Bibliographies thématiques / GEOMATERIAL SUBJECT

Littérature scientifique sur le sujet « GEOMATERIAL SUBJECT »

Auteur : Grafiati
Publié le 11 septembre 2023

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Articles de revues sur le sujet "GEOMATERIAL SUBJECT"

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Kim, Minkwan, et Joo Hyoung Lee. « STUDY ON NONLINEAR PAVEMENT RESPONSES OF LOW VOLUME ROADWAYS SUBJECT TO MULTIPLE WHEEL LOADS / NETIESINĖS KELIO DANGOS PRIKLAUSOMYBĖS NUO MAŽO INTENSYVUMO KELIŲ, VEIKIAMŲ DAUGKARTINĖMIS RATŲ APKROVOMIS, TYRIMAS ». Journal of Civil Engineering and Management 17, no 1 (13 avril 2011) : 45–54. http://dx.doi.org/10.3846/13923730.2011.554012.

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This paper describes numerical analyses on low volume roads (LVRs) using a nonlinear three-dimensional (3D) finite element model (FEM). Various pavement scenarios are analyzed to investigate the effects of pavement layer thicknesses, traffic loads, and material properties on pavement responses, such as surface deflection and subgrade strain. Each scenario incorporates a different combination of wheel/axle configurations and pavement geomaterial properties to analyze the nonlinear behavior of thinly surfaced asphalt pavement. In this numerical study, nonlinear stress-dependent models are employed in the base and subgrade layers to properly characterize pavement geomaterial behavior. Finite element analysis results are then described in terms of the effects of the asphalt pavement thickness, wheel/axle configurations, and geomaterial properties on critical pavement responses. Conclusions are drawn by the comparison of the nonlinear pavement responses in the base and subgrade in association with the effects of multiple wheel/axle load interactions. Santrauka Straipsnyje aprašoma skaitinė mažo intensyvumo kelių analizė, taikant netiesinį—erdvinį baigtinių elementų modelį. Skirtingi dangų paviršiaus variantai analizuojami siekiant ištirti, kokiąįtaką kelio dangos elgsenai, t. y. poslinkiams ir kelio pagrindo deformacijoms, turi dangų sluoksnių storiai, eismo apkrovos ir medžiagų savybės. Kiekvienas kelio dangos variantas turi skirtingas ratų arba ašies ir geometrinių savybių formas, kad būtų galima išanalizuoti netiesinę plonos asfalto dangos paviršiaus elgseną. Šioje skaitinėje analizėje nagrinėjami netiesiniai įtempių modeliai, kurie buvo taikomi pagrindo sluoksniams, siekiant tinkamai apibūdinti geometrinę kelio dangos elgseną. Baigtinių elementų analizės rezultatai toliau nagrinėjami atsižvelgiant į asfalto dangos storį ar ašies formą ir geometrines savybes, priklausomai nuo kritinės kelio dangos būklės. Išvados buvo gautos lyginant netiesines kelių dangos priklausomybes pagrindo sluoksnyje, atsižvelgiant į jų sąveiką su daugkartine ratų apkrova.
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Bista, Hemanta, Sadrish Panthi et Liangbo Hu. « Chemo-Mechanical Couplings at Granular Contact : The Effect of Mineral Dissolution and Precipitation across the Scales ». Geotechnics 2, no 1 (1 février 2022) : 158–70. http://dx.doi.org/10.3390/geotechnics2010007.

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Strong interactions between mechanical deformation and chemical reactions may play a critical role in the response of geomaterials or geological systems to evolving environmental circumstances that may occur in both natural and engineered processes. The present study focuses on mineral dissolution and precipitation at the intergranular contact whose consequences are often manifested at the macro-scale where the mechanical and transport properties of the geomaterial may be altered. Discrete element modeling is employed to explore two applications involving such mineral transformations. The first example is primarily focused on the chemo-mechanical coupling mechanisms of intergranular contact in the natural process of pressure solution and secondary compression. The effect of the mineral dissolution on the mechanical response at the grain contact is incorporated into the contact model. Discrete element simulations are performed to examine the overall mechanical response of particle assembles subject to mineral dissolution and the results demonstrate the important role of the kinetic rate characteristics of the dissolution process. The second part of the present study revolves around the effect of mineral precipitation in an engineered process known as microbially induced calcite precipitation for potential soil improvement. The kinetics of involved bio-chemical process is incorporated into on the contact model and the simulation results indicate considerable strengthening effect. Overall, the present study demonstrates the feasibility of discrete element approach as a numerical tool to model coupled chemo-mechanical phenomena across the scales.
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Rammelkamp, Kristin, Susanne Schröder, Alessandro Pisello, Gianluigi Ortenzi, Frank Sohl et Vikram Unnithan. « Explorative Data Analysis Methods : Application to Laser-Induced Breakdown Spectroscopy Field Data Measured on the Island of Vulcano, Italy ». Sensors 23, no 13 (7 juillet 2023) : 6208. http://dx.doi.org/10.3390/s23136208.

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One of the strengths of laser-induced breakdown spectroscopy (LIBS) is that a large amount of data can be measured relatively easily in a short time, which makes LIBS interesting in many areas, from geomaterial analysis with portable handheld instruments to applications for the exploration of planetary surfaces. Statistical methods, therefore, play an important role in analyzing the data to detect not only individual compositions but also trends and correlations. In this study, we apply two approaches to explore the LIBS data of geomaterials measured with a handheld device at different locations on the Aeolian island of Vulcano, Italy. First, we use the established method, principal component analysis (PCA), and second we adopt the principle of the interesting features finder (IFF), which was recently proposed for the analysis of LIBS imaging data. With this method it is possible to identify spectra that contain emission lines of minor and trace elements that often remain undetected with variance-based methods, such as PCA. We could not detect any spectra with IFF that were not detected with PCA when applying both methods to our LIBS field data. The reason for this may be the nature of our field data, which are subject to more experimental changes than data measured in laboratory settings, such as LIBS imaging data, for which the IFF was introduced first. In conclusion, however, we found that the two approaches complement each other well, making the exploration of the data more intuitive, straightforward, and efficient.
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Nova, R., R. Castellanza et C. Tamagnini. « A constitutive model for bonded geomaterials subject to mechanical and/or chemical degradation ». International Journal for Numerical and Analytical Methods in Geomechanics 27, no 9 (2003) : 705–32. http://dx.doi.org/10.1002/nag.294.

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Pathak, Shashank, et G. V. Ramana. « On Stress–Strain Function of Geomaterials Subjected to Blast-Loads ». Indian Geotechnical Journal 51, no 3 (18 avril 2021) : 520–38. http://dx.doi.org/10.1007/s40098-021-00527-6.

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Wang, Lu Jun, et Zhi Yong Ai. « Transient Thermal Response of a Multilayered Geomaterial Subjected to a Heat Source ». KSCE Journal of Civil Engineering 22, no 9 (2 avril 2018) : 3292–301. http://dx.doi.org/10.1007/s12205-018-2035-x.

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Mehra, Sagar, et Ashutosh Trivedi. « Pile Groups Subjected to Axial and Torsional Loads in Flow-Controlled Geomaterial ». International Journal of Geomechanics 21, no 3 (mars 2021) : 04021002. http://dx.doi.org/10.1061/(asce)gm.1943-5622.0001928.

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Zhu, Wan Cheng, K. T. Chau et Chun An Tang. « Numerical Simulation on Failure Patterns of Rock Discs and Rings Subject to Diametral Line Loads ». Key Engineering Materials 261-263 (avril 2004) : 1517–22. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.1517.

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Brazilian test is a standardized test for measuring indirect tensile strength of rock and concrete disc (or cylinder). Similar test called indirect tensile test has also been used for other geomaterials. Although splitting of the disc into two halves is the expected failure mode, other rupture modes had also been observed. More importantly, the splitting tensile strength of rock can vary significantly with the specimen geometry and loading condition. In this study, a numerical code called RFPA2D (abbreviated from Rock Failure Process Analysis) is used to simulate the failure process of disc and ring specimens subject to Brazilian test. The failure patterns and splitting tensile strengths of specimens with different size and loading-strip-width are simulated and compared with existing experimental results. In addition, two distinct failure patterns observed in ring tests have been simulated using RFPA2D and thus this verifies the applicability of RFPA2D in simulating rock failure process under static loads.
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Murray, Ian, et Alessandro Tarantino. « Mechanisms of failure in saturated and unsaturated clayey geomaterials subjected to (total) tensile stress ». Géotechnique 69, no 8 (août 2019) : 701–12. http://dx.doi.org/10.1680/jgeot.17.p.252.

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Zhou, Xiao-Ping, et Chang-Qing Li. « Permeability prediction of porous geomaterials subjected to freeze-thaw cycles based on 3D reconstruction technology ». Cold Regions Science and Technology 181 (janvier 2021) : 103180. http://dx.doi.org/10.1016/j.coldregions.2020.103180.

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Thèses sur le sujet "GEOMATERIAL SUBJECT"

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Pasten, Cesar. « Geomaterials subjected to repetitive loading : implications on energy systems ». Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47740.

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Improvements in quality of life, population growth, and environmental restrictions associated with the burning of fossil fuels will accentuate the need for renewable energy and energy geo-storage. A salient characteristic of these systems is that they impose numerous cycles of effective stress, temperature, and humidity on the surrounding geomaterials. This thesis quantifies future energy consumption based on realizable scenarios and explores the behavior of geomaterials subjected to mechanical and thermal cycles in view of energy-related applications. The long-term behavior of geotechnical systems subjected to a large number of mechanical load cycles is studied with a new numerical scheme based on a hybrid finite element formulation. The numerical scheme satisfies initial conditions as well as fundamental characteristics of soil behavior, such as threshold strain, terminal density, and long-term ratcheting. Numerical results show that shallow foundations subjected to repetitive loading experience strain accumulation and stress redistribution. On the other hand, the long-term behavior of energy piles, exposed geomembranes on slopes, and jointed rock masses subjected to cyclic thermal changes is studied using a combination of numerical, analytical, and experimental methods. Results show that thermal cycles lead to the gradual accumulation of plastic displacements, which may be amplified by thermally-induced wedging in jointed rock masses. In general, cumulative effects caused by repetitive loads increase with the number of cycles, the static factor of safety, the amplitude of the cyclic excitation, and the magnitude of the cyclically-induced displacement with respect to the critical elastic displacement.
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Chapitres de livres sur le sujet "GEOMATERIAL SUBJECT"

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Eichenberger, John, Mathieu Nuth et Lyesse Laloui. « Modeling Landslides in Partially Saturated Slopes Subjected to Rainfall Infiltration ». Dans Mechanics of Unsaturated Geomaterials, 233–50. Hoboken, NJ USA : John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118616871.ch10.

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Nova, Roberto. « Slope Failure and the loss of controllability of the incremental response of a soil specimen subject to an arbitrary loading programme ». Dans Degradations and Instabilities in Geomaterials, 179–96. Vienna : Springer Vienna, 2004. http://dx.doi.org/10.1007/978-3-7091-2768-1_6.

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Chen, Wen, Christian La Borderie, Olivier Maurel, Thierry Reess, Gilles Pijaudier-Cabot et Franck Rey Betbeder. « Permeability and Microcracking of Geomaterials Subjected to Dynamic Loads ». Dans Dynamic Behavior of Materials, Volume 1, 451–59. Cham : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00771-7_55.

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Pathak, Shashank, et Gunturi Venkata Ramana. « A Stress-Strain Model for Geomaterials Subjected to Air-Blast ». Dans Proceedings of GeoShanghai 2018 International Conference : Fundamentals of Soil Behaviours, 388–96. Singapore : Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0125-4_43.

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Forquin, P. « On the Damage Mechanisms Involved in Different Geomaterials Subjected to Edge-on Impact Experiments ». Dans Dynamic Behavior of Materials, Volume 1, 295–99. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06995-1_42.

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Rima, Aya, Laurie Lacarrière, Alain Sellier et Minh-Ngoc Vu. « Numerical Modeling of Water Transfer in Geomaterials : Application to a Concrete Tunnel Subjected to Both Drying and Liquid Overpressure ». Dans International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures, 96–104. Cham : Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-33211-1_9.

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Murray, I., A. Tarantino et F. Francescon. « Crack formation in clayey geomaterials subjected to tensile (total) stress ». Dans Unsaturated Soils : Research & ; Applications, 823–28. CRC Press, 2014. http://dx.doi.org/10.1201/b17034-117.

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Kawamura, S., S. Miura et S. Yokohama. « Deformation behavior of structure-sand deposits subjected to cyclic loading and FE analysis ». Dans Deformation Characteristics of Geomaterials / Comportement Des Sols Et Des Roches Tendres. Taylor & Francis, 2003. http://dx.doi.org/10.1201/noe9058096043.ch102.

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Cambou, B., A. Danescu, C. Quetel, F. Nicot et F. Berger. « Multiscale modelling of mechanical behaviour of a tree subjected to a rock impact ». Dans Deformation Characteristics of Geomaterials / Comportement Des Sols Et Des Roches Tendres. Taylor & Francis, 2003. http://dx.doi.org/10.1201/noe9058096043.ch126.

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de Buhan, P., et M. Abdelkrim. « An illustrative model for assessing the influence of elastic non-linearity on the residual behaviour of a platform subject to traffic loading ». Dans Deformation Characteristics of Geomaterials / Comportement Des Sols Et Des Roches Tendres. Taylor & Francis, 2003. http://dx.doi.org/10.1201/noe9058096043.ch129.

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