The Ingenieur Vol 57 January-March 2014 The Ingenieur Vol 57 January-March 2014 | Page 16

INGENIEUR
of the workers and the TBM. The TNB lines that
supply power to the TBM use 33KV which may be
short circuited and post a danger to the workers
in the tunnel. Figure 11, Figure 12 and Figure 13
show the seriousness of ingress water at TBM 1
and TBM 2 respectively.
Rock Spalling/Rock Burst
A rock burst occurrence is a common phenomenon
in deep tunnel excavation in hard rocks with rare

Water Ingress at TBM-2 : Ch. 30,066.8 (TD 95.2m)
Ingress Water 5 m3/min
Ingress Water from TBM hopper

Ingress Water
at Right Wall

Under TBM Bridge Conveyor

Separation of

Sump Pit at Portal

Direct
Discharge

Clean Water
Turbid Water

Figure 12 – Ingress Water at TBM 2

Figure 9 – Measurement of Rock and Water
Temperature in the Tunnel
Figure 13- The Flow of Ingress Water in the Tunnel

Figure 10 – Analysis of Ambient Temperature

Figure 11 – Ingress Water at TBM 1
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VOL 57 JANUARY-MARCH 2014
VOL 55 JUNE 201 ‚