gi predavanja2
DESCRIPTION
Potporne KonstrukcijeTRANSCRIPT
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Predmet: Geotehničko Inženjerstvo
Predavanje 2: Potporne Konstrukcije
Gradjevinski fakultet
Univerzitet u Sarajevu
Faculty of Civil Engineering
University of Sarajevo
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Literatura
OBAVEZNA:
Predavanja PDF format
DODATNA:
Braja M. Das: Principles of Foundation Engineering
(6th edition)
Muni Budhu: Soil Mechanics and Foundation
Robert W. Day: Foundation Engineering Handbook
(2nd edition)
Donald P. Coduto: Foundation Design, Principles
and Practices (2nd Edition)
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2. Potporne Konstrukcije (Sadržaj)
2.1 Uvod - Pritisci Tla
2.2 Uticaj Kompaktiranja Tla
2.3 Tipične Potporne Konstrukcije
2.4 Tipične Dimenzije Gravitacionih i Konzolnih Zidova
2.5 Vrste Sloma
2.5.1 Nosivost Tla
2.5.2 Prevrtanje
2.5.3 Klizanje
2.5.4 Generalna Stabilnost
2.6 Armiranje Potpornih Zidova
2.7 Drenaža
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2. Potporne Konstrukcije (Sadržaj)
2.8 Armirano Tlo –Zid sa Elementima i Armiranje Trakom
2.8.1 Uvod
2.8.2 Proračun Armaturnih Traka
2.8.3 Kontrola Protiv Nožnog Sloma
2.9 Armirano Tlo –Zid sa Elementima i Armiranje Geotextilom
2.9.1 Uvod
2.9.2 Prevrtanje
2.9.3 Klizanje
2.9.4 Generalna Stabilnost
2.10 Gabioni
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2. Potporne Konstrukcije (Sadržaj)
2.11 Zaštita Građevinskih Jama i Dubokih Zasjeka
2.11.1 Sistemi
2.11.2 Tipovi Potpornih Zidova (Građevinske Jame)
2.11.3 Zid sa Jednom Zategom
2.11.4 Proračun Zida sa Jednom Zategom
2.11.5 Sidrenje
2.11.6 Generalna Stabilnost Sidrenog Zida
2.11.7 Sile u Razuporama
2.11.8 Slijeganje u Zaleđu Bokova Građevinske Jame
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2.1 Uvod – Pritisci Tla
Ponoviti gradivo iz predmeta Mehanika
Tla i Stijena I, predavanje MTIS-5,
slajdovi 13-40 o pritiscima tla:
Pritisak mirovanja
Aktivni pritisak
Pasivni pritisak
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2.1 Uvod – Pritisci Tla
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2.1 Uvod – Pritisci Tla
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2.1 Uvod – Pritisci Tla
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2.2 Uticaj Kompaktiranja Tla
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2.2 Uticaj Kompaktiranja Tla
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2.2 Uticaj Kompaktiranja Tla
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2.2 Uticaj Kompaktiranja Tla
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2.2 Uticaj Kompaktiranja Tla
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2.3 Tipične Potporne Konstrukcije
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2.3 Tipične Potporne Konstrukcije
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2.3 Tipične Potporne Konstrukcije
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2.4 Tipične Dimenzije Gravitacionih i
Konzolnih Zidova
B = (0.5-0.7) H
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2.4 Tipične Dimenzije Gravitacionih i
Konzolnih Zidova
B = (0.4-0.7) H
d = H/10 – H/12
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2.5 Vrste Sloma
Do loma potporne konstrukcije može
doći na jedan od sledećih načina:
Prevrtanjem
Prekoračenjem nosivosti tla
Klizanjem
Ugrožavanjem generalne stailnosti
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2.5 Vrste Sloma
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2.5 Vrste Sloma
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2.5.1 Nosivost Tla
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2.5.1 Nosivost Tla (Uticaj Kose Sile i Ekscentriciteta)
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2.5.1 Nosivost Tla (Uticaj Kose Sile i Ekscentriciteta)
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2.5.2 Prevrtanje
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2.5.2 Prevrtanje
Rankin:
212
2p p pP K D c K D
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2.5.2 Prevrtanje
Momenti Otpora
Fs
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2.5.3 Klizanje
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2.5.3 Klizanje
Ako je klizanje problem potporne konstrukcije
rješava se lokalnim produbljivanjem
(“moždanikom)
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2.5.4 Generalna Stabilnost
Ponoviti gradivo iz predmeta Mehanika
Tla i Stijena I, predavanje MTIS-DIO 6,
Stabilnost Kosina
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2.6 Armiranje Potpornih Zidova
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2.6 Armiranje Potpornih Zidova
(Tipični slom konzolnog zida)
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2.6 Armiranje Potpornih Zidova
(Zid sa kontraforima)
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2.7 Drenaža
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2.7 Drenaža
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2.7 Drenaža
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2.8 Armirano Tlo –Zid sa Elementima
i Armiranje Trakom
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2.8.1 Uvod
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2.8.1 Uvod
45+/2
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2.8.2 Proračun Armaturnih Traka
n
n
dop
TA
Potrebni presjek zatege
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2.8.3 Kontrola Protiv Nožnog Sloma
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2.9 Armirano Tlo –Zid sa Elementima
i Armiranje Geotextilom
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2.9 Armirano Tlo –Zid sa Elementima
i Armiranje Geotextilom
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2.9.1 Uvod
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2.9.1 Uvod
U kliznoj plohi na dubini Dn, odupiru se Tn i donja zatega, jer su gornje zatege u kliznoj masi!
n n m n
s
an
n n m
D L tg TF
P
T B D tg
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2.9.2 Prevrtanje
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2.9.3 Klizanje
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2.9.4 Generalna Stabilnost
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2.10 Gabioni
Gabion – “Kavez” od čelične žice zaštićene cinčanjem ili
plastičnim UV optornim slojem popunjeni lomljenim
slaganim kamenom
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2.10 Gabioni
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2.10 Gabioni
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2.11 Zaštita Građevinskih Jama i
Dubokih Zasjeka
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2.11.1 Sistemi
(Konzolni Zid)
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2.11.1 Sistemi
(Sidreni Zid)
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2.11.1 Sistemi
(Sidreni Zid)
Sidrena Ploča
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2.11.1 Sistemi
(Razuprta Stijena)
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2.11.2 Tipovi Potpornih Zidova
(Građevinske Jame)
Talpe – drvene ili armirano betonske. Zabijanje sa maljem ili
dizel čekićom a može i vibro glavom
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2.11.2 Tipovi Potpornih Zidova
(Građevinske Jame)
Čelični profilisani limovi (žmurje) – Zabijanje dizel
čekićem ili vibro glavom.
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2.11.2 Tipovi Potpornih Zidova
(Građevinske Jame)
Berlinski Zid
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2.11.2 Tipovi Potpornih Zidova
(Građevinske Jame)
Zid od bušenih šipova (pilota) koji se dodiruju. Od istih
se može radati i “Berlinski Zid”
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2.11.2 Tipovi Potpornih Zidova
(Građevinske Jame)
Zid od zasječenih šipova (pilota) koji se dodiruju
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2.11.2 Tipovi Potpornih Zidova
(Građevinske Jame)
Armirano betonske dijafragme
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2.11.2 Tipovi Potpornih Zidova
(Građevinske Jame)
Redoslijed izrade AB dijafragme
Iskop baznog panela pod zaštitom isplake
Stalno reciklirati i pročišćavati isplaku (“de sander”)
Uložiti armaturni koš
Betoniranje baznog panela postupkom podvodnog
betoniranja
Slijedi iskop, armiranje i betoniranje veznog panela
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AB Dijafragme
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AB Dijafragme
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AB Dijafragme
Isplaka - Suspenzija Bentonitne gline (Montmorinolita),
Barita ili Barium Sulfata
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AB Dijafragme
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AB Dijafragme
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2.11.3 Zid sa Jednom Zategom
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2.11.3 Zid sa Jednom Zategom
“Modeli” Sloma
Slom Zida
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2.11.4 Proračun Zida sa Jednom Zategom
Prvo proračunati strujnu mrežu
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2.11.4 Proračun Zida sa Jednom Zategom
Odredi “t” tako da ne dolazi do hidrauličkog sloma tla
(“piping” = engl.)
Odredi hidrodinamičke pritiske vode
Slučaj Pregrade
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2.11.4 Proračun Zida sa Jednom Zategom
Odredi g”
Odredi aktivne pritiske
Odredi moguće pasivne otpore za razne dubine ̅t
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2.11.4 Proračun Zida sa Jednom Zategom
1.5
2.0
p p
s
a a
P aF
P a
Izračunati potrebnu dubinu zida (ispod nivoa iskopa)
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2.11.4 Proračun Zida sa Jednom Zategom
Izračunati potrebnu dubinu zida (ispod nivoa iskopa)
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2.11.4 Proračun Zida sa Jednom Zategom
Odrediti unutrašnje sile u zidu i silu u zategi
Dodatna kontrola
(numerika):
Zatega: z
z
dop
RA
,p moguce
s
T
PF
R
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2.11.4 Proračun Zida sa Jednom Zategom
(Uticaj Elastičnosti Zatege)
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2.11.5 Sidrenje
(Tipovi)
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2.11.5 Sidrenje
(Tipovi)
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2.11.5 Sidrenje
(Tipovi)
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2.11.5 Sidrenje
(Tipovi)
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2.11.5 Sidrenje
(Tipovi)
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2.11.5 Sidrenje
(Sidrišni Šipovi-Piloti)
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2.11.5 Sidrenje
(Sidrišni Ploča)
Pijesak
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2.11.5 Sidrenje
(Sidrišni Ploča)
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2.11.5 Sidrenje (Sila Čupanja Sidrišne Ploče u Glini)
Dopušteno: Hdop = F / Fs
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2.11.6 Generalna Stabilnost Sidrenog Zida
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2.11.7 Sile u Razuporama
(Mehanika Tla i Stijena I)
Pijesak Meka Glina Kruta Glina
Peck-ovi empirički dijagrami za višestruko razuprte usjeke
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2.11.7 Sile u Razuporama
(Mehanika Tla i Stijena I)
Primjer razuprtog usjeka
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2.11.8 Slijeganje u Zaleđu Bokova
Građevinske Jame
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2.11.8 Slijeganje u Zaleđu Bokova
Građevinske Jame