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New Horizontal Pre-Drainage System in Subsea Tunnelling  

Hong, Eun-Soo (한국지질자원연구원 지반안전연구부)
Shin, Hee-Soon (한국지질자원연구원 지반안전연구부)
Park, Chan (한국지질자원연구원 지반안전연구부)
Kim, Hyung-Mok (한국지질자원연구원 지반안전연구부)
Park, Eui-Seob (한국지질자원연구원 지반안전연구부)
Publication Information
Tunnel and Underground Space / v.18, no.1, 2008 , pp. 10-19 More about this Journal
Abstract
Most of flooding cases in tunnels are associated with huge inrushes of water due to the fracture zone with very high water head. To find out the causes and countermeasures for flooding cases, a dozen of tunneling cases are studied. Case studies presented here show that if the flooding had been forecasted and pre-drained prior to the tunnel excavation, such accidents could have been prevented. From this observation, we suggest a new horizontal drainage system with pre-investigation and pre-drainage concept. Seepage analyses are performed to analyze the water head reduction effect on the tunnel face by drainage pipes during the construction of subsea tunnels. Drainage system analyses are performed to analyze performance of the drainage system. These analysis results show that the suggested horizontal pre-drainage system provides a clear drainage and water head reducing effect. Finally, the proposed system can be a new alternative to the present water controlling methods applied to subsea tunnels.
Keywords
drainage system; flooding; leakage; seepage analysis; subsea tunnel;
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