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Title:A 3D nonlinear dynamic analysis of a rock-fill dam based on IZIIS software
Authors:Mircevska, Violeta (Author)
Bickovski, Vladimir (Author)
Garevski, Mihail (Author)
Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru (Authorship owner)
Files:.pdf Acta_geotechnica_Slovenica_2007_Mircevska,_Bickovski,_Garevski_A_3D_nonlinear_dynamic_analysis_of_a_rock-fill_dam_based_on_IZIIS_softwar.pdf (923,69 KB)
MD5: 8F70410AF6C85B1BEBFE132913CA1969
 
URL http://fgserver3.fg.um.si/journal-ags/2007-2/clanek-2.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 paper treats the 3D nonlinear dynamic behavior of a rock-fill dam based on the Mohr-Coulomb failure criterion. The dam is situated in a steep, narrow, “V-shaped” rigid canyon. The concept of a massless rock foundation is treated, for which a certain part of the rock is included in the model. The dam-rock interface was modeled by contact elements, which allowed certain relative displacements between the two media of different stiffnesses. The generation of the 3D mathematical model was related to the topology of the terrain, and the nonlinear dynamic response was based on the "step-by-step" linear-acceleration direct-integration method, making use of the Wilson-θ method. The convergence process was in accordance with the Newton-Raphson method. First, the initial static effective stresses existing in the conditions of the established stationary filtration through the clayey core were defined. The analysis was based on an original FE program for the static and dynamic analyses of rock-fill dams, as well as a FE program for the solution of the stationary filtration process through the clayey core. The dynamic response of the 3D model of the dam was defined for the effect of harmonic excitations. Dynamic analyses in the linear and nonlinear domains were performed for the purpose of comparing the results. The time histories of the linear and nonlinear responses were defined for selected sections and nodes of the model, the tension cut-off zones, the plastic deformations, and the stress-shear strain relationships. The coefficient against the sliding of the potential sliding surfaces was also defined. It can be concluded that 3D analyses as well as a nonlinear material treatment of the soils built in the dam are imperative for a proper assessment of the stability of rock-fill dams situated in narrow canyons.
Keywords:automatic generation of 3D model, rock-fill dam, nonlinear dynamic analysis, elastic perfectly plastic criterion, tension cutoff, cracking zones, plastic deformations, stability
Year of publishing:2007
Number of pages:str. 16-32
Numbering:št. 2, Letn. 4
ISSN:1854-0171
UDC:624.131:55
ISSN on article:1854-0171
COBISS_ID:246142208 New window
NUK URN:URN:SI:UM:DK:NCA6ZLBX
Copyright:Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru
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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:3D nelinearna dinamična analiza kamnite pregrade, ki temelji na IZIIS softwaru
Abstract:V tem prispevku je opisano 3D nelinearno dinamično obnašanje kamnite pregrade. Za kamnito maso je upoštevan material, ki zadovoljuje Mohr-Coulombov kriterij porušitve. Pregrada se nahaja v strmem, ozkem, ostrem kanjonu, v obliki črke 'V'. Obravnavan je koncept modela »brezmasnega kamnitega temelja«, pri čemer je določen del kamnine vključen v model. Kontaktna ploskev med kamnino in pregrado je modelirana s kontaktnimi elementi, ki omogočajo relativne premike med materialoma različne togosti. 3D matematičnega modela je bil izbran glede na topologijo terena. Nelinearni dinamični odziv temelji na direktni integracijski metodi linearnega pospeška, kis e izvaja 'korak za korakom' z uporabo metode Wilson-θ. Konvergentni postopek je v skladu z Newton-Raphsonovo metodo. Najprej so bile določene začetne statične efektivne napetosti, ki so v stacionarnih pogojih filtracije skozi glinasto jedro. Analiza temelji na originalnem programu s končnimi elementi za statično in dinamično analizo kamnitih pregrad, kakor tudi na programu s končnimi elementi za reševanje stacionarnih filtracijskih procesov skozi glinasto jedro. Dinamični rezultat 3D modela pregrade je definiran za efekt harmoničnih indukcij. Dinamične analize v linearni in nelinearni domeni so bile izvedene zaradi primerjave rezultatov. Časovni poteki linearnih in nelinearnih odzivov so bili določeni za izbrane odseke in točke modela, natezne razpoke, plastične deformacije in napetostno deformacijske odnose. Določili smo tudi koeficient varnosti potencialnih drsnih površin. Ugotavljamo, da so 3D analize, kakor tudi nelinearno obravnavanje materialov vgrajenih v pregrado, nujne za pravilno oceno stabilnosti kamnitih pregrad izvedenih v ozkih kanjonih.
Keywords:geomehanika, pregrade, kanjoni, kamnine, modeli, dinamična analiza, avtomatsko generiranje 3D modela, kamnita pregrada, nelinearna dinamična analiza, elasto plastični kriterij, natezna razpoka, cone z razpokami, plastične deformacije, stabilnost


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  1. Acta geotechnica Slovenica

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