Page 23 - index

TunnelsWorldwide

3.3
1

2

3

4

3A

3A

3
4 3A

3A 0 5
2A 0.4 50
A 0.8
B 0.9
S 1
2

1 4

= 1
5
n S n B n A n 2A n 3A
S,B,2A,3A
3.4
1 4
4 4.1

50 0.5
50

IssueNo.5 2013 ShieldTunnellingTechnology 19