Geomehanska presoja zanesljivosti zemeljske pregrade v zahtevnih geoloških in seizmičnih pogojih

magistrsko delo na študijskem programu 2. stopnje UM

Sašo Kos (Author), Stanislav Škrabl (Mentor), Borut Macuh (Co-mentor)

Abstract

Zemeljska pregrada predstavlja iz zemljinskih materialov sestavljen stalni ali začasni geotehnični objekt, katerega osnovni namen je zadrževanje vode oziroma dvig njene gladine. Magistrsko delo obravnava pregradni nasip za potrebe akumulacije pri izgradnji ene izmed hidroelektrarn na spodnji Savi, na območju zahtevnih geoloških in seizmičnih razmer. Navedene so osnovne vrste zemeljskih pregrad, opisane njihove glavne značilnosti ter načini gradnje in eksploatacije. Predstavljeni so predpisi za varno načrtovanje velikih pregrad ter ključni parametri statične, dinamične in hidrodinamične stabilnosti, ki zemeljsko pregrado definirajo kot zanesljivo konstrukcijo. Poudarek je na dimenzioniranju prečnega prereza obravnavane konstrukcije v danih geotehničnih pogojih in izboru ter opisu izbranih tehnologij področnega in vertikalnega tesnjenja za preprečevanje vodnih izgub. Dokazana je teza, da je z uporabo primerne mešanice naravnih materialov mogoče zagotoviti zadostno neprepustnost in stabilnost zemeljske pregrade. Predstavljen in terensko preizkušen je do zdaj še neuporabljen način izvedbe stika ploskovne in vertikalne tesnitve, z uporabo neprepustne bentonitne membrane in naknadne izvedbe tesnilne zavese s tehnologijo jet groutinga. Ob interpretaciji rezultatov laboratorijskih oziroma terenskih preiskav in oceni nevarnosti pojava likvifakcije podlage na obravnavanem območju, osrednji del vsebine predstavljajo presoje vodnih izgub ter statične, kvazistatične in dinamične analize stabilnosti ob predloženih projektnih in največjih pričakovanih seizmičnih obremenitvah. V zaključnem delu je predstavljen pomen monitoringa in okviren načrt tehničnega opazovanja velikih pregrad.

Keywords

velike pregrade;vodne izgube;stabilnost;dinamična analiza;likvifakcija;monitoring;magistrske naloge;

Data

Language:	Slovenian
Year of publishing:	2016
Typology:	2.09 - Master's Thesis
Organization:	UM FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
Publisher:	[S. Kos]
UDC:	624.13:627.82(043.2)
COBISS:	19796246
Views:	1542
Downloads:	234
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	GEOMECHANICAL RELIABILITY ASSESSMENT OF THE EARTH EMBANKMENT UNDER DEMANDING GEOLOGIC AND SEISMIC CONDITIONS
Secondary abstract:	An earthfill dam is defined as a permanent or temporary geotechnical facility built out of soil materials, with water retention or water level elevation as its primary function. Master thesis discusses an earth embankment designed for the purpose of creating a water storage reservoir in connection with the construction of a hydropower plant at lower Sava River, where demanding geologic and seismic conditions are present. Basic types of earth dams and their main features are listed here, including methods of construction and exploitation. Regulations for safe large dams design are presented, as well as the crucial parameters of static, dynamic and hydrodynamic stability, which define earth dam as a reliable structure. The emphasis is on the designing of a cross section of the discussed structure in given geotechnical conditions and on the description of selected variations of surface and vertical sealing systems in order to prevent the dam leaking and consequential water losses. It is proved that by using appropriate mixture of natural materials, adequate impermeability and stability of embankment dam can be provided. Thesis features new technology, which has been field tested and encompases, untill today unused, method of implementation at the contact of surface and vertical sealing, using impermeable bentonite membrane and subsequent implementation of grout curtain by jet grouting technology. In addition to interpretation of laboratory and field tests with evaluation of liquefaction occurance hazard, principal part of this thesis consists of water losses assessment in combination with static, pseudostatic and dynamic analysises at given maximal expected and submitted design seismic loadings. Last but not least, an approximate monitoring program of a large embankment dam is presented.
Secondary keywords:	large dam;water losses;stability;dynamic analysis;liquefaction;monitoring;
URN:	URN:SI:UM:
Type (COBISS):	Master's thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za gradbeništvo, prometno inženirstvo in arhitekturo
Pages:	XI, 149 str., [10] str. pril.
ID:	9126750