Numerical study of the dynamic active lateral earth pressure coefficient of cohesive soils

Abstract

Retaining walls are proposed in many projects, such as bridges, coastal structures, road constructions and wherever lateral support is required for the vertical surface of an excavation. The active lateral pressure coefficient of soil, Ka , is an important parameter for studying the static and dynamic behaviors of these retaining walls. Many studies have evaluated this coefficient in static situations, but in most previous dynamic studies, researchers have worked on the behavior of cohesionless backfill soil or made simplifying assumptions (e.g., pseudo-static status) for cohesive soils as backfill soil. In this study, the size of the active lateral earth pressure coefficient (Ka) was studied in a full dynamic situation (Kae). A retaining wall with cohesive backfill soil is evaluated using the finite-difference method (FDM) and the effects of important soil and loading properties are assessed. The model is based on Mohr-Coulomb failure criteria under seismic loading. The results show that the value of Kae at the top of the wall, where it is highly sensitive to any variation in the soil and loading properties, is greater than one due to the high pressure value induced by the horizontal dynamic acceleration and the presence of tension cracks.

Keywords

dynamic active lateral earth pressure coefficient (Kae);cohesive backfill soil;finite difference method (FDM);tension cracks;retaining wall;seismic loading;

Data

Language:	English
Year of publishing:	2017
Typology:	1.01 - Original Scientific Article
Organization:	UM FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
UDC:	624.13
COBISS:	302988288
ISSN:	1854-0171
Parent publication:	Acta geotechnica Slovenica
Views:	1139
Downloads:	86
Average score:	0 (0 votes)
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Other data

Secondary language:	Slovenian
Secondary title:	Numerična študija koeficienta dinamičnega aktivnega zemeljskega tlaka za kohezivne zemljine
Secondary abstract:	Podporni zidovi so predlagani v mnogih projektih, kot so mostovi, priobalne konstrukcije, cestne konstrukcije in v primerih, ko je potrebno bočno podpiranje izkopov vertikalnih površin. Koeficient aktivnega zemeljskega tlaka Ka , predstavlja pomemben parameter pri študiju statičnega in dinamičnega obnašanja podpornih zidov. Mnoge študije obravnavajo ta koeficient v statičnih pogojih, v mnogih predhodnih dinamičnih študijah so raziskovalci obravnavali obnašanje nekohezivne zaledne zemljine ali pa so naredili poenostavljene predpostavke za kohezivne zaledne zemljine (npr.: psevdo statični pogoji). V tej študiji je bila preučevana vrednost koeficienta aktivnega zemeljskega tlaka (Ka) v polni dinamični situaciji (Kae). Podporni zid s kohezivno zaledno zemljino je preučevan z uporabo metode končnih diferenc (FDM), upoštevani so vplivi pomembnih lastnosti zemljine in obtežb. Model je zasnovan z Mohr-Coulomb modelom kriterija porušitve pri seizmični obtežbi. Rezultati kažejo, da je vrednost koeficienta Kae na vrhu zidu, kjer je zelo občutljiv na kakršno koli spremembo lastnosti zemljine in obtežbe, večja od vrednosti koeficienta Kae zaradi visoke vrednosti tlaka povzročenega s horizontalnim dinamičnim pospeškom in prisotnostjo nateznih razpok.
Secondary keywords:	geotehnika;podporni zidovi;kohezivne zemljine;koeficient dinamičnega aktivnega zemeljskega tlaka;
URN:	URN:SI:UM:
Type (COBISS):	Scientific work
Pages:	str. 74-87
Volume:	ǂVol. ǂ14
Issue:	ǂ[no.] ǂ1
Chronology:	2017
ID:	10941826