• Location

Deungnyang-myeon ~ Beolgyo-eup, Boseong-gun, Jeollanam-do

•  Description
• Total L=20,263m
• Tunnel L=10,869m (Samjeong 2 Tunnel L=7,299m, Sinwol Tunnel L=3,570m)
• 3 Inclined Tunnels (#1 Inclined Tunnel L=482m, #2 Inclined Tunnel L=400m, #3 Inclined Tunnel L=435m)

• Technical Issue              
• Invert installation throughout the tunnel to prevent the tunnel floor from rising. 
• Installation of the shortest straight inclined tunnel to improve constructability and convenience of maintenance.

• Installation of a smart smoke control system and rescue platform to improve long tunnel evacuation performance.

• Establishment of a one-way tunnel excavation plan to prevent civil complaints from nearby villages.
• Establishment of a 5-step grouting plan to improve tunnel stability in a large-scale fault zone(F2).