Gotowe bibliografie tematyczne / GEOMATERIAL SUBJECT

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Gotowa bibliografia na temat „GEOMATERIAL SUBJECT”

Autor: Grafiati
Data publikacji: 11 września 2023

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Artykuły w czasopismach na temat "GEOMATERIAL SUBJECT"

1

Kim, Minkwan, and 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 (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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2

Bista, Hemanta, Sadrish Panthi, and Liangbo Hu. "Chemo-Mechanical Couplings at Granular Contact: The Effect of Mineral Dissolution and Precipitation across the Scales." Geotechnics 2, no. 1 (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, and 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 (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, and 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, and G. V. Ramana. "On Stress–Strain Function of Geomaterials Subjected to Blast-Loads." Indian Geotechnical Journal 51, no. 3 (2021): 520–38. http://dx.doi.org/10.1007/s40098-021-00527-6.

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6

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

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7

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

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8

Zhu, Wan Cheng, K. T. Chau, and Chun An Tang. "Numerical Simulation on Failure Patterns of Rock Discs and Rings Subject to Diametral Line Loads." Key Engineering Materials 261-263 (April 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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9

Murray, Ian, and Alessandro Tarantino. "Mechanisms of failure in saturated and unsaturated clayey geomaterials subjected to (total) tensile stress." Géotechnique 69, no. 8 (2019): 701–12. http://dx.doi.org/10.1680/jgeot.17.p.252.

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10

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

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