ABSTRACT
Since 1995, the Land Transport Authority of Singapore has been constructing and planning the expansion of the underground roads and rails network.
The Thomson-East Coast Line (TEL) is a fully underground Mass Rapid Transit in Singapore that is currently under construction and approximately 43km long with 31 stations connecting the north, to the south and the east coast of Singapore. The construction of the TEL involved the usage of 24 Slurry and 38 Earth Pressure Balance TBMs.
The use of slurry TBMs, selected for rock and mix ground conditions, is an engineering challenge in shallow cover and in soft ground, where there is a higher risk of slurry blowout or spill out to surface. This could result in loss in pressure with very serious consequences. The paper discusses how the usage of High Density has mitigated those risks and elaborates on the slurry mix design, rheological properties and its effectiveness.
