Bibliografie tematiche / Coulomb-Mohr

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Letteratura scientifica selezionata sul tema "Coulomb-Mohr"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 18 febbraio 2022

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Articoli di riviste sul tema "Coulomb-Mohr"

1

Mestat, Philippe. "Loi de Mohr-Coulomb". Revue Française de Génie Civil 1, n. 1 (gennaio 1997): 189–92. http://dx.doi.org/10.1080/12795119.1997.9692109.

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2

Labuz, Joseph F., e Arno Zang. "Mohr–Coulomb Failure Criterion". Rock Mechanics and Rock Engineering 45, n. 6 (3 luglio 2012): 975–79. http://dx.doi.org/10.1007/s00603-012-0281-7.

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3

Yan, Zhi Xin, Jian Duan, Ping Jiang e Hou Yu Wang. "A Study on Constitutive Model and Parameters of Rock Slope Stability". Materials Science Forum 575-578 (aprile 2008): 1210–16. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.1210.

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In this paper, taking elastic and plastic characteristics of rock into account, the authors have studied the relationship between different constitutive models. By transforming material parameters merely, on the basis of Equivalent Mohr-Coulomb Yield Criterion, the researchers achieved the application of these relationship in the computer program-Ansys5.7. They also have discussed the magnitude relationship between the transformed parameters and the original ones. By analyzing the cases of rock slope with obvious sliding surface, the researchers proved that it is liable to replace Mohr-Coulomb Yield Criterion with Equivalent Mohr-Coulomb Yield Criterion. We can use Equivalent Mohr-Coulomb Yield Criterion to simulate rock material, the results are smaller and more conservative than the standard ones. Meanwhile, the authors indicate that it is beneficial to apply Equivalent Mohr-Coulomb Yield Criterion to simulate rock material in rock slope projects with obvious sliding surface which have accurate standard requirements about displacement.
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4

Lee, Youn-Kyou. "Intermediate Principal Stress Dependency in Strength of Transversely Isotropic Mohr-Coulomb Rock". Journal of Korean Society For Rock Mechanics 23, n. 5 (31 ottobre 2013): 383–91. http://dx.doi.org/10.7474/tus.2013.23.5.383.

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5

Liu, Jian Hua, e Wei Shen Zhu. "A New Elastic-Plasticity Yield Criterion for Rock and Soil". Advanced Materials Research 250-253 (maggio 2011): 1342–47. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.1342.

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In this present paper a new yield criterion called M-D criterion is established based on the average of Mohr-Coulomb and Drucker-Prager criterion. The new M-D criterion is integrated with a revised FLAC3D method for mechanical analysis. Comparisons between the results of M-D, Mohr-Coulomb and Drucker-Prager are made by cases study. The study shows that results of M-D criterion are basically between the results of Mohr-Coulomb and Drucker-Prager and have the feature of being medial in quantity.
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6

Török, János, e Stéphane Roux. "Heterogeneous Mohr-Coulomb plastic material". Granular Matter 2, n. 2 (1 maggio 2000): 71–75. http://dx.doi.org/10.1007/s100350050037.

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7

Tschuchnigg, Franz, Gertraud Medicus e Barbara Schneider-Muntau. "Slope stability analysis: Barodesy vs linear elastic – perfectly plastic models". E3S Web of Conferences 92 (2019): 16014. http://dx.doi.org/10.1051/e3sconf/20199216014.

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The results of slope stability analysis are not unique. Different factors of safety are obtained investigating the same slope. The differences result from different constitutive models including different failure surfaces. In this contribution, different strength reduction techniques for two different constitutive models (linear elastic - perfectly plastic model using a Mohr-Coulomb failure criterion and barodesy) have been investigated on slope stability calculations for two different slope inclinations. The parameters for Mohr – Coulomb are calibrated on peak states of element tests simulated with barodesy for different void ratios. For both slopes the predictions of the factors of safety are higher with barodesy than with Mohr-Coulomb. The difference is to some extend explained by the different shapes of failure surfaces and thus different values for peak strength under plane strain conditions. The plane strain predictions of Mohr-Coulomb are conservative compared to barodesy, where the failure surface coincides with Matsuoka-Nakai.
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8

Jiang, Zhu Jin, Wu Jun Cai e Dao Sheng Ling. "Coulomb-Cam Model for Dilatancy and Work-Softening of Sand". Advanced Materials Research 446-449 (gennaio 2012): 1602–5. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1602.

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Cambridge model gets the extensive application, which has advantages of rigorous theoretical derivation and model parameters which can entirely be obtained by triaxial tests, while it has deficiencies of the narrow applicative scope and describing the dilatancy hardly. As the most widely used strength theory, Mohr-Coulomb model can directly represent shear strength of soil material simply, without consideration for compression deformation yet. On account of the critical state of dilatancy defined comprehensively, this paper based on the description of dilatancy combines the advantage of Cambridge model and Mohr-Coulomb strength theory, applying to compression deformation and conciseness of Mohr-coulomb model, reflecting shear deformation and puts forward an elastic-plastic model—Coulomb-Cam model. At last, this constitutive model, proved by the contrast of numerical simulation and GDS triaxial tests is of the priority in representing the dilatancy and work-softening rationally.
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9

Jung, Yong-Bok, Eui-Seob Park, Dong-Woo Ryu e Dae-Sung Cheon. "Analysis of Whole Tunnel Stability by Using Rock Mass Classification and Mohr-Coulomb Analytical Solution". Journal of Korean Society For Rock Mechanics 23, n. 4 (31 agosto 2013): 280–87. http://dx.doi.org/10.7474/tus.2013.23.4.280.

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10

Gesualdo, A., V. Minutolo e L. Nunziante. "Failure in Mohr–Coulomb soil cavities". Canadian Geotechnical Journal 38, n. 6 (1 dicembre 2001): 1314–20. http://dx.doi.org/10.1139/t01-043.

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In many cavities, resulting from both natural excavation and anthropic action, the phenomenon of the collapse of blocks from the cavity roof presents a serious safety hazard. In a previous publication the authors proposed a method to calculate the shape and dimensions of the collapsing block by means of the upper bound theorem of the plasticity theory. The soft rock material was modelled by means of the Mohr–Coulomb yield criterion, and the associated flow rule was considered for strain plastic velocity. The linear yield criterion was suitably regularized by means of a circle in the tensile zone. The boundary of the collapsing block is described by a paraboloid surface. An optimization procedure formulated in standard Kuhn–Tucker form and an analytical solution were obtained. The above-mentioned algorithm has been successfully applied to common soils of southern Italy. To validate the theoretical formulation, several numerical tests are performed. These tests show an optimal agreement with the closed-form solution. Therefore the proposed modelling may be used as an efficient guideline for the cavity-strengthening design.Key words: roof stability, regularized Mohr–Coulomb material, limit analysis, failure mechanics.
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Più fonti

Tesi sul tema "Coulomb-Mohr"

1

Laing, Y. "Mohr-Coulomb parameters and soil indentation tests". Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370146.

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2

COSTA, Daniel Beserra. "Análise da deformação permanente de misturas asfálticas a partir dos critérios de Mohr Coulomb". Universidade Federal de Campina Grande, 2018. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1538.

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Capes
A deformação permanente é definida como o acúmulo de pequenas quantidades de deformação não recuperáveis resultante da aplicação das cargas dos veículos. A deformação permanente na camada de revestimento asfáltico pode ser oriunda por três mecanismos: deformação permanente por densificação, por uso e por fluência da mistura. Dado que as temperaturas de serviço da camada de revestimento estão em torno de 40 a 60 °C, a mistura asfáltica nesse intervalo de temperatura se comporta como um material sólido. Sendo assim, é razoável supor que os mecanismos de falha aplicáveis aos materiais sólidos sejam válidos para as misturas de asfálticas. Sendo o critério Mohr-Coulomb amplamente utilizado para descrever as características de cisalhamento de materiais sólidos, poderá ser utilizado para obtenção do ângulo de atrito interno da mistura, bem como o seu intercepto coesivo. Este trabalho teve como objetivo a determinação de ângulos de atrito internos de diferentes misturas asfálticas e sua influência no comportamento mecânico, em especifico, na resistência à deformação permanente destas misturas. Como forma de atingir o objetivo da pesquisa foi desenvolvido um programa experimental visando à avaliação das propriedades mecânicas relacionadas ao ângulo de atrito interno das misturas asfálticas com CAP 50/70 e E – 55/75. Foi possível executar análises em laboratório a partir da determinação de parâmetros de ruptura por cisalhamento, com o auxílio da teoria de Mohr-Coulomb, tendo como inferência o desempenho de misturas estudadas em campo. Verificou-se que, a cada acréscimo de 5% de partículas graúdas em uma faixa granulométrica, as misturas estudadas apresentaram, em geral, um ganho de 1° (Grau) no ângulo de atrito interno para cada faixa estudada. Entretanto, deve ser observado o limite de 30 a 35% de partículas graúdas para cada mistura. Pode-se concluir que: os parâmetros de ruptura por cisalhamento, ângulo de atrito interno e intercepto coesivo são fatores determinantes no desempenho a deformação permanente de misturas asfálticas. Para os ligantes utilizados os resultados indicaram que o acréscimo do ângulo de atrito interno resulta numa maior resistência a deformação permanente.
Permanent deformation is defined as the accumulation of small amounts of non-recoverable deformation resulting from the application of vehicle loads. The permanent deformation in the surface layer of asphalt pavements can come from three mechanisms: permanent deformation by densification, by use and by creep of the mixture. Since the service temperatures of the pavement surface layer are around 40 and 60 ºC, the asphalt mixture, in this temperature range, behaves as a solid material. Therefore, it is reasonable to assume that failure mechanisms applicable to solid materials are valid for asphalt mixtures. As the Mohr-Coulomb criterion is widely used to describe the shear characteristics of solid materials, it can be used to obtain the internal friction angle of the asphalt mixture as well as to estimate its cohesive intercept. This work had as objective to determine the internal angles of friction of different asphalt mixtures and their influence on the mechanical behavior, in particular, on the resistance to permanent deformation of these mixtures. In order to achieve the objective of this research, an experimental program was developed to evaluate the mechanical properties related to the internal angle of friction of asphalt mixtures with the 50/70 asphalt binder and the E 55/75 asphalt binder. It was possible to perform laboratory analyses from the determination of shear rupture parameters, supported by the Mohr-Coulomb's theory, inferred by the performance of mixtures studied in the field. It was verified that, at each increment of 5% of coarse particles in a particle size range, the studied mixtures presented, in general, a gain of 1° (degree) in the internal angle of friction for each size range studied. However, the limit of 30 to 35% of coarse particles should be observed for each mixture. It can be concluded that: the parameters of shear rupture, internal angle of friction and cohesive intercept are determining factors in the permanent deformation performance of asphalt mixtures. For the asphalt binders used, the results indicated that the increment of the internal angle of friction results in a greater resistance to permanent deformation.
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3

Huang, Xixi. "Influence des particules fines sur la stabilité d'un milieu granulaire". Phd thesis, Ecole Centrale de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00963654.

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L'objectif de ce travail est de comprendre l'influence des particules très fines sur le phénomène de ré-agglomération lors du broyage. Des billes de verre de taille 0 à 20 µm avec un pourcentage massique variant entre 0 à 1% sont ajoutées dans un tas granulaire de billes de verre de 200 à 300 µm dans un tambour tournant cylindrique de diamètre et longueur 10 cm. La présence des particules fines montre un effet ambivalent sur la stabilité du tas granulaire. Nous avons établi un diagramme de stabilité du milieu granulaire en fonction de la concentration de particules fines et cherché à quantifier l'effet des fines combiné avec d'autres paramètres (humidité relative et vitesse de rotation du tambour). La stabilité d'un tas granulaire dans un tambour tournant est déterminée par la mesure de son angle maximum de stabilité θm. Dans un premier temps, nous avons étudié l'évolution de cet angle à des vitesses de rotation différentes. Les expériences montrent qu'à faible concentration (< 0; 15%), le tas se déstabilise par avalanches lorsque le tambour tourne, θm diminue lorsqu'on augmente la quantité de fines. Quand la vitesse de rotation augmente, le mouvement du tas évolue du régime d'avalanche intermittent au régime d'écoulement continu. En revanche, lorsque la concentration des fines est supérieure à 0,15%, la déstabilisation du tas se traduit par un phénomène de stick-slip à la paroi du tambour, et la quantité de fines augmente la stabilité du tas. Ce comportement apparemment contradictoire est lié au fait que la localisation de la déstabilisation est modifiée. Dans le régime des faibles concentrations, les avalanches commencent à la surface du tas, et le remplissage de l'espace intermédiaire entre les grosses billes par les fines rend la surface de plus en plus lisse, ce qui déstabilise le tas. Par ailleurs, les fines induisent une augmentation de la cohésion du tas par la nucléation des ponts capillaires entre les grains. Ainsi, dans le régime des fortes concentrations, le tas granulaire se comporte comme un corps solide et la déstabilisation a lieu à l'interface tas-tambour. Nous avons également étudié l'influence de l'humidité relative sur la stabilité et montré que dans le régime de faible concentration de particules fines, la déstabilisation est indépendante de l'humidité. D'autre part dans le régime des hautes teneurs en fines, une humidité relative élevée induit une forte cohésion due à la condensation capillaire entre les grains et le tambour ce qui entraîne une augmentation de l'angle maximum de stabilité.
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4

Houdoux, David. "Étude expérimentale du lien entre réarrangements locaux et friction interne dans un matériau amorphe modèle". Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S066.

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Lorsqu’il est soumis à une contrainte homogène, un matériau granulaire se déforme d’abord de manière homogène puis, passé un certain seuil, de manière hétérogène. Cependant, les mécanismes de plasticité sous-jacents à l’origine de ce comportement ne pas complètement compris. L’objectif de cette thèse est d’étudier l’organisation de la plasticité afin de comprendre la transition d’une déformation homogène vers une déformation hétérogène. Les expériences sont menées sur un matériau amorphe modèle constitué de billes de verre d’un diamètre moyen de l’ordre de la centaine de micromètres. Le matériau granulaire est soumis à un test biaxial en déformation plane et l’organisation de la plasticité est observée par spectroscopie de diffusion multiple de la lumière (DWS). Au cours d’une expérience de compression uni-axial, le champ de plasticité peut se décomposer en deux parties indépendantes et évoluant à des échelles de déformation différentes. Les orientations de ces deux structures sont déterminées quantitativement. On observe alors une partie lentement variable et moyennée dans le temps qui s’oriente selon un angle prédit par le modèle de Mohr-Coulomb ; ainsi qu’une partie fluctuante qui peut être décrite à partir de la théorie Eshelby décrivant la redistribution de la contrainte après un réarrangement plastic local dans un matériau amorphe. D’autre part, pour la première fois, des évènements plastiques ont pu être observés et caractérisés à l’intérieur des bandes de cisaillement. Une analogie qualitative avec la sismicité terrestre en est déduite
When a homogeneous stress is applied on a granular material, it first, shows a homogeneous strain and then, above a certain threshold, a heterogeneous strain. However, underlying plasticity mechanisms which trigger this behavior are not known very well. The aim of this thesis is to study how the plasticity organizes in order to understand the transition between a homogeneous strain towards a heterogeneous one. Experiments are carried out on a model amorphous medium consisting of an assembly of glass beads with an average diameter about one hundred microns. A biaxial compressive test in plan strain conditions is performed on the granular material and the organization of the plasticity is observed using the Diffusing Wave Spectroscopy (DWS) technique. During a unixial compression experiment, the plastic field can be decomposed in two components operating on two decoupled strain increment scales. The orientations of these two structures are determined quantitatively. As a result, we observe a slowly varying and coarse-grained part which concentrates along a macroscopic direction corresponding to the Mohr-Coulomb angle; and a fluctuating part that may be related to an Eshelby-like stress redistribution after a plastic rearrangement in an amorphous material. Otherwise, for the first time, we observe and characterize plastic events within shear bands. A qualitative analogy with earth seismicity is deduced
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5

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 application of a parameter sensitivity analysis on models created in Plaxis. The purpose of the analysis is to identify which factors cause discrepancies between the models and the actual displacements monitored on site. The project being examined is located in central London. The analysis focuses on the displacements of existing tunnels below the site caused by the demolition of two buildings. An analysis was carried out to investigate the significance of different parameters, of different material models and methods of analysis, of 3D effects and of inaccurate groundwater data. Ground investigations, laboratory tests and published data were the main sources used to collect reliable initial input parameters for the material models. A model was created in Plaxis 2D using the Mohr-Coulomb and the Hardening Soil with small-strain stiffness material models, using two types of undrained analysis. A model using the Mohr-Coulomb material model was created in Plaxis 3D as well. A sensitivity analysis was then carried out on the 2D models to identify which input parameters were most significant to the tunnel displacements. The results were compared to monitoring data and a back-analysis was carried out to produce more accurate results. The initial and adjusted input parameters were also tested on the 3D model. Finally, the groundwater level was altered. The results indicate that soil stiffness and effective cohesion are the most significant. Small-strain stiffness is shown to be especially important when analysing small tunnel deformation. The 3D model generally yielded more accurate results than the 2D model, while the groundwater level did not appear to affect the deformations.
I tätbebyggda städer bör samspelet mellan olika konstruktioner, från skyskrapor till tunnelsystem, analyseras noga så fort ett nytt projekt ska påbörjas. Detta är kritiskt på grund av den förändrade spänningsfördelning som uppstår i marken vid varje ny byggnation. Marken häver sig, stödmurar deformeras och den omkringliggande marken sätter sig när en byggnad rivs. Denna process kan modelleras för att uppskatta hur stora deformationerna kommer att bli. Det här examensarbetet utvärderar hur effektiv en sådan modell är. En känslighetsanalys utfördes på modeller skapade i Plaxis. Syftet med denna analys är att undersöka vilka faktorer som orsakar skillnader mellan modellerna och mätdata. Projektet ligger i centrala London och analysen fokuserar på tunneldeformationer orsakade av att två byggnader rivs. Tunnlarna befinner sig i ett lager av Londonlera under byggarbetsplatsen. En analys utfördes för att undersöka huruvida olika parameterar, olika materialmodeller och analysmetoder, 3D effekter och grundvattennivån påverkar tunnelförflyttningarna. Markundersökningar, labbtester och publicerad data användes som grund för att bestämma indatavärden. En 2D modell skapades i Plaxis genom att använda materialmodellerna Mohr-Coulomb och ”Hardening Soil with small-strain stiffness”. En Mohr-Coulomb modell skapades dessutom i Plaxis 3D. En känslighetsanalys utfördes sedan på 2D modellen för att identifiera vilka parametrar som påverkade tunnelförflyttningarna mest. Resultaten jämfördes med mätdata och viktiga parameterar ändrades för att ge bättre resultat. Inverkan av att ändra dessa värden undersöktes även i 3D modellen. Slutligen undersöktes påverkan av en förhöjd grundvattennivå. Resultaten antyder att jordens styvhet och den effektiva kohesionen har störst inverkan på resultaten. Styvheten vid små töjningar visar sig vara särskilt viktigt eftersom deformationerna år små. 3D modellen gav generellt sätt mer korrekta resultat än modellen i 2D. En högre grundvattennivå påverkade inte resultaten nämnvärt.
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6

Buelna, Moises I. "The Role of Soil Stiffness in Reverse Fault Rupture Propagation". DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1804.

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A nonlinear Mohr-Coulomb constitutive model with a strain dependent yield surface and non-associated flow was employed to study the plastic soil properties which affect the rate of surface fault rupture propagation in reverse events. These numerical simulations show a trend for soils with higher stiffness to have a higher rate of rupture propagation. Additionally the study shows the effects of strain softening and hardening on the rate of rupture propagation. Soils which strain harden exhibiting ductile behavior typically require more basal offset to rupture to the surface than soils which strain soften exhibiting brittle behavior. These results agree with our previous fault box studies, which showed that soils with higher near surface shear wave velocity were more likely to propagate rupture to the surface for a given reverse event. The numerical modeling allowed for a more comprehensive evaluation of material types and fault angles than the fault box, and provided confidence in these findings.
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7

Pezo, Oscar Bartra. "Análises numéricas de provas de carga em radier estaqueado utilizando o método dos elementos finitos". Universidade Federal de Pernambuco, 2013. https://repositorio.ufpe.br/handle/123456789/10447.

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Submitted by Israel Vieira Neto (israel.vieiraneto@ufpe.br) on 2015-03-04T17:54:03Z No. of bitstreams: 2 DISSERTAÇÃO Oscar Bezerra Pezo.pdf: 5982903 bytes, checksum: b9759670a74301d6ab644f498ad40ad1 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5)
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CAPES
A presente dissertação analisa, em termos do comportamento carga-recalque, um banco de dados organizado por Wilson Cartaxo Soares (2011), de fundações em grupo de estacas e radier estaqueados, executados em solo arenoso de várias camadas da área litorânea de João Pessoa/PB, com 07 provas de carga, estáticas, em estacas do tipo Hollow Auger, construídas em escala real, com 300 mm de diâmetro e 4,5 m de comprimento. Os dados foram retroanalisados com o Método dos Elementos Finitos (MEF 3D), utilizando o programa CESAR-LCPC v4 (Cleo 3D versão 1.07). Na modelagem do comportamento tensão-deformação do solo foi utilizado o modelo constitutivo de Mohr-Coulomb. Os parâmetros geotécnicos iniciais utilizados em cada um desses modelos foram obtidos através de correlações a partir de valores de NSPT obtidos por SOARES (2011). Os resultados dessas simulações numéricas foram comparados com os resultados experimentais, medidos nas provas de carga. Definiu-se os parâmetros geotécnicos do solo a partir da retroanálise por meio da modelagem numérica para serem empregados em futuras simulações no maciço. Análises paramétricas são executadas com o intuito de obter um maior conhecimento do comportamento da fundação em radier estaqueado, usando o modelo elásticoplástico de Mohr-Coulomb. Isso ocorre mediante algumas alterações de sua configuração que inclui a espessura do radier, número, diâmetro, espaçamento e comprimento das estacas embutido no solo. Carga vertical central está sendo considerada para a análise paramétrica. O recalque máximo, recalque diferencial e distorção angular do radier diminuem, com o aumento da espessura do radier, do número, comprimento e diâmetro das estacas.
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8

Ngadi, Abderrazzaq. "Fluctuations de forces dans le processus de compression d'un milieu granulaire modèle". Paris 6, 1999. http://www.theses.fr/1999PA066670.

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9

Johansson, Josefin, e Matilda Wennberg. "Modellering av grävpålar i Plaxis 2D : En parameterstudie applicerad på nya Vårbybron, Stockholm". Thesis, KTH, Jord- och bergmekanik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299066.

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I samband med Förbifart Stockholm och Tvärförbindelse Södertörn förväntas en flaskhals skapas vid Vårbybron i södra Stockholm. För att förhindra överbelastning planeras en nybyggnation där pålgrundläggning med grävpålar föreslås. Markförhållanden är ovanliga i Stockholm, med över 100 meter ned till berg. Komplexa omständigheter i området gör det nödvändigt att analysera markrörelser som verkar på grundläggningen. Syftet med studien är att undersöka horisontella- och vertikala sättningar vid ett brolandfäste. Syftet är vidare att analysera vilken typ av numerisk konstitutiv modell som är lämplig med hänsyn till studiens specifika fall och område; Mohr-Coulomb (MC), Hardening Soil (HS) och Hardening Soil med small-strain stiffness (HSS). Slutligen ska jordparametrarnas väsentlighet avgöras i en parameterstudie. Sonderingsdata tillämpas i studien för att skapa en jordlagermodell i AutoCAD Civil 3D 2019 Metric och vidare simulering av sättningar i Plaxis 2D. Vid modellering av sättningar i förekommande geologi rekommenderas att en avancerad modell används, med fördel HSS. Däremot kräver mer avancerade modeller noggranna indata för tillförlitligt resultat och ytterligare tester för styvhetsparametrar bör utföras. I detta projekt kan dyrare tester tänkas sänka slutgiltig budget, eftersom underskattning av moduler i djupa och fast lagrade jordar baserade på konservativt valda moduler ger upphov till en dyrare konstruktion.
In conjunction with the opening of the Stockholm Bypass and Tvärförbindelse Södertörn, a bottleneck is expected at the bridge Vårbybron in southern Stockholm. To prevent traffic congestion, a new construction is planned where pile foundation consisting of bored piles is proposed. The ground conditions are unusual and not typical for Stockholm involving over 100 meters distance to rock. Complex circumstances in the area makes it complicated as well as necessary to analyze ground movements. The aim of the study is to investigate horizontal- and vertical settlements at a bridge abutment. The aim is further to analyze which type of numerical constitutive model that is appropriate with respect to the specific case and area; Mohr-Coulomb (MC), Hardening Soil (HS) and Hardening Soil with small-strain stiffness (HSS). Finally, the significance of the soil parameters is to be determined in a parameter analysis. Results from soundings are used to create a geological model in AutoCAD Civil 3D 2019 Metric. Furthermore, simulation of settlements in Plaxis 2D is performed. It is recommended to apply advanced models for this type of geology, advantageously HSS. However, more advanced models require accurate input data to obtain reliable results, and additional tests for stiffness parameters must be performed for accuracy in the results. In this project, more expensive tests can be thought of as lowering the final budget, as underestimation of modules in deep and stiff soils based on conservatively selected modules leads to an unnecessarily expensive construction.
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Sahlaoui, Ramzi. "Panneaux en maçonnerie renforcés à l'aide de matériaux composites : approche de type calcul à la rupture et étude expérimentale". Phd thesis, Université Paris-Est, 2011. http://pastel.archives-ouvertes.fr/pastel-00672356.

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La maintenance, la réparation et le renforcement de murs en maçonnerie par matériaux composites collés nécessitent le développement de méthodes et techniques d'évaluation de l'aptitude au service et de requalification tant pour leur restauration fonctionnelle que pour leur adaptation à de nouvelles contraintes (évolution du zonage sismique par exemple). Le présent travail de thèse a pour objectif de proposer un outil d'évaluation par calcul de l'état limite ultime de murs en maçonnerie, renforcés par composites collés, chargés dans leur plan.Les travaux effectués concernent la modélisation par homogénéisation de murs en maçonnerie et une campagne expérimentale de caractérisation du transfert de charge entre un renfort en tissu de fibres de carbone et un support en blocs creux de béton par le biais d'un joint de colle. Pour modéliser la résistance des murs maçonnés, nous proposons une loi élastique parfaitement plastique pour le comportement dans le plan d'une maçonnerie constituée de blocs liés par des joints de mortier. Le convexe de plasticité est obtenu par une technique d'homogénéisation périodique qui prend en compte la nature tridimensionnelle de la cellule de base. On obtient alors un convexe limité par plusieurs surfaces de charge. Un algorithme numérique original est ensuite proposé et programmé dans le logiciel aux Eléments Finis ABAQUS. Des simulations numériques utilisant le module développé sont présentées
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Capitoli di libri sul tema "Coulomb-Mohr"

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Hack, Robert. "Mohr-Coulomb Failure Envelope". In Encyclopedia of Earth Sciences Series, 667–69. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73568-9_207.

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Labuz, Joseph F., e Arno Zang. "Mohr–Coulomb Failure Criterion". In The ISRM Suggested Methods for Rock Characterization, Testing and Monitoring: 2007-2014, 227–31. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-07713-0_19.

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Hack, Robert. "Mohr-Coulomb Failure Envelope". In Selective Neck Dissection for Oral Cancer, 1–3. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-12127-7_207-1.

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Mandl, Georg. "The Coulomb — Mohr Theory of Faulting". In Faulting in Brittle Rocks, 113–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04262-5_4.

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Yin, Zhen-Yu, Pierre-Yves Hicher e Yin-Fu Jin. "Elastoplastic Modeling of Soils: From Mohr-Coulomb to SIMSAND". In Practice of Constitutive Modelling for Saturated Soils, 121–76. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6307-2_5.

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Cao, Wei, Rui Wang e Jian-Min Zhang. "A Simple Anisotropic Mohr-Coulomb Strength Criterion for Granular Soils". In Springer Series in Geomechanics and Geoengineering, 3–7. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97112-4_1.

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Ma, Yongfeng, e Rangang Yu. "Uncertainty Analysis of Rock Strength Based on Mohr-Coulomb Criterion". In Green, Smart and Connected Transportation Systems, 1423–30. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0644-4_107.

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Cui, X. Z., Q. Jin, Q. S. Shang e S. T. Liu. "Mohr-Coulomb Model Considering Variation of Elastic Modulus and Its Application". In Fracture and Strength of Solids VI, 1445–48. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-989-x.1445.

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Xia, Kaiwen. "A Mohr-Coulomb Failure Criterion for Rocks Subjected to Dynamic Loading". In Springer Series in Geomechanics and Geoengineering, 367–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-32814-5_51.

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Aleksandrov, Anatoly, Gennadiy Dolgih e Aleksander Kalinin. "Equation of Limit Condition of the Three-Parameter Mohr-Coulomb Criterion". In Advances in Intelligent Systems and Computing, 787–97. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19756-8_75.

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Atti di convegni sul tema "Coulomb-Mohr"

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Sysala, Stanislav, e Martin Čermák. "Implicit constitutive solution scheme for Mohr-Coulomb plasticity". In Programs and Algorithms of Numerical Mathematics 18. Institute of Mathematics, Czech Academy of Sciences, 2017. http://dx.doi.org/10.21136/panm.2016.15.

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Rukhaiyar, S., e N. K. Samadhiya. "Analysis of tunnel considering Modified Mohr-Coulomb criteria". In Recent Advances in Rock Engineering (RARE 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/rare-16.2016.51.

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WEIR, GRAHAM J., e ROGER M. YOUNG. "DERIVATION OF MOHR-COULOMB CRITERIA FROM RIGID–PLASTICITY THEORY". In Proceedings of the Third Australasian Congress on Applied Mechanics. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777973_0014.

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F, A., e O. M. O. RAMADAN. "Tunnelling Beneath Piled Structures Based on Mohr Coulomb criterion". In Fouth International Conference on Advances in Civil, Structural and Construction Engineering - CSCE 2016. Institute of Research Engineers and Doctors, 2016. http://dx.doi.org/10.15224/978-1-63248-101-6-01.

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Yang, Zhenning, Carlton L. Ho, Richard Joy e Nandan C. Dabhade. "Influence of Water Content on the Behavior of Partially Saturated Fouled Ballast". In 2016 Joint Rail Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/jrc2016-5724.

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The water content of fouled ballast is important when considering the shear strength and deformability of the ballast, and therefore critical in evaluating whether the track is at risk of excessive deformations warranting a speed restriction order. Fouled ballast from northeastern United States was tested in the laboratory to assess changes in shear strength and deformability as a function of water content. X-ray fluorescence analysis determined that the fouling material was 95% by weight basalt in origin. No more than 5% of the fouling material could be attributed to the abraded concrete ties. The field capacity of the fouled ballast was measured to be at a water content of 10%. Freezing and thawing tests indicated that approximately 4% of mass loss could be expected as a result of 25 freeze/thaw cycles. 6-inch triaxial tests, TX-CIDC, were conducted on the ballast at water contents between dry and field capacity (10%). As the ballast was partially saturated, volume change was measured using circumferential string potentiometers. The water content had an influence on the shear strength and the modulus of elasticity of the fouled ballast. The Mohr-Coulomb friction angle decreased from 47.3° for the dry ballast to 42.5° for the field capacity ballast. The Mohr-Coulomb cohesion decreased from 3.38 psi to nearly zero with initial addition of water, but increased to 6.18 psi as the water content reached field capacity. This is likely attributable to changes in capillary tension of the partially saturated fouling material. The average shear strength, Mohr-Coulomb friction angle, Mohr-Coulomb cohesion, modulus of elasticity and Poisson’s Ratio all showed weakening and strengthening effect by addition of water.
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Roy, Kshama, Bipul Hawlader, Shawn Kenny e Ian Moore. "Effects of Post-Peak Softening Behavior of Dense Sand on Lateral and Upward Displacement of Buried Pipelines". In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-42138.

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Buried pipelines are extensively used in onshore and offshore for transportation of hydrocarbons. The response of pipeline due to lateral and upward relative displacements is one of the major concerns in pipeline design. Both physical modeling and numerical analyses have been performed in the past to understand pipeline-soil interaction mechanisms. The numerical analyses are generally performed using finite element (FE) modeling techniques. For the pipelines buried in sand, a large number of analyses available in the literature have been performed using the Mohr-Coulomb model assigning constant values of angle of internal friction (ϕ′) and dilation (ψ). However, dense sand shows post-peak softening behavior and the behavior of sand also depends on mode of shearing, such as triaxial (TX), direct shear (DS) or direct simple shear (DSS) conditions. In the present study, FE analysis of buried pipelines in dense sand is presented. The first set of analyses are performed using the built-in Mohr-Coulomb model in Abaqus FE software with constant angles of internal friction and dilation, as typically used in previous FE analysis of pipeline-soil interaction. The second set of analyses are performed using a modified Mohr-Coulomb model where pre-peak hardening, post-peak softening, density and confining pressure dependent friction and dilation angles are considered. The FE analyses are performed using the Arbitrary Lagrangian-Eulerian (ALE) approach available in Abaqus/Explicit FE software. The modified Mohr-Coulomb model is implemented in Abaqus FE software using a user defined subroutine. Shear band formation due to strain localization and failure patterns for both lateral and upward pipeline-soil interactions are discussed from the simulations with MC and MMC models. FE results show that the MMC model can simulate the load-displacement behavior and failure pattern better than the simulations with the MC model.
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Su, Kai, e Yin Li. "Discussion of SRFEM with Mohr-Coulomb Plasticity Model in Slope Stability Analysis". In 2012 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2012. http://dx.doi.org/10.1109/appeec.2012.6307001.

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González Pérez*, H., G. Jin e G. Agrawal. "Geomechanics Model Development: Robust New Proposal for Determination of Mohr-Coulomb Failure Envelope". In Second EAGE/SPE/AAPG Shale Gas Workshop in the Middle East. Netherlands: EAGE Publications BV, 2014. http://dx.doi.org/10.3997/2214-4609.20142274.

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Ma, Jeff, Joshua David Summers e Paul F. Joseph. "Application of Meshless Integral Method in Soil Mechanics". In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47046.

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An elastic-perfect plastic model associated with the Mohr-Coulomb yield criterion is applied to describe the behavior of soil material in the framework of Meshless Integral Method (MIM) [1][2]. In MIM, we obtained the governing integral equation from the weak form of elastoplasticity over a local sub-domain and the meshless function approximation is realized by using moving least-squares approximation. The advantages of this method are efficient removing of singularity by subtraction method, more accurate handling of the weak singularity, and the exact imposition of essential boundary conditions. Two flow rules of Mohr-Coulomb yield criterion are considered: associative and non-associative. Solution algorithm for elastoplastic analysis is given in detail. The results obtained through these two flow rules are compared and the meshless results are also compared to the FEM results. The numerical results show the accuracy and robustness of the meshless integral method in soil mechanics.
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Ahmed, Sheikh Sharif, Bipul Hawlader e Kshama Roy. "Finite Element Modeling of Large Diameter Monopiles in Dense Sand for Offshore Wind Turbine Foundations". In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-42218.

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With increasing demand of energy, attention to the alternative sources of sustainable energy is getting priority over the last decades. Offshore wind turbine is one of them. The most widely used foundation system for the wind turbine is the monopile, which is a large diameter single pile. In the present study, three-dimensional finite element (FE) analyses are performed to evaluate the capacity of large diameter monopiles in dense sand using the Arbitrary Lagrangian-Eulerian (ALE) approach available in Abaqus/Explicit FE software. The behavior of sand is modeled using the Mohr-Coulomb (MC) and a modified Mohr-Coulomb (MMC) model where the pre-peak hardening, post-peak softening and the effects of mean effective stress and relative density on stress-strain behavior of dense sand are considered. Comparison with physical model test results shows that the MMC model can simulate better the load-displacement response than that with the MC model. The mechanisms involved in soil deformation are also explained using FE results.
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Rapporti di organizzazioni sul tema "Coulomb-Mohr"

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Wintergerst, Gary L., Danny N. Burgess, Joshua L. Merritt e Paul E. Senseny. Axisymmetric Compression of a Mohr-Coulomb Medium with Arbitrary Dilatancy. Fort Belvoir, VA: Defense Technical Information Center, novembre 1991. http://dx.doi.org/10.21236/ada242674.

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Li, Yaning, Thomasz Wierzbicki, Michael A. Sutton, Junhui Yan e Xiaomin Deng. Mixed Mode Stable Tearing of Thin Sheet Al 6061-T6 Specimens: Experimental Measurements and Finite Element Simulations using a Modified Mohr-Coulomb Fracture Criterion. Fort Belvoir, VA: Defense Technical Information Center, novembre 2010. http://dx.doi.org/10.21236/ada531956.

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