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| Application of new Austrian tunnelling method to a large span trinocular cross section tunnel |
| Tim LEUNG1，CHEN Jinhui2 |
| (1. AECOM Asia Co.，Ltd.，Hong Kong 999077，China；2. China State Construction International Investment(China) Limited，Shenzhen，Guangdong 518000，China) |
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Abstract The Central-Wan Chai Bypass(CWB) is a route to reduce the traffic congestion between the east and west of the densely populated Island metropolis. This paper is to review the performance of design and construction of the underground tunnel with trinocular cross section area of 460 m2 and a combined span of 50 m by sequential excavation method(SEM) in hard rock and adopting the new austrian tunneling method(NATM)，together with the application of NGI Q-system allowing observational approach and optimization of temporary rock support design. The trinocular tunnel also passes 20 m beneath the southern approach ramp of the Cross-Harbour tunnel(CHT). Furthermore，the comprehensive application of several engineering measures，such as the extensive instrumentation monitoring，standby dewatering/recharging system and steel weights，to reduce the risk of flotation of the existing CHT are also discussed in this paper.
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2017, Vol. 36 
