thermal behavior. Type 1 gratings begin to anneal at temperatures as low as 300 C and are no longer observed at 550 C while type IIa gratings experience no annealing at temperatures below 450-500 C; a rapid decay is then observed at annealing temperatures ~600-700 C. Recent experiments have shown that the formation dynamics of type 1/IIa grating spectra are strongly affected when the gratings are written in strained fibers [5]. Using the “Photoelastic densification” model and stress dependence kinetics, it has been demonstrated that, under the assumption of a decrease in densification rate, stretching the fiber will in turn decrease the type 1 index modulation [3], [6]. Nevertheless the origin of type IIa photosensitivity in high NA Ge-doped silica fibers still remains unresolved.
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Oka, Fusao, and Sayuri Kimoto. "An Elasto-Viscoplastic Model for Clay Considering Destructuralization and Prediction of Compaction Bands." In First Japan-U.S. Workshop on Testing, Modeling, and Simulation. Reston, VA: American Society of Civil Engineers, 2005. http://dx.doi.org/10.1061/40797(172)3.

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Keehm, Youngseuk, Kurt Sternlof, and Tapan Mukerji. "Flow properties of compaction bands in sandstone: Permeability estimation using computational rock physics method." In SEG Technical Program Expanded Abstracts 2006. Society of Exploration Geophysicists, 2006. http://dx.doi.org/10.1190/1.2369886.

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