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Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
Figure 8. Air-lock of compressed-air operation for cross passage
excavation.
Figure 9. Octagonal steel-beam reinforcement inside tunnel.
cross passage for lot CD266 of Taipei MRT is introduced. For
this project, the excavation zone at the bottom of the drainage
sump must be able to resist 26.7 m of pressure head. Under the
challenge of this immense groundwater pressure, any crack in
the improved ground might cause water and soil to flow into the
excavation zone; carry away ground materials near the cross
passage, damage the completed main tunnels, and result in
exceedingly serious consequences.
It should be noted that the ground conditions encountered at
great depths could be quite complicated. The geotechnical
Figure 10. Steel safety-gates at the end of cross passage.
engineer should never overestimate the effects of jet grouting
and chemical grouting. Under the threat of the tremendous
groundwater pressure, to keep the construction on the safe side,
it is suggested to maintain a cautious attitude and take
conservative measures. When facing potential underground
hazards, to reduce the risk of construction, the designer is
Defense” concept.
nformation and support. The kind
assistance of Sinotech Engineering Consultants, Ltd. is also
Conti
hen Line construction lot CD266,
Fang
ng for shield
Fang
properties of
Fang
1994a. Mechanical
Fang
b. An empirical
Fang
grouted soilcrete for Taipei MRT
Sino
an area MRT systems, Tu-chen Line design lot
DD188, geological exploration and soil testing report. (in
Chinese)
suggested to adopt the “Multiple Lines of
6 ACKNOWLEDGEMENTS
The authors wish to thank the Central District Project Office,
Department of Rapid Transit Systems, Taipei City Government,
for providing valuable i
gratefully acknowledged.
7 REFERENCES
nental Engineering Corp. 2003. Taipei metropolitan area
MRT systems, Tu-c
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tech Engineering Consultants, Ltd. 1992. Taipei
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