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Dissertations / Theses on the topic 'Clay modelling'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

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1

Kite, Matthew J. S. "Computational modelling of clay pipe extrusion." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources. Online version available for University members only until June 9, 2014, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=25966.

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2

Evans, D. G. "Modelling a china clay band dryer." Thesis, University of Exeter, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383097.

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3

De, Moor E. K. "Modelling of deep tunnel behaviour in clay." Thesis, City University London, 1989. http://openaccess.city.ac.uk/7396/.

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Several aspects of the ground response to tunnel excavation in deep clay formations have been studied. Such strata may be only lightly overconsolidated and an unsupported tunnel could have a high stability ratio. Consequently, at large depths there may be construcz ion difficulties similar to those encountered in soft ground at shallow depths. Problems which may be encountered are squeezing ground, i.e. a continually increasing volume loss with time, and possible collapse after a 'stand-up' time. A range of parameters likely to influence the time dependent deformation behaviour at an unsupport

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4

Ellison, Kirk Carr. "Constitutive modelling of a heavily overconsolidated clay." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610606.

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5

Wang, Yan. "Exploring Biopolymer-Clay Nanocomposite Materials by Molecular Modelling." Doctoral thesis, KTH, Teoretisk kemi och biologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166299.

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In this thesis, bio-nanocomposites made from two alternative biopolymers and montmorillonite (Mnt) clay have been investigated by molecular modelling. These biopolymers are xyloglucan (XG) and chitosan (CHS), both of which are abundant, renewable, and cost-effective. After being reinforced by Mnt clay nanoparticles, the polymer nanocomposites gains in multifunctionality and in the possibility to register unique combinations of properties, like mechanical, biodegradable, electrical, thermal and gas barrier properties. I apply molecular dynamics (MD) simulations to study the interfacial mechanis

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6

Grace, Tim, and n/a. "An investigation of primary school children's clay modelling techniques." University of Canberra. Education, 1993. http://erl.canberra.edu.au./public/adt-AUC20060712.130505.

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Children in their final years of primary schooling tend to emphasize the use of detail and the production of naturalistic representations, when modelling the human figure with clay. Children of this age rarely construct clay figures which are noted for their dynamic quality in terms of finish, proportion, or pose. This study examined the effect of using a "formative" modelling technique on the clay models made by 11 year old children. Involved in the study were two groups of 11 year old children. Both groups of children undertook a pre-test, a post-test, and a series of clay modelling activiti

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7

Morris, Jonathan David. "Physical and numerical modelling of grouted nails in clay." Thesis, University of Oxford, 1999. http://ora.ox.ac.uk/objects/uuid:530eeb78-5ead-4459-8733-3e6ae722c687.

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The research described in this thesis focussed on the bond resistance of grouted soil nails in clay. Physical modelling took the form of large scale element tests in the laboratory of drilled and grouted nails in a stiff clay. Nails were installed under different boundary stresses; testing was conducted at different constant rates of pull-out and also under sustained load conditions. Observed behaviour was compared with that predicted by measurements of interface shear resistance obtained in a conventional shear box. Numerical modelling was carried out in an attempt to improve understanding of

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8

Nigussie, Daniel Gebremedhin. "Numerical modelling of run-out of sensitive clay slide debris." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for bygg, anlegg og transport, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-23329.

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Flow slides in sensitive clay deposits are common phenomena in Scandinavia and Canada. These flow slides have caused catastrophes to infrastructure and human life. The post-failure movements of such flow slides usually are characterized by their retrogression distances and or by the run-out distance of the slide debris. There are empirical and numerical methods used to assess the retrogression distance of slide debris. On contrary, convincing and accurate modeling techniques for run-out of sensitive clay slide debris, which is a very complex and challenging process, is yet to be developed Ke

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9

Mrayed, Sabri Mohamed Ali Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Molecular modelling applications in crystallization fouling and clay/polymer nanocomposites." Awarded by:University of New South Wales. Chemical Sciences & Engineering, 2007. http://handle.unsw.edu.au/1959.4/40682.

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The present work used ab initio density functional theory (DFT) to study two different physical phenomena crystallization fouling and clay-based polymer nanocomposites. In the first part, two foulant materials were studied including calcium carbonate, and calcium sulfate. The lattice energy and enthalpy of formations of each crystal system were predicted using DFT methods. The most stable forms of calcium carbonate foul ant, calcite and aragonite, were investigated. For calcium sulfate, both gypsum and anhydrite crystals were investigated. The thermodynamic solubility product of each crystal s

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10

Lee, Yat Sun. "Physical and numerical modelling of pipe-soil interaction in clay." Thesis, University of Sheffield, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577564.

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To relieve the axial stress induce rature high-pressure pipelines in deepwater, current design methods leave the pipe unburied and allow the formation of the lateral buckles along the pipeline in a controlled manner. However, this approach requires a better understanding of the interaction between the seabed soil and the partially embedded pipeline under both vertical and lateral movements. Research has been carried out to examine the two soil-pipe interaction mechanisms, vertical pipe penetration and lateral pipe movement, involved in the installation and operation of an on-bottom offshore pi

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11

Gonzalez‐Blanco, Laura. "Gas migration in deep argillaceous formations : Boom clay and indurated clays." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/406355.

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Deep geological disposal remains the preferred option at present for the management of long-living and heat-emitting radioactive waste, which consists of confining the waste during a very long period (several hundreds of thousands of years) by placing them in a deep geological formation. Therefore, the understanding of the long-term behaviour of formations is becoming a key issue to ensure the feasibility of the geological disposal facilities, particularly regarding the generation and migration of gases. The present PhD work aims at better understanding the complex hydro-mechanical response o

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12

Dasari, Ganeswara Rao. "Modelling the variation of soil stiffness during sequential construction." Thesis, University of Cambridge, 1996. https://www.repository.cam.ac.uk/handle/1810/272773.

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13

Malikiossis, Ariane A. A. "Experiences through clay, therapeutic modelling and ceramics in two anthroposophic communities." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ43628.pdf.

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14

Sandström, Malin. "Numerical Modelling and Sensitivity Analysis of Tunnel Deformations in London Clay." Thesis, KTH, Jord- och bergmekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191257.

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In dense cities, the interactions between all structures, from tall skyscrapers to complex underground tunnel systems, need to be carefully analysed as soon as a new project is considered. This is necessary because of the stress changes in the soil induced by each new construction. Demolishing a building could cause heave at the base of the excavation, deflections in supporting structures and settlements of the surroundings. The behaviour can be modelled in order to predict how large the deformations will be. This thesis investigates the effectiveness of such models. This is done through the a

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15

Summersgill, Freya. "Numerical modelling of stiff clay cut slopes with nonlocal strain regularisation." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/34567.

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The aim of this project is to investigate the stability of cut slopes in stiff clay. The findings are subsequently applied to model stabilisation with piles, used to remediate failure of existing slopes and stabilise potentially unstable slopes created by widening transport corridors. Stiff clay is a strain softening material, meaning that soil strength reduces as the material is strained, for example in the formation of a slip surface. In an excavated slope this can lead to a progressive, brittle slope failure. Simulation of strain softening behaviour is therefore an important aspect to model

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16

Iskander, K. F. "A new approach in modelling undrained clay behaviour during pressuremeter test." Doctoral thesis, Universite Libre de Bruxelles, 1999. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211850.

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17

Bachmaf, Samer. "Uranium sorption on clay minerals." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2010. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-62404.

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The objective of the work described in this thesis was to understand sorption reactions of uranium occurring at the water-clay mineral interfaces in the presence and absence of arsenic and other inorganic ligands. Uranium(VI) removal by clay minerals is influenced by a large number of factors including: type of clay mineral, pH, ionic strength, partial pressure of CO2, load of the sorbent, total amount of U present, and the presence of arsenate and other inorganic ligands such as sulfate, carbonate, and phosphate. Both sulfate and carbonate reduced uranium sorption onto IBECO bentonite due to

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18

Mwamila, Luhuvilo. "Arsenic (V) and Phosphate sorption to Swedish clay soils - Freundlich sorption modelling." Thesis, KTH, Miljögeokemi och ekoteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96100.

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This thesis is an attempt to analyze and interpret the behavior of the two elements arsenic and phosphorus when released into the environment. Both of them may occur naturally in the environment but also may be added to the environment for certain purposes e.g. as pesticides and fertilizers respectively or through anthropogenic sources. When in excess, arsenic can be toxic to plants and organisms in the soil and some of it when leaches to groundwater or transported to surface water bodies through runoffs may pose a threat to aquatic organisms. Likewise, phosphorus when in excess result into eu

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19

Lee, Nang Lap. "Analytical, centrifuge and numerical modelling of underwater vacuum consolidation of soft clay /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20LEEN.

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20

Breen, L. "Re-modelling clay : ceramic practice and the museum in Britain (1970-2014)." Thesis, University of Westminster, 2016. https://westminsterresearch.westminster.ac.uk/item/9x230/re-modelling-clay-ceramic-practice-and-the-museum-in-britain-1970-2014.

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This thesis analyses how the dialogue between ceramic practice and museum practice has contributed to the discourse on ceramics. Taking Mieke Bal’s theory of exposition as a starting point, it explores how ‘gestures of showing’ have been used to frame art‑oriented ceramic practice. Examining the gaps between the statements these gestures have made about and through ceramics, and the objects they seek to expose, it challenges the idea that ceramics as a category of artistic practice has ‘expanded.’ Instead, it forwards the idea that ceramics is an integrative practice, through which practitione

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21

Muleya, Franco. "Modelling wheeled construction plant performance in clay and sandy terrain : a terramechanics perspective." Thesis, Anglia Ruskin University, 2014. http://arro.anglia.ac.uk/550362/.

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This research has investigated the effect of tyre rutting of wheeled construction plant performance traversing in wet and deformable terrain, specifically clay and sand. The purpose was to translate the wheel rutting into performance reduction measured in drawbar-pull. The ultimate goal was to translate the power loss into practical effects on cost, time and other economic variations on construction projects that are characterised by movement of wheeled plant on long haulage deformable roads. In order to achieve this aim, mathematical modelling was deployed based on Newton’s laws of motion, pr

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22

Montalti, Luca. "Heave of large excavations in clay: modelling and analysis of two british case-histories." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/1166/.

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ABSTRACT Il presente lavoro vuole introdurre la problematica del rigonfiamento del terreno a seguito di grandi scavi in argilla. Il sollevamento del terreno dopo lo scavo può passare inosservato ma sono numerosi i casi in cui il rigonfiamento dura per molti anni e addirittura decenni, Shell Centre, London, Lion Yard, Cambridge, Bell Common, London, ecc. Questo rigonfiamento il più delle volte è impedito dalla presenza di fondazioni, si genera quindi una pressione distribuita che se non considerata in fase di progetto può portare alla fessurazione della fondazione stessa. L’anima del pr

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23

Jones, Brendon Ronald. "Geotechnical centrifuge modelling of the behaviour of a compressible clay horizon underlying a reinforced sand foundation." Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/40363.

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Basal reinforcement, where high tensile geogrids are employed beneath structures, is becoming an increasingly accepted construction technique along the eastern coast of southern Africa. The presence of compressible, soft, thin and shallow clay horizons usually associated with complex estuarine or lagoonal deposits are a major consideration when using basal reinforcement as a founding technique. Basal reinforcement involves the use of high tensile strength geogrids beneath a structure to form a reinforced sand foundation. Deformation behaviour under loading is an important component of st

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24

Marx, David Hercules. "The optimal placement of geogrid reinforcement in landfill clay liners." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/60633.

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Continued population growth is placing strain on the waste disposal facilities available in South Africa. However, limited air space suitable for landfilling drives the need for alternative solutions such as piggyback landfills to expand the waste disposal capacity. This method entails building a new, fully lined, landfill on top of existing waste. However, the old underlying waste is prone settlement that can result in the cracking of new landfill clay liner. Geogrid reinforcement have been successfully used in clay liners to mitigate cracking induced by waste settlement. This researc

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25

Postill, Harry E. "Weather-driven clay cut slope behaviour in a changing climate." Thesis, Loughborough University, 2018. https://dspace.lboro.ac.uk/2134/35832.

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Long linear earthwork assets constructed in high-plasticity overconsolidated clay are known to be deteriorating due to long-term effects of wetting and drying stress cycles as a result of seasonal weather patterns. These stress cycles can lead to shallow first-time failures due to the mobilisation of post-peak strength and progressive failure. Design requirements of new earthworks and management of existing assets requires improved understanding of this critical mechanism; seasonal ratcheting. Incremental model development and validation to allow investigation of multiple inter-related strengt

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26

Hu, Wei. "Physical modelling of group behaviour of stone column foundations." Thesis, Connect to e-thesis, 1995. http://theses.gla.ac.uk/817/.

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Thesis (Ph.D.) - University of Glasgow, 1995.<br>Ph.D. thesis submitted to the Faculty of Engineering, Department of Civil Engineering, Unversity of Glasgow, 1995. Includes bibliographical references. Print version also available.

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27

Poorooshasb, Farrokh. "Centrifuge modelling of the dynamic embedment of a heat emitting projectile in normally consolidated clay." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254435.

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28

Rujikiatkamjorn, Cholachat. "Analytical and numerical modelling of soft clay foundation improvement via prefabricated vertical drains and vacuum preloading /." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060523.123914/index.html.

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29

Salman, Marwan A. [Verfasser], and Siegfried [Akademischer Betreuer] Schmauder. "Multiscale modelling of nano-clay filled shape memory polymer foams / Marwan A. Salman ; Betreuer: Siegfried Schmauder." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2020. http://d-nb.info/120659053X/34.

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30

Brennan, Colin. "River Analysis and Climate Change: Continuous Prediction of Clay-Bed Erosion in Watts Creek." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/37042.

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Predicted future precipitation is downscaled and used to drive a hydrologic model to assess future erosion potential in a semi-alluvial clay-bed watercourse, Watts Creek. The 21 km2 watershed is predominantly urban, with overall impervious cover of 22%, and the remaining land use split between agricultural and forested areas. Continuous simulations for the open water year, excluding spring freshet (April 1st to October 31st) were performed using the SWMHYMO (Stormwater Management Hydrologic Model) lumped hydrologic modelling platform. A shear stress exceedance and stream power erosion routine

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31

Martin, Christopher Michael. "Physical and numerical modelling of offshore foundations under combined loads." Thesis, University of Oxford, 1994. http://ora.ox.ac.uk/objects/uuid:b582fb74-7a1b-4be9-884d-0daa9fda7c7b.

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In addition to vertical loads, the foundations of offshore structures are subjected to horizontal loads and overturning moments as a result of environmental (wind and wave) loading. The behaviour of circular footings on cohesive soil under conditions of combined vertical, horizontal and moment (V, H, M) loading is the primary concern of this thesis. A programme of physical model tests, involving combined loading of circular footings on reconstituted Speswhite kaolin, is reported. The shape of footing used is typical of the "spudcan" foundations of independent leg jack-up drilling platforms. Pr

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32

Lee, Kok Kuen. "Investigation of potential spudcan punch-through failure on sand overlying clay soils." University of Western Australia. School of Civil and Resource Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0212.

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When a jack-up foundation is installed on seabeds consisting of a sand layer overlying soft clay, potential for 'punch-through' failure exists. This happens due to an abrupt reduction in bearing resistance when the foundation punches a block of sand into the underlying soft clay in an uncontrolled manner. This can lead to a sudden large penetration that can cause temporary decommissioning and even toppling of the unit. This research has addressed this problem with the aim of developing a practical design method for the jack-up industry to assess potential punch-through hazards. This objective

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33

Xu, Longfei. "Mechanical behaviour of compacted earth with respect to relative humidity and clay content : experimental study and constitutive modelling." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSET005/document.

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La terre compactée est considérée comme un mélange granulaire dans lequel l'argile joue un rôle de liant mais cette dernière exhibe une forte interaction avec l'eau. Pendant la durée de vie en service, la terre compactée est soumise aux changements de l’humidité relative. En raison de ces changements des conditions ambiantes perpétuels, la teneur en eau dans la terre varie, impactant leur performance mécanique. Le présent travail a ainsi pour but d’étudier l’impact de l’humidité relative et de la teneur d'argile sur le comportement mécanique de la terre compactée. Il se réalisera au travers d’

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34

Hermansson, Linnea, and Rebecka Söderberg. "Modelling of a compensated foundation in GeoSuite Settlement." Thesis, KTH, Jord- och bergmekanik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-278541.

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The world today is constantly growing, creating a need of new roads and residential areas. New constructions lead to an increased load onto the soil, which can result in deformations when the soil layers underneath are compressed. To reduce the increased load on the soil, a compensated foundation can be used. This method is based on the principle that the load from the construction will be compensated by the excavated soil, often replaced by a lightweight material. As an example, this method can be used in areas with great clay layers and in sensitive projects where the rise of deformations ca

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35

Lei, Xiaoqin. "Theoretical modelling of coupled chemo-hydro-mechanical behaviour of unsaturated expansive clays." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0074.

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Expansive clays used in engineering practice are usually unsaturated and are sensitive to chemical composition of the in-pore solution. To analyse the complex coupled problems involved, an efficient mathematical model which can account for these chemo-hydro-mechanical behaviours has been developed. In this thesis, expansive clays are conceptualised into three-phase multi-species porous media. Based on the modified mixture theory and irreversible thermodynamics, a thermo-electro-chemo-hydro-mechanical framework has been developed. The Clausius-Duhem inequality, which governs the dissipations as

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36

Manivannan, Ganeshalingam Aerospace Civil &amp Mechanical Engineering Australian Defence Force Academy UNSW. "Viscoplastic modelling of embankments on soft soils." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Aerospace, Civil and Mechanical Engineering, 2005. http://handle.unsw.edu.au/1959.4/38743.

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A major instrumented geosynthetic reinforced approach embankment was constructed to 5.5 m elevation above ground, with prefabricated vertical drains, over a soft compressible clay deposit at Leneghan, Newcastle, Australia in May 1995. The field monitoring of settlements for over six years shows that the embankment manifests significant creep. The instrumentation, field performance and the finite element analyses for predicting the long-term performance of this embankment are described in this thesis. The maximum settlement of 1.1 m was observed one year after the completion of construction. H

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Ahayan, Sanae. "A constitutive Model for natural Clays : From Laboratory Testing to Modelling of Offshore Monopiles." Thesis, Ecole centrale de Nantes, 2019. http://www.theses.fr/2019ECDN0027.

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La contribution des parcs éoliens offshore en termes d’énergie renouvelable ne cesse de croître. L’électricité produite notamment par les éoliennes en mer du Nord représente de ce fait une part importante de l’énergie consommée en Europe. Pourtant, les objectifs de la Commission Européenne en termes de transition énergétique à l’horizon de 2020 sont loin d’être réalisés sans l’optimisation des techniques existantes et le développement de technologies de plus en plus innovantes. Les monopieux sont les fondations les plus populaires dans l’industrie des éoliennes offshores. Ce sont des pieux lar

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38

Larsson, Martin. "Quantifying macropore flow effects on nitrate and pesticide leaching in a structured clay soil : field experiments and modelling with the MACRO and SOILN models /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5489-1.pdf.

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Baxter, David. "Innovation in the design of continuous flight auger and bored displacement piles." Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/5091.

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The field of pile design and construction in the United Kingdom is currently in a period of change. Not only are new processes and techniques being developed but also the legislative landscape is changing with the introduction of new Europe wide normative standards (BSI, 2004, 2007). This project sought to optimise pile design through better understanding and interpretation of ground conditions and of the pile-soil interaction for two pile types, continuous flight auger and bored displacement piles. Quantitative methods for interpreting and summarising previous knowledge and experience have be

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40

Xu, Wenjie. "Investigation of Gas Migration in saturated Argillaceous Rock." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-132511.

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Gas migration in saturated argillaceous rock is studied in this work. Dependent on the pressure level the gas transport process is controlled by different mechanisms. Gas injection tests have been carried to investigate the gas transport process in low permeable argillaceous rock. We focus on the Opalinus Clay, which has been widely researched and is important for searching possible host rock of the radioactive waste disposal. Gas injection tests at different scales (laboratory, in-situ borehole and in-situ tunnel test) are intensively investigated in this work. The measurements of the tests a

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Sane, Abdoul Razac. "Matériaux à base de phosphates pour le stockage thermique de l'énergie." Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2017. http://www.theses.fr/2017EMAC0010.

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Le stockage d’énergie joue un rôle très important dans le secteur énergétique. Concernant le stockage thermique, il est indispensable pour le fonctionnement en continue des centrales solaires à concentration (CSP) ou pour la récupération des chaleurs perdues dans des installations industrielles. Il y a de nos jours un besoin urgent de nouveaux matériaux performants pour remplacer les matériaux conventionnels à base de nitrate pour un fonctionnement à haute température. La présente thèse porte sur le développement de nouveaux matériaux à base de phosphates pour le stockage de la chaleur sensibl

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42

Nguyen, Thê Duong. "Étude du comportement au feu des maçonneries de briques en terre-cuite : approche expérimentale et modélisation du risque d'écaillage." Thesis, Paris Est, 2009. http://www.theses.fr/2009PEST1059/document.

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La compréhension du comportement des structures en maçonneries exposées au feu et la prédiction de leur résistance au feu, sont des besoins majeurs, exprimes par les industriels de la terre cuite, à cause du manque d’études disponibles. L’objectif de ce travail est de construire des outils numériques qui sont capables de prédire le comportement et la tenue au feu des murs de briques alvéolaires en terre cuite, porteurs ou non porteurs, montes avec joints épais en mortier traditionnel ou avec joints minces en mortier colle. Pour cela, des investigations expérimentales à l’échelle de matériau et

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43

Baudet, Beatrice Anne. "Modelling effects of structure in soft natural clays." Thesis, City University London, 2001. http://openaccess.city.ac.uk/8394/.

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Geological processes give natural clays a different structure to that of clays that are reconstituted in the laboratory. In soft clays, this structure often breaks down under loading; this is called destructuration. This project aimed to develop a model to predict destructuration in soft natural clays. An understanding of the main characteristics of the behaviour of these clays detained was from data reported in the literature. Existing frameworks that describe the behaviour of these clays were reviewed, and basic concepts proposed to model structured soils. The Sensitivity framework (Cotecchi

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44

Jagercikova, Marianna. "Kinetic quantification of vertical solid matter transfers in soils by a multi-isotopic approach." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4307/document.

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Le lessivage du lutum (0-2 µm) est un de processus majeurs de la pédogenèse, qui a néanmoins été peu quantifié et modélisé. Ce processus ainsi que la bioturbation ont été quantifiés ici en couplant des différents systèmes isotopiques (137Cs, 210Pb (xs), 10Be atmosphérique, 206/207Pb, δ13C, 14C) à une modélisation numérique par une équation de diffusion-convection à paramètres variables avec la profondeur. Cette méthode originale a été appliquée sur des anthroposéquences de Luvisols développées sur du loess et différantes de par leur utilisation (culture, prairie ou forêt) et leurs pratiques ag

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Freitas, Teresa Maria Bodas. "Numerical modelling of the time dependent behaviour of clays." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/8370.

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In the last two decades extensive research has been undertaken to characterize the time and rate dependent response of soils and to describe it by means of a constitutive model. However, most of these constitutive equations have been dev.eloped for a single stress point and limited stress paths, and in engineering practice the time, dependent nature of soils is still commonly reduced to a single coefficient of secondary consolidation obtained from a 24h oedometer test. J This thesis describes the development and implementation, in the Imperial College Finite Element Program (I~FEP), of two ela

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Ruiz, Restrepo Daniel Felipe. "Hydro-mechanical analysis of expansive clays : constitutive and numerical modelling." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/669205.

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Bentonite-based materials are being currently considered in several countries as a backfill component in the multi-barrier concept for deep geological disposal of radioactive waste. The bentonite barrier fulfils several important functions: i) high swelling capacity to fill gaps and compress the excavation damaged zone and ii) very low hydraulic conductivity and important retention capacity which retards significantly radionuclides transport. Small-scale testing in geotechnical laboratories and in-situ experiments in underground research laboratories (URL) have demonstrated that initial state,

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Sellers, E. J. "Constitutive modelling of the behaviour of clays under cyclic loading." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/8317.

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Includes bibliography.<br>This research work involved the implementation of a constitutive model based on plasticity theory to model the behaviour of a clay under cyclic loading. The modelling must be based on an understanding of the soil response and the critical state theory provides a description of the soil response which then be formulated in terms of plasticity theory. A literature review showed that there is a shortage of information on the behaviour of soils under cyclic loading. Constitutive models for 'cyclic loading are discussed to compare the predictions and thus select a model.

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Phillips, John Wilfrid. "Mathematical and physical modelling of a floating clam-type wave energy converter." Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/8641.

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The original aim of the research project was to investigate the mechanism of power capture from sea waves and to optimise the performance of a vee-shaped floating Wave Energy Converter, the Floating Clam, patented by Francis Farley. His patent was based on the use of a pressurised bag (or ‘reservoir’) to hold the hinged Clam sides apart, so that, as they moved under the action of sea waves, air would be pumped into and out of a further air reservoir via a turbine/generator set, in order to extract power from the system. Such “Clam Action” would result in the lengthening of the resonant period

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Chen, Pingan Carleton University Dissertation Engineering Civil and Environmental. "Modelling the effects of lime-fly ash columns installed in soft clays." Ottawa, 1995.

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Bernard, Ellina. "Magnesium silicate hydrate (M-S-H) characterization : temperature, calcium, aluminium and alkali." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCK025/document.

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Les différentes options envisagées par la France et la Suisse pour le stockage de déchets radioactifs en couches géologiques profondes argileuses prévoient l’utilisation d’importants volumes de matériaux cimentaires. Les liants dits bas-pH ont été développés afin de limiter la perturbation de la roche encaissante par le panache alcalin. Les études expérimentales menées sur les interfaces béton bas-pH-argile mettent systématiquement en évidence la formation de phases silico-magnésiennes, potentiellement de silicate de magnésium hydraté (M-S-H), mal modélisées à cause de données thermodynamiques

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