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Geotehnična analiza pokritega vkopa pod nivojem podzemne vode : magistrsko delo št.: 230/II. GR
ID Majnik, Jaka (Avtor), ID Pulko, Boštjan (Mentor) Več o mentorju... Povezava se odpre v novem oknu

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Izvleček
Namen magistrske naloge je geostatična analiza cestnega odseka dolžine 1120 m, ki delno poteka kot pokriti vkop in delno v kesonski izvedbi. Predmet obravnave je del nove cestne povezave od priključka Velenje jug do priključka Slovenj Gradec (2. odsek) na tretji razvojni osi, ki bo potekala od severne proti jugovzhodni Sloveniji (od meje z Avstrijo do meje s Hrvaško). Analiza je zahtevna zaradi visoke podzemne vode, ki je v nekaterih profilih pod arteškim tlakom. S programom Plaxis 2D so bili analizirani štirje različni profili vzdolž trase. Izbrana sta bila dva profila v kesonski izvedbi in dva profila v izvedbi pokritega vkopa. V analizi so bili zajeti vsi ključni elementi in obremenitve. Upoštevani so bili strižni mozniki, ki služijo za povezavo med AB diafragmo in AB konstrukcijo. Med diafragmi in konstrukcijo je bila zaradi neprepustne zasnove konstrukcije dodana nepropustna HDPE membrana. S tem je bilo omogočeno, da voda prosto prehaja na stiku med konstrukcijo in diafragmo. Zaradi omejitve pomikov, notranjih sil v diafragmah in zagotovitve vzgonske varnosti je bilo potrebno upoštevati drenažni sistem, ki služi za znižanje podzemne vode v času gradnje. Nivo drenaž in dolžino diafragem smo določili na prečnem profilu HC-86 in to upoštevali na vseh ostalih profilih. Upoštevane so bile mehanske razpore diafragem, ki so na sredini podprte z globoko temeljeno kovinsko konstrukcijo. Analiza je bila izvedena po fazah gradnje od začetnega stanja do končne zunanje ureditve. Končno stanje predstavlja zasutje nad pokritim vkopom in odstranitev drenaž. Poleg analize in opisa konstrukcije so v magistrski nalogi predstavljeni tudi uporabljeni osnovni postopki kontrol mejnega stanja nosilnosti in uporabnosti po Evrokodih. Prav tako so razloženi različni pojmi, ki se nanašajo na elemente konstrukcije in na postopke analize. V zadnjem delu naloge je bil analiziran optimalen nivo drenaž, kontrolirana porušitev zaradi vzgona ter dimenzioniran premer drenažnih cevi in velikost strižnih moznikov.

Jezik:Slovenski jezik
Ključne besede:gradbeništvo, magistrska dela, GR, pokriti vkop, keson, porušitev zaradi vzgona, hidravlični lom tal, geotehnična analiza, armirano-betonska diafragma, Plaxis 2D, drenažni sistem, uvrtani pilot, strižni moznik
Vrsta gradiva:Magistrsko delo/naloga (mb22)
Tipologija:2.09 - Magistrsko delo
Organizacija:FGG - Fakulteta za gradbeništvo in geodezijo
Leto izida:2022
Založnik:[J. Majnik]
Št. strani:X, 50 str., [8] zganj. pril.
Kraj:Ljubljana
PID:20.500.12556/RUL-140078-a2c4fbf0-966c-e44b-72d4-bd69e9fc7c33 Povezava se odpre v novem oknu
UDK:624.131(043.3)
COBISS.SI-ID:125499395 Povezava se odpre v novem oknu
Datum objave v RUL:10.09.2022
Število ogledov:102
Število prenosov:38
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Sekundarni jezik

Jezik:Angleški jezik
Naslov:Geotechnical analysis of cut and cover tunnel below groundwater level : master thesis no.: 230/II. GR
Izvleček:
The purpose of master's thesis is the analysis of a road section, which is partly constructed as cut and cover tunnel and partly in form of a caisson. The analysis covers the new road section from junction Velenje jug to junction Slovenj Gradec on the third development axis that will establish a road link from the Koroška region to the southeastern part of Slovenia (from Austrian to the Croatian border). The geotechnical analyses of the proposed structures are difficult due to the demanding geotechnical conditions governed by the high groundwater level and low bearing capacity of soils. The groundwater in some parts is even under artesian pressure. The analyses were made with geotechnical software Plaxis 2D. Four different cross sections along the road section were analysed. Two in the form of a cut and cover tunnels version and two in the form of caissons. All essential loads and geometric properties of structures were included in numerical analyses with Plaxis 2D. Even small shear keys were considered. Their purpose is to create a connection between the diaphragm (retaining) wall, which is required to carry out the pit excavation, and final structures. The structures are designed as sealed, using impermeable HDPE membrane as waterproofing, but allowing free flow of water along the contact between the diaphragm and structure walls. During the construction of the structures the drainage system made of round pipes with diameter of 200 mm is necessary to prevent hydraulic failure. The optimal level of drainage pipes and length of diaphragm wall was determined based on the analyses of the critical cross section HC-86 and then adopted for the analyses of other three cross sections. During the excavation process the diaphragm walls are supported with mechanical struts to reduce internal forces and maximum movement of diaphragm walls due to high lateral pressures. The numerical analyses included all construction phases from initial to final state, where the drainage system is terminated. The master's thesis also presents the basic control procedures for hydraulic failures according to Eurocodes. Various terms related to construction elements and analyses procedures are also explained. Various controls, analyses and dimensioning of structural elements are presented in the last part. The optimal drainage level was analysed in the order to prevent hydraulic failure and the essential elements of structure, drainage pipes and shear keys were dimensioned.

Ključne besede:civil engineering, master thesis, cut and cover tunnel, caisson, reinforced-concrete diaphragm wall, Plaxis 2D, failure by uplift, failure by heave, drainage system, auger drilling, short shear console, geotechnical analysis

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