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A Case Study of Minimizing Construction Time in Long and Large Twin Tube Tunnel  

No Sang-Lim (GS건설㈜ 기술본부 지하공간팀)
Noh Seung-Hwan (GS건설㈜ 기술본부 지하공간팀)
Lee Sang-Pil (GS건설㈜ 기술본부 지하공간팀)
Kim Moon-Ho (GS건설㈜ 토목사업본부)
Seo Jung-Woo (GS건설㈜ 기술본부 토목기술)
Publication Information
Tunnel and Underground Space / v.15, no.3, 2005 , pp. 177-184 More about this Journal
Abstract
The Sapaesan tunnel, the longest twin tube tunnel (4km) in Korea with 4 lanes each, is under construction with two years of delayed schedule because of the strong opposition from environmental bodies. Therefore, maximizing the construction efficiency was needed in tunnel project to compensate for time delay. This study includes improvements in the construction of the Sapaesan tunnel such as increasing excavation length and changing excavation sequence. In this paper the system for predicting tunnel face ahead is also introduced. Bulk-Emulsion explosive and Cylinder-Cut method were adopted in tunnel blasting to increase the excavation length. Optimum tunnel excavation step was designed to make up delayed time. Tunnel foe mapping, TSP survey and geological prediction system using computerized jumbo-drill were performed fnr safe construction of long and large twin tube tunnel.
Keywords
Bulk-emulsion explosive; Cylinder-cut; Face mapping; TSP survey;
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