Finite Element Analysis of a Deep Excavation: A Case Study

China European Conference on Geotechnical Engineering, Vienna, Avusturya, 13 - 16 Ağustos 2018, cilt.2, sa.7, ss.885-888

world popı_ılation increases clay by day. In order to meet this increasing

poprılation,s basic needs srıch as slreltering, transportatıon aıd sociai actjvities,

necessityforundergroı-ındstrrıctı-ıresgracluallyincrease.Asarestılt,deel-ıexcava.

tions becr)me more in1portanı eaclr passing day while excavations deepen. ln order

to design the optimum iystem which ensrıres tlre safety of environment, roads, strrıc_

trıres and the excavation, the excavation properties shoııtd be modelled so that it

reflects the actual geometry andboı_urdary conditions. The ground paraıneters, wl,ıich

have cnıcial etl,ect on the solution, should also be determiı]ed precisely. In this study,

adeepexcavationwithadepthof33.0mperforıneclonover.consolidatedAnkara

clay is investigatec]. The excavation system was designed to be consisted of dolıblc_

row of piies supported by mı"ıltilevel anclrors. Inclinoııeter and load cell installa_

tions on the shoring elements have been made for tlıe inspection of tlre pile wall

displacements arıd anchor forces. Back analysis is ınade in order to obtain tlre ideal

ground parameters which give the measrıred clisplaceıneırts and anchor forces. This

analysis is conductec] by a series of plaxis analysis in rvlrich ground pararrreters are

changed iteratively in order to 1ind their values tlrat give the measrıred displace_

ments and forces. For these Plaxis analyses, three difl'erent models naınely; Hard_

ening soil, Hs small and Mohr coulonrb are used and grolıııc,l paraıneters are deter_

mined. Finally, groı.ınd paıameters obtalned by back aı-ıalvsis for ditferent soi1

models and the parameters determined from fieid tests are coııpared ancl a correla_

tion is proposecl to Simulate the belravior of over cons..ılidated Ankara clay.