The first tunnel boring machine (TBM) for the Thomson Line has commenced mining works at the Tagore site. An issue with the TBM's internal electrical systems delayed the inaugural tunnelling by several weeks. Nonetheless, the achievement of this significant milestone is one to be joyous among the Leighton-John Holland & NFM team.
The TBM has started the drive on the Woodlands Bound tunnel towards the Lentor Station. The geological conditions along the tunnel route consist mostly of residual soil of the Bukit Timah Granite (Grade VI), with minimal occasions of fill along the crown and weathered granite along the bench and invert. The excavation works should take around 11 months to complete, varying on the progress of the tunnel drive.
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| TEL1/2 Tunnel Chart, August 26 2015 |
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| TBM1 (right) in launching position at end July - NFM Technologies |
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| TBM2 & TBM1 this month - John Holland |
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