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  Crossing Nee Soon Fault and Springleaf Station (TE4) with Slurry TBM

  The Nee Soon Fault is one of the known faults in Singapore. It strikes in NW-SE direction along the contact between Bukit Timah Granite and Old Alluvium and the younger Kallang Formation. As this few kilometer-long lineament was confined to the granite, it was associated with tectonic uplifting in early Triassic or during the later period of block faulting, reactivated strike-slip movement in early and late Tertiary. The SPPA North-South Cable Tunnel (Mandai to Tagore Drive) intersects the fault from NNW-SSE direction and under-crosses the 200m long LTA Thomson-East Coast MRT Line Springleaf Station (TE4). Due to the launching shaft and station excavations (TE4), faulted ground condition and existence of sensitive structures, it is a challenge in tunnelling for North-South Contract 2 (NS2) Project team. This paper presents not only the geological findings of Nee Soon Fault but also the challenging ground conditions, tunnelling experience and the instrument monitoring results.

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