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DIFFERENCES BETWEEN INVESTIGATIONS, DESIGN AND REALITY IN DEWATERING OF ONE OF THE DEEPEST EXCAVATIONS OF SOFIA METRO
Abstract
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.
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References2
Антонов Хр., “Подземни води в България”, С., Т ехника, 1981 Гълъбов М., “Динамика на подземните води”, С., Техника, 1981 Лилов, Л. Отчет по тема “Баланс на подземните води в Софийската депресия. Определяне на експлоатационния разход с оглед съставяне на баланса и изготвяне на дългосрочна програма за рационално проучване и използане на подземните води”, София, НГФ V -458, 1996 Ivanov I., L.
Mihova, Study of Soil Deformations Caused by the Discharge of Groundwater in Case of Different Geological Structure, Proc. XIII ECSMGE, Prague, 2003.
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