1. NATM design changed into open type excavation on the 8 meter overburden of subway construction.

지하철 선로부 토피 8m의 경우 NATM공법설계를 개착공법으로 대체한 실례

Concerning to Taeku city subway construction project(1-4 site), the original design was adapted NATM Tunnel method to the 8 meter thickness of overburden. Surveyor checked sity and design material and finally decided to change into Open Cut method because overburden is not only below 1 1/2 times thickness of comparate Tunnel width but there is no traffic conjunction in job site.