Geotechnical Consideration Regarding The
Routing Of Twin Railway Tunnels Across The
Karoun River
Author(s)
B. Esmaeili, A. A. Safikhani & A. A. Amiri Samani
Abstract
Ahwaz city is located in the Khoozestan Province, a floodplain, almost flat area
on the south western margin of the Zagros mountain range, well known by its
giant oil fields. The four main geological phenomena of this area are: the Ahwaz
fault, the Ahwaz anticline, the Aghajari formation and the alluvium deposits of
Quaternary. Karoun, the biggest river of Iran, runs through this city. The Ahwaz
Urban Railway Project was started in 2006 (the engineering, procurement and
construction (EPC) contractor is Kayson Company). About 100 bore holes were
drilled along the project, and the main problem was how to cross the river. Due
to the city condition (streets, buildings...) the tunnels should pass under the river,
but where and at what depth is the question. The agglomeration of people and
transportation system were dictated by the zone of river crossing but in order to
find the exact location and depth of the tunnels, complete studies were
undertaken.
1 Introduction
Ahwaz city is located in the south west of Iran as the centre of the Khuzestan
Province with a population of about 2 million. The Ahwaz Urban Railway
Project consists of a 24-kilometre parallel twin tunnel with a 6 metre final radius
and 24 stations. The project level is -17.5m from the surface, except for the
crossing with the Karoun River (the tunnels crossing under the Karoun River at a
lower elevation) and the water level is about -2 m from the surface [1]. Twin
tunnels would be drilled by a tunnel boring machine (TBM). Therefore, some
boreholes with a complete set of laboratory and field tests were drilled on the
Keywords
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