Tunnel
Tunnel
Tunnel
MOUNTAINTUNNELS
FORESTTUNNELS
URBANTUNNELS
25
20
15
10
5
0
15
10
5
0
Factor for reduction of
inflow to tunnel
Factor 100 Factor 50 Factor 30 Factor 10
Thickness of the sealed zone
GN cover:december2012
Our final
issue
1982 - 2019
Volume 37 • Number 4 • December 2019
37
GEOTECHNICAL
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2019
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