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Title:Effect of particle roundness and morphology on the shear failure mechanism of granular soil under strip footing
Authors:ID Ghalehjough, Babak Karimi (Author)
ID Akbulut, Suat (Author)
ID Çelik, Semet (Author)
ID Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru (Authorship owner)
Files:.pdf Acta_geotechnica_slovenica_2018_Ghalehjough,_Akbulut,_Çelik_Effect_of_particle_roundness_and_morphology_on_the_shear_failure_mechanism.pdf (701,47 KB)
MD5: B749FA5D7E08C8B9D850D66485EC4A7E
PID: 20.500.12556/dkum/ecdd803a-875b-41ba-93a4-b4fb6bcb5d5a
 
URL http://fgserver6.fg.um.si/journal-ags/2018-1/article-4.asp
 
Language:English
Work type:Scientific work (r2)
Typology:1.01 - Original Scientific Article
Organization:FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
Abstract: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.
Keywords:particle roundness, morphology of particles, shear failure mechanism, strip footing, PIV method, ultimate bearing capacity
Year of publishing:2018
Publication status in journal:Published
Article version:Publisher's version of article
Number of pages:str. 43-53
Numbering:Letn. 15, št. 1
PID:20.500.12556/DKUM-72665 New window
ISSN:1854-0171
ISSN on article:1854-0171
DOI:10.18690/actageotechslov.15.1.43-53.2018 New window
NUK URN:URN:SI:UM:DK:O4J9EYWE
Copyright:Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru
Publication date in DKUM:11.10.2018
Views:1107
Downloads:403
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Categories:Misc.
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Record is a part of a journal

Title:Acta geotechnica Slovenica
Shortened title:Acta geotech. Slov.
Publisher:Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru
ISSN:1854-0171
COBISS.SI-ID:215987712 New window

Secondary language

Language:Slovenian
Title:Vpliv zaobljenosti delcev in morfologije na strižni porušni mehanizem zrnatih zemljin pod pasovnimi temelji
Abstract: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.
Keywords:zaobljenost zrn, morfologija delcev, strižni porušni mehanizem, pasovni temelj, metoda s sliko sledilnih delcev PIV, mejna nosilnost


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