20.500.12556/DKUM-70778 A comparison between conventional triaxial and plane-strain compression on a particulate system using 3D DEM Primerjava med običajnim triosnim in ravninsko-deformacijskim stiskanjem v posebnem sistemu s 3D MDE Granular materials such as sand are subjected to different stress paths depending on the in-situ conditions. For example, a granular system under the foundations experiences conventional triaxial compression (CTC), while it experiences plane-strain compression (PSC) in the case of the embankment of roads. Due to the difference in the stress paths, the behavior of granular materials also becomes different. This paper aims at comparing the behavior of granular materials under CTC and PSC conditions using the 3D discrete-element method (DEM). An isotropically compressed dense sample consisting of 8000 spheres was prepared numerically using periodic boundaries. The CTC and PSC tests were simulated using the same isotropically compressed dense sample to compare and explore the macro- and micro-mechanical responses of granular materials without any bias from the initial fabric of the numerical sample. Qualitatively, the simulated stress-strain responses are consistent with that observed in the experimental studies. The dilatancy index is found to be independent of the stress paths used in the present study. The b value (defined as b = (σ2 − σ3)/(σ1 − σ3) where σ1, σ2 and σ3 are the stresses in the x1 -, x2 - and x3 - directions, respectively) - axial strain curve has a close similarity with the stress ratio - axial strain curve for the PSC test. The evolution of the coordination number and the sliding contact fraction is independent of the stress paths. A link between the macro- and micro-quantities is observed and a unique macro-micro relationship is noticed, regardless of the stress paths applied in this study. Sipki materiali, kot npr. pesek, so podvrženi različnim napetostnim glede na terenske pogoje. Sipek sistem pod temelji je, na primer, podvržen običajni triosni stisljivosti (OTS), pri cestnih nasipih pa ravninski napetostno-deformacijski stisljivosti (RNS). Zaradi različnih napetostnih poti je obnašanje sipkih materialov različno. V članku je primerjano obnašanje sipkih materialov v OTS in RNS pogojih z uporabo 3D metode ločenih elementov (MLE). Z uporabo periodičnih robov je bilo iz 8000 delcev numerično pripravljenih enakosmerno stisljivih vzorcev. S tem vzorcem so bili simulirani OTS in RNS preizkusi s ciljem primerjanja in preučevanja makro- in mikro-mehanskega odziva sipkega materiala, pri čemer začetne teksture numeričnega vzorca niso bile spremenjene. Simulirani napetostno-deformacijski odzivi so kvalitativno v skladu z odzivi iz eksperimentalnih študij. V študiji je bilo ugotovljeno, da prožnostni indeks ni odvisen od napetostnih poti. Vrednost b (definirana kot b = (σ2 − σ3)/(σ1 − σ3), kjer je σ1, σ2 oz. σ3 pritisk v smeri x1-, x2- oz. x3) – krivulja osne deformacije – je pri triosnih preizkusih podobna krivulji razmerja napetosti-osne deformacije. Razvoj koordinatnega števila in drseče kontaktne frakcije ni odvisen od smeri napetosti. Opažena je povezava med makro in mikro količinami in edinstveno makro-mikro razmerjem, ne glede na napetostne poti, uporabljene v tej študiji. conventional triaxial compression plane-strain compression micro response DEM geofizika sipki materiali stisljivost metoda ločenih elementov običajna triosna stisljivost ravninsko-deformacijska stisljivost mikro dovzetnost metoda ločenih elementov MLE true false true Angleški jezik Slovenski jezik Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru Znanstveno delo 2018-06-13 11:50:36 2018-06-13 11:51:22 2022-08-01 19:48:42 2019-07-11 18:19:34 2012 0 0 str. 17-23 št. 2 Letn. 9 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1854-0171 550.3:539.58 215987712 270603776 1854-0171 URN:SI:UM:DK:JI7PB5ZH Acta_geotechnica_Slovenica_2012_Sazzad,_Suzuki_A_comparison_between_conventional_triaxial_and_plane-strain_compression_on_a_particulate.pdf Acta_geotechnica_Slovenica_2012_Sazzad,_Suzuki_A_comparison_between_conventional_triaxial_and_plane-strain_compression_on_a_particulate.pdf 1 0E316497EB4C83CE4F018F276F49E3D8 10bd5fb976620782c1ededeacce1ae3fdbaf6ee2087438a5d9430512c1e070ee 06630b1d-7c10-11eb-bb7a-00155d0001ca 20.500.12556/dkum/9995c801-74a4-414b-a970-2731b9b7e5bf https://dk.um.si/Dokument.php?lang=slv&id=125587 http://fgserver3.fg.um.si/journal-ags/2012-2/article-2.asp 1 https://dk.um.si/Dokument.php?lang=slv&id=125588 Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Acta geotechnica Slovenica 0 0 0