Shallow Tunnelling in urban areas
Some special aspects
ASCE MET 1998
ASCE MET Section Seminary, New York, NY, April 1998
INTRODUCTION
Tunnelling in urban areas with high ground water level requires special care, skill and responsibility! It starts with the design of the underground alignment, its space and shape. This should address not only politics and traffic needs but also geotechnical facts. Long tunnels with one continuous cross-section in uniform ground conditions are competitively bored by today's available machines. It is the changing factor in size and shape not only of the client but also of the structure and the ground conditions that still causes problems, frequently resulting in time and cost overrun.
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