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DIFFERENCES BETWEEN INVESTIGATIONS, DESIGN AND REALITY IN DEWATERING OF ONE OF THE DEEPEST EXCAVATIONS OF SOFIA METRO

AUTHOR/S: I. IVANOV
Sunday 1 August 2010 by Libadmin2007

7th International Scientific Conference - SGEM2007, www.sgem.org, SGEM2007 Conference Proceedings/ ISBN: 954-918181-2, June 11-15, 2007

ABSTRACT/Full article available only in Bulgarian language/

One of the deepest excavations in Sofia history are related to Sofia Metro
Expansion project, in the section between the future Metro Stations 8 (Sofia
University) and 9 (Vasil Levsky Stadium). In this section the metro tunnels
are being driven with the help of a tunnel boring machine delivered by the
Japanese company “Taisei Corporation”.
One of the deepest locations is nearby Vasil Levsky Stadium where the ventilation
shaft is situated. According to the design, the depth of the ventilation shaft is
21 m. The hydrogeological and engineering geological studies indicated that
the groundwater level in this region is at a depth of 4 m, which will cause big
problems in shaft excavation.
All this called for a careful and detailed approach to the design of the water lowering system and its mode of operation. Numeric simulations of the possible
settlements were carried out, involving the filtration consolidation theory as
well.
The present paper considers the problems, which stand after the starting of
excavation works and water-lowering project realization and summarizes the
differences between the investigation results, design of dewatering and reality.
The basic lessons and inferences drawn up in the course of investigations,
design and real dewatering are outlined.

Keywords: Sofia metro, deepest excavation, dewatering, problems.

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