20.500.12556/DKUM-72665 Effect of particle roundness and morphology on the shear failure mechanism of granular soil under strip footing Vpliv zaobljenosti delcev in morfologije na strižni porušni mehanizem zrnatih zemljin pod pasovnimi temelji This study investigates the effect of particles roundness and morphology on the shear failure mechanism of soil. A strip footing was modeled under laboratory conditions. Calcareous soil was tested with three roundness classes: angular, rounded and well-rounded shapes with sizes of 0.30 mm to 4.75 mm. These were divided into six different groups at three relative densities of 30%, 50% and 70%. A series of photographs was taken during the tests and analyzed using the particle image velocimetry (PIV) method to understand the soil-deformation mechanism. The results showed that increasing the sample sizes increased the affected area of the soil. At the same time, increasing the relative density caused a punching failure mechanism that went towards the general failure. The shear failure mechanism of the soil changed from general toward punching shear failure with increasing particle roundness. This effect was larger with the smaller materials. Underneath the affected layers of soil, the angular samples were deeper than the rounded and well-rounded samples. The affected depth in the angular soil was approximately 1.5B in the smallest size group. This was more than 3B and near 4B in the largest size group. Both the sides and the underlying soil layers should be considered on angular soils. The area under the footing becomes more important than the side parts after increasing the roundness of the particles. V članku je raziskovan učinek zaobljenosti delcev in morfologije na strižni porušni mehanizem zrnate zemljine. Pasovni temelj je bil modeliran v laboratorijskih pogojih. Apnenčasta zemljina je bila preizkušena s tremi razredi zaobljenosti zrn: koničasta, zaobljena in dobro zaobljena zrna z velikostmi od 0,30 mm do 4,75 mm. Ti so bili razdeljeni v šest različnih skupin pri treh relativnih gostotah 30 %, 50 % in 70 %. Da bi razumeli mehanizem deformacije zrnate zemljine je bila med preizkusi narejena vrsta fotografij in izvedena analiza z metodo slik sledilnih delcev (PIV). Rezultati so pokazali, da je povečanje velikosti vzorcev povečalo prizadeto območje zemljine. Hkrati pa je povečanje relativne gostote povzročilo prebodni porušitveni mehanizem, ki je prešel proti splošni porušitvi. Mehanizem strižne porušitve zemljine se je spremenil iz splošnega v prebodni porušitveni mehanizem z večanjem zaobljenosti delcev. Ta učinek je bil večji pri manjših drobnejših materialih. Vplivno območje je segalo globlje pri vzorcih s koničastimi zrni kot pri vzorcih z zaobljenimi in dobro zaobljenimi zrni. Ugotovljena globina v zemljini s koničastimi zrni je bila približno 1,5B v najmanjši velikostni skupini medtem, ko je bila več kot 3B in blizu 4B v skupini z največo velikostjo zrn. V zemljinah s koničastimi zrni je treba upoštevati stranske sloje in spodnje sloje zemljin. Območje pod temelji postane pomembnejše od stranskih delov s povečanjem zaobljenosti delcev. particle roundness morphology of particles shear failure mechanism strip footing PIV method ultimate bearing capacity zaobljenost zrn morfologija delcev strižni porušni mehanizem pasovni temelj metoda s sliko sledilnih delcev PIV mejna nosilnost true false true Angleški jezik Slovenski jezik Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru Znanstveno delo 2018-10-11 12:16:35 2018-10-11 12:21:57 2023-07-31 12:24:50 2019-07-11 19:26:32 2018 0 0 str. 43-53 št. 1 Letn. 15 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1854-0171 215987712 305182464 10.18690/actageotechslov.15.1.43-53.2018 1854-0171 URN:SI:UM:DK:O4J9EYWE Acta_geotechnica_slovenica_2018_Ghalehjough,_Akbulut,_Çelik_Effect_of_particle_roundness_and_morphology_on_the_shear_failure_mechanism.pdf Acta_geotechnica_slovenica_2018_Ghalehjough,_Akbulut,_Çelik_Effect_of_particle_roundness_and_morphology_on_the_shear_failure_mechanism.pdf 1 B749FA5D7E08C8B9D850D66485EC4A7E 6c6cc9898c69a6473d9e2470544bc8e525ba2df7517724b3329b4a30dc730b30 78729ffe-7c10-11eb-bb7a-00155d0001ca 20.500.12556/dkum/ecdd803a-875b-41ba-93a4-b4fb6bcb5d5a https://dk.um.si/Dokument.php?lang=slv&id=131020 http://fgserver6.fg.um.si/journal-ags/2018-1/article-4.asp 1 https://dk.um.si/Dokument.php?lang=slv&id=131021 Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Acta geotechnica Slovenica 0 0 0