Dissertations / Theses on the topic 'Triaxial stress'
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Walsh, Thomas George. "The triaxial vane apparatus with stress control." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/6305.
Full textAmbrose, Jasmin. "Failure of anisotropic shales under triaxial stress conditions." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/19270.
Full textYounessi, Sinaki Ahmad Reza. "Sand production simulation under true-triaxial stress conditions." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/1133.
Full textMillar, Michael James. "The stress-strain behaviour of jointed chalk." Thesis, University of Brighton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324397.
Full textKhatrush, Suleiman Ali. "The yielding of a fine sand in triaxial stress space." Thesis, University of Surrey, 1987. http://epubs.surrey.ac.uk/841582/.
Full textOvando, Shelley Efrain. "Stress-strain behaviour of granular soils tested in the triaxial cell." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/7891.
Full textMenozzi, Jerald Paul. "Microcomputer-based controller of coupled fluid pressures in triaxial stress testing." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/104016.
Full textMICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING
Bibliography: leaf 42.
by Jerald Paul Menozzi Jr.
B.S.
Salman, Talib H. "Triaxial behaviour of partially saturated granular soils at low stress levels." Thesis, University of Sheffield, 1995. http://etheses.whiterose.ac.uk/10232/.
Full textAl-Harthy, Said Salim. "Laboratory investigation of petrophysical properties of sandstone rocks under true triaxial stress." Thesis, Imperial College London, 1999. http://hdl.handle.net/10044/1/8549.
Full textZissopoulos, Pantelis. "Shortcrete under triaxial stress conditions : material properties and their use in structural analysis." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/11380.
Full textHoyos, Laureano R. Jr. "Experimental and computational modeling of unsaturated soil behavior under true triaxial stress states." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/32773.
Full textDweirj, Mohammad Kh. "A study of stress dependent stiffness of rock using the multistage triaxial test." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434084.
Full textALEIXO, MARCONI SOARES. "STRESS - STRAIN BEHAVIOR OF A GNEISS RESIDUAL SOIL USING THE CUBIC TRIAXIAL CELL." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1998. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1526@1.
Full textO conhecimento do comportamento de solos residuais é de grande importância para projetos geotécnicos no Brasil e, em particular, na região do Rio de Janeiro, tendo em vista que o clima tropical e as características geológicas favorecem a ocorrência de mantos residuais de grande espessura. O presente trabalho trata do estudo do comportamento tensão-deformação de um solo residual proveniente de um perfil de alteração de rocha gnáissica do maciço da Tijuca, Rio de Janeiro. Como os solos residuais gnáissicos preservam as foliações herdadas da rocha matriz, investigou-se em particular a relevância de se considerar a ocorrência de anisotropia nas características de resistência e deformabilidade destes solos. No estudo foi utilizado o equipamento triaxial cúbico desenvolvido na PUC-Rio. Este equipamento possibilita o controle independente das três tensões principais, sendo mais adequado para a reprodução das trajetórias de tensões tridimensionais, usualmente associadas com obras geotécnicas no campo, e em particular, para estudos sobre as características de anisotropia de solos. O programa experimental constou de ensaios de compressão axial e hidrostática, sob condições drenadas de carregamento, utilizando o equipamento triaxial cúbico. Foram realizados também ensaios oedométricos convencionais, de modo a se obter as características de compressibilidade do solo. Foram moldados corpos de prova a partir de blocos indeformados, paralelos e perpendiculares à foliação observada no solo, o que possibilitou a análise dos resultados para direções distintas de carregamento. Para efeito de comparação sobre a relevância do arranjo estrutural dos grãos do solo, foram ensaiados também corpos de prova compactados dos mesmos materiais. A análise dos resultados permitiu a obtenção dos módulos de deformabilidade e dos parâmetros de resistência do solo residual. Em particular, foram verificados os efeitos da direção de carregamento dos corpos de prova, do nível das tensões de confinamento, do grau de intemperismo, do arranjo estrutural dos grãos e dos efeitos do grau de saturação. Pode-se concluir que os solos estudados não apresentaram efeitos marcantes de anisotropia nas características de resistência. No entanto, quanto à deformabilidade, pode-se considerar que o solo residual jovem apresentou características anisotrópicas.
The knowledge of the mechanical behaviour of residual soils is of great importance in geotechnical projects, because of its abundance in tropical regions, such as Brazil and particularly in the area of Rio de Janeiro. The present work presents a study on the fundamental stress-strain behaviour of a residual soil resulting from a profile of a gneiss rock in Rio de Janeiro. As the gneiss residual soils preservethe bedding planes from the parent rock, the relevance of considering anisotropy in the stress- strain characteristics of these soils was investigated. The cubic triaxial equipment developed at PUC-Rio was used in this research. This equipment allows the independent control of the three principal stresses, allowing the reprodution of three-dimensional stress paths, usually associated with geotechnical works in the field. The experimental program consisted of axial and hidrostatic tests, under drained loading conditions, using the cubic triaxial equipment. One- dimensional oedometer tests were also performed, in order to obtain the compressibility characteristics of the residual soil. Undisturbed specimens were prepared with the bedding planes parallel or perpendicular to the loading direction. Analysis of the test results showed the effects of load direction, confining stress level, weathering degree, structural soil fabric and saturation degree. It may be concluded that the gneiss residual soils which were selected for this research do not present significant effects of anisotropy in the strength characteristics. In the stress- strain characteristics, however, it may be concluded that the young residual soil showed effects of anisotropy.
EL conocimiento sobre el comportamiento de suelos residuales resulta de gran importancia para los proyectos geotécnicos en Brasil y, en particular, en la región de Rio de Janeiro, considerando que el clima tropical y las características geológicas favorecen la existencia de mantos residuales de gran espesor. El presente trabajo estudia el comportamiento tensión-deformación de un suelo residual proveniente de un perfil de alteración de roca gnáisica del macizo de la Tijuca, Rio de Janeiro. Como los suelos residuales gnáisicos preservan las foliaciones heredadas de la roca matriz, fue necesario estudiar si resultaba relevante considerar la aparición de anisotropía en las características de resistencia y deformabilidad de estos suelos. En el estudio se utilizó el equipo triaxial cúbico desarrollado en la PUC-Rio. Este equipo permite el control independente de las tres tensiones principales, siendo más adecuado para la reproducción de las trayectorias de tensiones tridimensionales, usualmente asociadas a obras geotécnicas en el campo, y en particular, para estudios sobre las características de anisotropía de suelos. El programa experimental incluyó ensayos de compresión axial e hidrostática, sobre condiciones drenadas de carga, utilizando el equipo triaxial cúbico. Fueron realizados también ensayos oedométricos convencionales, con el objetivo de obtener las características de compresibilidad del suelo. Fueron moldados cuerpos de prueba a partir de bloques no deformados, paralelos y perpendiculares a la foliación observada en el suelo, lo que permitió el análisis de los resultados para distintas direcciones de carga. Para efecto de comparación sobre la relevancia del arreglo extructural de los granos del suelo, se realizaron ensayos con cuerpos de prueba compactados de los mismos materiales. El análisis de los resultados permitió la obtención de los módulos de deformabilidad y de los parámetros de resistencia del suelo residual. En particular, se verificaron los efectos de la dirección de carga de los cuerpos de prueba, del nível de las tensiones de contensión, del grado de intemperización, de la disposición extructural de los granos y de los efectos del grado de saturación. Se puede concluir que los suelos estudiados no presentaran efectos marcantes de anisotropía en las características de resistencia. Sin embargo, con respecto a la deformabilidad, se puede considerar que el suelo residual joven presentó características anisotrópicas.
Pessoa, Josà Rafael DiÃgenes. "Development of a triaxial cell for estimating the horizontal in stress conditions edomÃtricas." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15990.
Full textEsta dissertaÃÃo apresenta o desenvolvimento de uma cÃlula triaxial e uma proposta de metodologia para estimativa de tensÃo horizontal em condiÃÃo edomÃtrica, atravÃs da realizaÃÃo de ensaios de laboratÃrio em amostras nÃo saturadas de solo compactadas na umidade Ãtima. O desenvolvimento da cÃlula triaxial possibilita a aplicaÃÃo de tensÃes ou deformaÃÃes controladas. AlÃm disso, o equipamento permite a aplicaÃÃo independente de incrementos de tensÃes axiais e radiais, facilitando dessa forma a execuÃÃo de ensaio triaxial sob qualquer caminho de tensÃes. A metodologia proposta simplifica a estimativa da tensÃo lateral atravÃs da comparaÃÃo das curvas tensÃo-deformaÃÃo axial entre o ensaio edomÃtrico convencional e ensaios de adensamento triaxiais sob diferentes caminhos de tensÃes com a relaÃÃo constante entre os incrementos axial e radial. Nesse caso, o valor de K0 seria o correspondente à trajetÃria constante na qual a curva do ensaio triaxial se sobrepÃe a curva do ensaio edomÃtrico em termos de tensÃes e deformaÃÃes axiais. Foram realizados ensaios com diferentes tipos de solo e os resultados mostraram-se aproximadamente concordantes com as estimativas realizadas a partir de correlaÃÃes empÃricas, permitindo dessa forma validar a proposta apresentada nessa pesquisa. TambÃm foi estudada a variaÃÃo da tensÃo horizontal durante o colapso por inundaÃÃo em condiÃÃes edomÃtricas. Nesses ensaios verificou-se que, durante o colapso, a tensÃo horizontal pode permanecer praticamente constante ou atà mesmo diminuir.
Raybould, Matthew James. "The response of silt-clay mixtures to cyclic loading." Thesis, University of Nottingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363244.
Full textLECH, RONALD SCOTT. "DETERMINATION OF CONSOLIDATED-DRAINED SHEAR STRENGTH OF UNDISTURBED LAKEBED CLAYS FROM CONSOLIDATED-UNDRAINED TRIAXIAL TESTS." University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin973284326.
Full textAl-Ajmi, Adel. "Wellbore stability analysis based on a new true-triaxial failure criterion." Doctoral thesis, Stockholm : Department of Land and Water Resources Engineering, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4037.
Full textSviridov, Viacheslav [Verfasser]. "Stress-Dependent Elastic Properties of Anisotropic Sedimentary Rocks: Uniaxial and Triaxial Experiments and Theoretical Modelling / Viacheslav Sviridov." Berlin : Freie Universität Berlin, 2019. http://d-nb.info/1176638718/34.
Full textMun, Byoung-Jae. "Unsaturated soil behavior under monotonic and cyclic stress states." Texas A&M University, 2004. http://hdl.handle.net/1969.1/1361.
Full textSheahan, Thomas C. (Thomas Clair). "An experimental study of the time-dependent undrained shear behavior of resedimented clay using automated stress path triaxial equipment." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13486.
Full textPenketh, S. "A study into the mapping of an induced fracture in a fine grained sediment in biaxial and triaxial stress formations." Thesis, University of Salford, 2018. http://usir.salford.ac.uk/48299/.
Full textTawana, Siyd S. "Behavior of plain and steel fiber reinforced concrete under multiaxial stress." Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1178903105.
Full textZhalehjoo, Negin. "Characterisation of the deformation behaviour of unbound granular materials using repeated load triaxial testing." Thesis, Federation University of Australia, 2018. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/166953.
Full textDoctor of Philosophy
Salleh, Sharuddin bin Md. "Cyclic loading of carbonate sand : the behaviour of carbonate and silica sands under monotonic and various types of cyclic triaxial loading of isotropically consolidated undrained samples." Thesis, University of Bradford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338750.
Full textZhang, Xuesong, and n/a. "Punching Shear Failure Analysis of Reinforced Concrete Flat Plates Using Simplified Ust Failure Criterion." Griffith University. School of Engineering, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20051104.153239.
Full textZhang, Xuesong. "Punching Shear Failure Analysis of Reinforced Concrete Flat Plates Using Simplified Ust Failure Criterion." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/365777.
Full textThesis (Masters)
Master of Philosophy (MPhil)
School of Engineering
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Wyman, Richard Durtschi. "Non-Schmid Effects and Criteria for Dislocation Nucleation on Different Slip Systems at Grain Boundaries." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6423.
Full textMarques, Sérgio Filipe Veloso. "Comportamento de uma areia artificialmente cimentada até altas tensões de confinamento." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/148695.
Full textThe search for new technical solutions to reduce construction time of engineering works and to make them more cost-effective has been object of the research lines of the group of Geotechnical Engineering of Federal University do Rio Grande do Sul. Numerous studies have been conducted to analyse and understand the behaviour of artificially cemented. Portland cement is widely used for improving strength and deformability characteristics of soils. To study the contribution of cementation under high pressures, a 10 MPa confining pressure triaxial apparatus was built to study the stress-strain-dilatancy behaviour of artificially cemented soils cured under stress. In parallel a study was conducted on a artificially cemented uniform sand at three curing times (3, 7 and 28 days) to determine the unconfined compressive strength (qu) and splitting tensile strength (qt) according to voids/cement ratio (η/Civ) dosage methodology. The results showed that strength increases with the reduction of voids/cement ratio (η/Civ) and with the increasing of cure time (t). The tensile/compression ratio (qt/qu) is independent of curing time and presents a mean value of 0.15. In addition to these results, other granular soils mixtures with distinct types of cement and different curing times were analysed. A unique normalized curve was fit to unconfined compressive strength (qu) and splitting tensile strength (qt) against voids/cement ratio (η/Civ). At the same time, the effect of the curing type (under stress or atmospheric) was verified through triaxial compression tests with mean effective stresses ranging from 250 kPa to 4000 kPa. In addition, the variation of η/Civ and cure time was evaluated for samples cured under stress. The results show that, in general, by increasing the mean effective stress, the type of cure does not affect the values of the maximum deviatoric stress. The frictional portion is predominant in the stress-strain behavior. The type of cure affects the yielding surface and the stiffness of the samples. It was observed the increase in this properties for samples cured under stress compared to samples cured with atmospheric stress. Based on the outcomes of this study, with satisfactory results, an elastoplastic model with stiffness degradation (using unconfined compressive strength (qu), friction angle (’) and an equivalent strain ( s0.7)) was proposed to simulate the stress-strain behaviour of artificially cemented sands in triaxial tests.
Kaya, Mustafa. "A Study On The Stress-strain Behavior Of Railroad Ballast Materials By Use Of Parallel Gradation Technique." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/3/12605026/index.pdf.
Full textwhereas that of only 35 kPa is used to characterize the accumulated plastic strain. The angle of internal friction, f, and the apparent cohesion, c, may be conservatively taken to be 42o and 35 kPa for all materials. The elastic moduli values for all materials may be predicted within an adequate estimate for the engineering purposes by using the power law parameters, K and n, determined for L-9.5 (D50 = 12.7 mm), the coarsest gradation tested for limestone. K with a reference pressure, pr = 1 kPa and n values for L-9.5, respectively, are 4365 and 0.636 for initial
8511 and 0.419 for secant
25704 and 0.430 for unloading-reloading elastic moduli. The unloading-reloading moduli increased, as the number of cycles increased. An increase in unloading-reloading modulus at N = 20 obtained was roughly 15% for scaled-down limestone
10% for the basalt
and 5% for the steel-slag. The plastic strain after first cycle, &
#949
1, and the plastic strain coefficient, C can be represented as a function of mean particle size for each material type. For the limestone, basalt and steel-slag prototype size, D50 = 45 mm, &
#949
1 values of 0.59, 0.43 and 0.75 and C values of 0.54, 1.42 and 0.74 are predicted, respectively.
Oravec, Heather Ann. "Understanding Mechanical Behavior of Lunar Soils for the Study of Vehicle Mobility." Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1233521118.
Full textZeissler, Alexander. "Untersuchungen zum spannungsabhängigen Materialverhalten von Asphalt." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-167970.
Full textCharacteristic material parameters especially for asphalt pavements are required due to the introduction of numerical pavement design methods. Furthermore, the continuous development of FEM programs, which are used for structural analysis and simulation calculations, also requires the knowledge of detailed material properties. It is state of the art that asphalt shows a significant temperature and frequency dependent behavior. The knowledge regarding additional impact parameters is very limited. This is especially valid for the stress dependency of the material parameters resulting from the stress state within the asphalt pavement based on the external loads. The main aim of this work was the investigation of the possible stress dependencies of the characteristic material parameters of asphalt. In this context, questions related to the anisotropic effects of the material behavior have also been taken up. Two asphalt surface layer materials, which have significant differences in the material composition and the granular structure were investigated in this context. On the one hand a stone mastic asphalt (SMA11S with PmB 25/55-55A) and on the other hand a porous asphalt (PA8 with PmB 40/100-65A) were included in the testing scheme. Uniaxial and triaxial tests were selected to determine the material behavior at the laboratory. Within the determination of the anisotropic material behavior of asphalt, it could be proven that the usually vertical compaction direction during the compaction process effects anisotropic material properties. This behavior can be determined independent from the particle shape, the used aggregate material and the specification of the asphalt mastic. Another essential result is, that asphalt materials show a significant stress dependent material behavior in a wide range of the performance temperature. Only on very low temperatures the material behavior of asphalt can be assumed to be linear elastic. The granular structure of asphalt material as well as the specification of the asphalt mastic and the thickness of the binder between the particles have a significant influence on the type and size of the characteristic material properties and the effect of stress dependency. Finally, it can be concluded, that it is essential to investigate the material behavior of each ingredient and their interaction within the asphalt structure to expand the knowledge regarding the fundamental material behavior of asphalt
Golightly, Christopher Robert. "Engineering properties of carbonate sands : the geological origins, classification, engineering, shear and triaxial stress path properties of four carbonate sands. The analysis of the transfer function for pile skin friction." Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285066.
Full textBobei, Doru Aerospace Civil & Mechanical Engineering Australian Defence Force Academy UNSW. "Static liquefaction of sand with a small amount of fines." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Aerospace, Civil and Mechanical Engineering, 2004. http://handle.unsw.edu.au/1959.4/38699.
Full textChampiré, Florian. "Étude expérimentale du comportement hydro-mécanique de la terre crue compactée pour la construction." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSET007/document.
Full textEarthen buildings can provide an answer to face difficulties in modern constructions in both terms of sociology, economics as well as ecology. However, the difficulty to understand and to predict their behavior prevent the spreading of this technique in developed countries. This PhD is part of a research program called “Primaterre” and founded by the French National Agency for Research. It aims at providing the necessary scientific knowledge to overcome this lack and at helping the creation of appropriate standards. This work is more precisely focusing on the impact of water on the mechanical behavior of the fine proportion of the material, including sand, silt and clay, and on three different earths coming from existing rammed earth constructions. In order to be able to produce samples as identical and homogeneous as possible, a mold has first been designed, which enable to manufacture cylindrical samples with diameter of 3.5cm and height of 7cm. A triaxial cell was used and, the second step was to design different devices allowing the measurement of axial and radial deformations, the conditioning at constant temperature, and the command of a variable moist air flux at both sides of the sample. Different types of tests have thus been realized : triaxial tests at different relative humidity, as well as swelling tests. The mechanical parameters thus obtained have been analyzed in comparison with material characteristics measured in parallel. Finally, results of swelling tests have been analysed using numerical modelling, in order to assess more complex material characteristics. This thesis work ends with an additional study, aiming at evaluating the impact of scale change on the mechanical parameters previously measured. Tests have been conducted on sample approximatively twice larger, and thanks to a simpler experimental device using measurement through image correlation
Salehian, Ali. "PREDICTING THE DYNAMIC BEHAVIOR OF COAL MINE TAILINGS USING STATE-OF-PRACTICE GEOTECHNICAL FIELD METHODS." UKnowledge, 2013. http://uknowledge.uky.edu/ce_etds/9.
Full textRotta, Giovani Vilnei. "Plastificação de um solo cimentado curado sob tensão." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2005. http://hdl.handle.net/10183/7729.
Full textTo evaluate the contribution of cementation on the stress-strain behaviour of cemented soils, as well as to quantify the variation of the initial yielding stress and yielding stress increment based on the curing void ration, a series of eighteen isotropic compression tests were performed en artificially cemented samples cured under different confining stresses, void ratio and cement content. The samples were initially consolidated to different stresses on the normal compression line of the non-cemented soil, in order to simulate the soil formation at different depths in cemented sedimentary deposits. After consolidated, the samples were cured and then isotropic increments of tension were applied. Complementary, nineteen drained triaxial tests were performed on artificially cemented samples cured under different confining stresses and void ratio in order to analyze the modification on the shear strength parameters, deformability and yielding based on the void ratio and curing stress. At the end, a new mathematical model was proposed to simulate the isotropical tests performed on samples cured with different void ratio and cement content, describing the theorical behavior of the soil elements situated on different depths of a fictitious deposit of cement soil. The model’s ability to simulate the results of the isotropic tests performed for a wide range of curing void ratio and cement was also presented. Comments about the simulations of samples cured with low and high void ratios and consolidated to high isotropic stresses are also presented together with an analysis of the three additional parameters required by the model in relation to Cam Clay model: a parameter measuring the cementation level, a parameter defining the kind of cementing structure behaviour (rigid, rigid-plastic, linear, etc.) and a parameter that relates the stress magnitude of the cementing structure with the cementation level of the sample.
Kido, Ryunosuke. "Microscopic Characteristics of Partially Saturated Soil and their Link to Macroscopic Responses." Kyoto University, 2019. http://hdl.handle.net/2433/242476.
Full textMoulin, Gérard. "Etat limite d'une argile naturelle : l'argile de pornic." Nantes, 1988. http://www.theses.fr/1988NANT2028.
Full textColliat-Dangus, Jean-Louis. "Comportement des matériaux granulaires sous fortes contraintes : influence de la nature minéralogique du matériau étudié." Grenoble 1, 1986. http://www.theses.fr/1986GRE10032.
Full textKostiha, Vojtěch. "Zesilování železobetonových sloupů ovinutím FRP tkaninou." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-390261.
Full textDareeju, Biyanvilage. "Performance evaluation of unsaturated rail track foundations under cyclic moving wheel load." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/102697/4/Biyanvilage%2520Sampath%2520Sri%2520Sameera_Dareeju_Thesis.pdf.
Full textDalla, Rosa Francisco. "Comportamento mecânico de um solo cimentado curado sob tensão em ensaios triaxiais." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2006. http://hdl.handle.net/10183/8685.
Full textThe behavior of cemented structured soils is strongly influenced by the existing stress state during the addition of the cementation agent. The common procedures for laboratory sampling usually cause damage to the natural structure of the materials, hindering, many times, the identification of the real behavior in regard to deformability and stiffness properties. The simulation, in laboratory environment, of confining conditions during the cement structure formation turns to be a mandatory circumstance for the study of the material’s behavior. Inside this context, this work aims to evaluate the influence of the existing confining stress (stress cure) during the cement formation in the behavior of the material, through isotropic drained triaxial tests. Thus, it suggested in this study the usage of artificially cemented soil cured under stress, with parallel observation of the influence of the cement degree, as well the effects from the confining stress used during the shearing stage. It was also evaluated deformability and strength characteristics through behavior analyses of the materials. An assessment of the yield surfaces was carried on from soil cemented small deformation analysis. The evaluation of stress-dilatancy was developed based on the exam of relatively large deformation behavior. The results showed that the general behavior of this material was strongly influenced by the variation of the stress curing both at small strains and at relatively large strains.
Tounsi, Hafssa. "Modélisation THMC de la congélation artificielle des terrains : Application à la mine de Cigar Lake." Electronic Thesis or Diss., Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEM053.
Full textArtifical ground freezing (AGF) has been used for decades as a temporary soil stabilisation and waterproofing technique inorder to solve civil or mining engineering problems at lower costs. A successful implementation of this technique requires the use of numerical tools to predict the freezing evolution and the site stability. Through a thermodynamically consistent framework, a fully coupled thermo-hydro-mechanical formalism, considering the salinity effect and capturing the most relevant phenomena of ground freezing, is derived. The formalism includes an elasto-viscoplastic constitutive model, able to correctly reproduce the mechanical behavior of frozen soil, and fitted against temperature and strain rate-controlled triaxial tests carried out using a newly-developed experimental facility. The proposed approach is validated by meansof freezing laboratory tests, carried out on specimens initially fully saturated with pure water or with sodium chloride solutions at various concentrations. At the field scale, the formalism is applied to the case of the Cigar Lake mine. Fully coupled thermo-hydro-mechanical simulations of the ground freezing and excavation activities taking place in the mine are performed, in order to predict the freezing evolution in the ground and its influence on the ground movements in the vicinity of production tunnels excavated below the frozen ground
Dalla, Rosa Francisco. "Efeito do estado de tensões de cura no comportamento de uma areia artificialmente cimentada." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/32004.
Full textThe laboratory study of mechanical performance of artificially cemented soils is normally associated with the mechanical behaviour of geomaterials that were created in field. The behaviour of artificially cemented soils has substantial influence of density and the stress state that these materials have been submitted during the particles cementation. Thus, an alternative to the understanding of cement effects in these soils is the preparation of a similar environment where the specimens can be submitted the cementation while a specific stress state is applied, promoting the respective void ratio reduction. Following this approach, this study aims to show the results of triaxial tests carried out in an artificially cemented soil, which was cured at different stress states. The results have shown that the changing of stress state of curing, as well as the intensity of the confining stress during the cure, presented considerably influence in the stress-strain-dilatancy of the artificially cemented samples.
Baumgarten, Lars. "Gesteinsmechanische Versuche und petrophysikalische Untersuchungen – Laborergebnisse und numerische Simulationen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2016. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-202612.
Full textChen, Chih-Wei, and 陳智偉. "Development of a Triaxial Stress Sensor." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/79615078448273225344.
Full textDong, Zuo-Chun, and 董作群. "Using digital image correlation in triaxial stress sensor." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/11275044670372839084.
Full text國立交通大學
機械工程系所
104
The present study aims to using DIC(Digital Image Correlation) in the development of a triaxial stress sensor system.The sensor can measure normal and shear stress at the same time. Toward this end, a standard operating procedure for manufacturing a novel triaxial stress sensor has been established. The sensor system includes a flexible and transparent material(PDMS), a series of image sensors as well as a data acquisition and processing system. Therefore, when the material deforms with external load, using image sensors and DIC algorithm to calculate the displacement of the material from the images. The stress-displacement relationship of the PDMS material, obtained by means of calibration experiments and numerical simulations, can then be incorporated to recover the normal and shear stress.In this thesis, according to normal and shear and both force, present recover result with overall system. the results will compare with numerical simulations.
Tolle, Michael C. "Ductile facture of metals under high triaxial stress states." Thesis, 1994. http://hdl.handle.net/1957/35695.
Full textTu, Ming-Tsung, and 杜明璁. "Triaxial Stress Wave Tests on Isotropic Compressed Saturated Soils." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/44716176994004742738.
Full text淡江大學
土木工程學系
88
The objective of this study is to understand the effects of the factors that include the height of specimens, the shape of the soil particles, effective cell pressure, initial relative density, the frequency of the waves, percentage of clayey finers and the ways of the load applied on the shear wave velocities of saturated soils under isotropic compression. The tests are conducted by the triaxial stress wave instrument at the Department of Harbor and River Engineering of NTOU which is similar to those suggested by Hsu(1997) and Hsu(1999). By comparing the test results, the height of the specimen is found not affecting the shear wave velocities. The wave velocities will increase with the increase of the initial relative density, and they will increase with the increase of the effective cell pressure significantly. The wave velocities of rounded soils are found higher than the subangular soils. For quartz sand, the optimum frequency to measure the shear wave velocities is from 10 to15 kHz. Adding bits of clay(<10%) into quartz sand will increase the shear wave velocities(<7%). The ways of loading applied does not influence the material shear wave velocities very much.
Jan, Fuh-Jye, and 詹富傑. "Preliminary Development and Analyses of "Stress-Wave Triaxial Testing Apparatus"." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/55409819980009023131.
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