Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)
- 1990.10a
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- Pages.25-34
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- 1990
CONSTRUCTION OF SUBWAY TONNEL BENEATH EXISTING VEHICLE UNDERPASS
Abstract
For the construction of twin single track subway tunnels by NATM within close proximity of existing vehicle underpass in the highly congested area of downtown Seoul, finite element analyses were performed to evaluate the ground responses during tunnelling and also the stability and safety of the underpass structure and subway tunnels. Results of the analyses indicated the need to improve the soil beneath the underpass, and pre-grouting was carried out prior to the tunnel excavation. During tunnel construction field measurement program was implemented to confirm the results of anslyses and to control the tunnel construction procedures, thus ensuring stability of the existing structres.
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