چکیده مقاله
Regarding urban development, metro tunnels are increasingly being excavated in soft ground conditions In metro tunnel excavations, it is important to control surface settlements observed before and after excavation, which may cause damage to surface structures Construction of tunnels induces a state of strain in the soil around the excavation that could cause damaging differential displacements in existing structures near the tunnel This paper reports the results of a study carried out to estimate the values of the surface settlements induced by the excavation of twin tunnels, which have been excavated between the Otogar and Kirazlı stations of the Istanbul Metro line namely a length of 5 77 km Authors of the paper have not carried out field studies at the tunnel; data related to tunnel were taken from Mahmutoğlu 2010 , Ocak 2009 and Ercelebi et al 2010 In this paper only numerical modeling has been performed on obtained data In particular, the purpose of this study has been to compare the vertical surface displacements monitored during the advancing excavation and the settlements estimated by using 3D Finite Difference model For numerical analyses, FLAC3D program is used Geology in the study area is composed of fill, stiff clay and dense sand and hard clay Tunnels are excavated by using two Earth Pressure Balance Tunnel Boring Machines with a 6 5 m diameter as twin tubes with 14 m distance from center to center Ground settlement results obtained by numerical modeling are in good agreement with field measurements
کلیدواژهها
نویسندگان
Hamid Chakeri
Phd student, Hacettepe University, Dept of Mining Engineering, Beytepe, ۰۶۸۰۰ Ankara, Turkey
Bahtiyar Ünver
Professor, Hacettepe University, Dept of Mining Engineering, Beytepe, ۰۶۸۰۰ Ankara, Turkey
Alireza Talebinejad
University of Tehran, Dept of Mining Engineering, Tehran, Iran
شیوه ارجاع
Chakeri, Hamid and Ünver, Bahtiyar and Talebinejad, Alireza,1390,Control of surface settlements with Earth pressure balance method (EPB) for Istanbul metro,09th Iranian Tunneling Conference,Tehran
ارائهشده در
مجموعه مقالات نهمین همایش ملی تونل10 آبان 1390 · تهران