Time-dependent behaviour of reinforced cuts in weathered flysch rock masses

Mirko Grošić (Avtor), Željko Arbanas (Avtor)

Povzetek

Knowledge of stress-strain rock mass behaviour is crucial for many engineering purposes. Rock mass deformations and their influences on construction are observed during construction and even during exploitation phases. These deformations in the exploitation phase are caused by the time-dependent behaviour of the rock mass. A flysch rock mass is categorised as a heterogenic weak rock that has been intensely subjected to weathering processes. Due to weathering processes, the flysch rock mass degrades from fresh rock to residual soil within only a few meters of the geological profile below the surface. Observations of reinforced cuts along the Adriatic motorway near the City of Rijeka, Croatia, were conducted over a time period of seven years of spanning construction and exploitation. Measured displacements reached significant magnitudes during the exploitation period as a consequence of the time-dependent behaviour of the rock mass. The paper presents findings related to flysch rock mass weathering profile and its characteristics based on detailed geotechnical investigations and monitoring results coupled with back analyses. It was found possible to detect the thickness of the flysch rock mass weathering profile by performing detailed geotechnical investigations. Recommendations for the strength, deformation, and creep properties of the weathering profile of a flysch rock mass are given.

Ključne besede

time-dependent behaviour;weathering;weak rock mass;Burger model;back analyses;

Podatki

Jezik:	Angleški jezik
Leto izida:	2014
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UM FGPA - Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo
UDK:	624.131.25:622.791
COBISS:	280987904
ISSN:	1854-0171
Matična publikacija:	Acta geotechnica Slovenica
Št. ogledov:	688
Št. prenosov:	51
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarni naslov:	Časovno odvisno obnašanje ojačanih zasekov v preperelih flišnih kamnitih masah
Sekundarni povzetek:	Poznavanje napetostno-deformacijskih odnosov kamnitih mas je ključnega pomena za mnoge inženirske probleme. Deformacije kamnitih mas in njihov vpliv na konstrukcijo opazujemo med gradnjo, redko pa med uporabo. Deformacije v fazi uporabe povzroča časovno odvisno obnašanje kamnitih mas. Fliš je opredeljen kot heterogena krhka kamnina, ki je zelo podvržena preperevanju in lahko razpade v zemljino do globine nekaj metrov pod površino. Ojačane zaseke vzdolž Jadranske magistrale v bližini Reke na Hrvaškem smo opazovali sedem let, tako v obdobju gradnje kot uporabe. Izmerjene deformacije so v času uporabe ceste dosegle pomembne velikosti kot posledica časovno odvisnega obnašanja kamnitih mas. V prispevku so predstavljeni rezultati obnašanja preperele flišne mase in njene lastnosti, ki temeljijo na podrobnem geotehničnem raziskovanju in spremljanju rezultatov ter na povratni analizi. Ugotovljeno je, da je globino preperevanja posameznih slojev flišnih mas mogoče ugotoviti s podrobnim geotehniškim raziskovanjem. Podane so priporočene vrednosti parametrov trdnosti, deformabilnosti in polzenja za profil preperevanja flišne kamnite mase.
Sekundarne ključne besede:	geotehnika;kamnite mase;krhke kamnite gmote;fliš;preperevanje;deformacije;
URN:	URN:SI:UM:
Vrsta dela (COBISS):	Znanstveno delo
Strani:	str. 4-17
Letnik:	ǂVol. ǂ11
Zvezek:	ǂ[no.] ǂ1
Čas izdaje:	2014
ID:	10941248