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COMPANY NEWS SELI to complete troubled TBM drive in China Jun 2011
SELI News Release
SELI has signed a contract worth about €20 million to complete a troubled TBM tunnel in the People's Republic of China. Located in Taibai County of Shaanxi Province, the tunnel is part of the Yinhongjishi Water Diversion Project. The 19.8km tunnel is constructed by drill+blast and and TBM methods. Up to the present, about 6km of the TBM tunnel section has been excavated with the remaining 5.1km is to be completed.
Portal to the stuck TBM drive

Portal to the stuck TBM drive

Following various works delays due to the severe ground conditions, the client awarded the contract for completing the tunnel to SELI as a specialized tunnelling company. The contract requires modification of the TBM to cope more effectively with challenging geological conditions.
Work on the project started some time ago and where the headings of the 8.7km of drill+blast work are to reach final breakthrough later this month, operation of the TBM by the local contractor has been severely hampered by several fault zones and through difficult waterbearing ground conditions.
SELI's proposal to complete the troubled drive comprises three phases: to design and build a tunnel enlargement to allow for recover of the Robbins double shield machine; modification and refurbishment of the TBM and its back-up to cope better with the hydro-geological difficulties; and to advance using the new tunnelling methods to complete the remaining 5.1km of the tough TBM operation.
Since 1989 SELI has completed several successful TBM tunnels in the People's Republic of China. Among them are the general main drives of the Yellow River Diversion Project (a total of 21.4km in 1993/1999); the Wanjiazhai Yellow River Diversion Project (a total 86.9km in 1998/2001); and the Xinjiang Daban Diversion Tunnel Project (a total of 19.7km in 2005-2007). Ultimate completion of the TBM drive for the Yinhongjishi Water Diversion Project will add to the company's China experiences.
References
Record setting TBMs on Yellow River drives - TunnelTalk, Jan 2001

           

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