Abstract
Fifteen years ago construction started on phase one of the Mass Rapid Transit tunnels in Singapore. Since that time tunnelling technology has advanced considerably. Earth Pressure Balance Machines (EPBMs) are far more commonly used than ever before on tunnelling projects in the Far East, Asia and Europe. For the first time in Singapore full-face tunnelling is being carried out in the Old Alluvium for the construction of North East Line Project (NELP). The TBMs selected for the NELP are, in the main, EPBMs. This paper compares the types of EPBMs chosen for each Contract, highlighting the particular design features of each. The paper also provides an update on the progress of the EPBM tunnelling operations currently being undertaken on the NELP.
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