급경사 지형에 위치하고 있는 갱구부의 굴착 방안 연구 = A Study on the Excavation of Tunnel Portal Zone Located at High Steep Slope

다국어 초록 (Multilingual Abstract)

Recently, planning road construction in South Korea is focused on upgrading of the existing road by rerouting or restructuring. For this, roads under current construction in Korea go for more straight in its alignments and routing. Straight routing makes it all the more required to construct many mountain tunnels and bridges in Korea where mountains are so widely spread. Some portal of mountain tunnel is not rarely planed at high steep slope of mountain valley where it is not easy to secure working space for tunnel excavation. Reverse excavation is an alternative measure for excavation of tunnel portal at high steep slope. Construction in reverse excavation method has three important points requiring careful consideration: 1)planning of pilot tunnel in proper width, height, and length etc., 2)measure against the effect of one-side earth pressure to the direction of tunnel portal, 3)securing tunnel safety against shallow ground condition at portal zone. This paper intends to suggest applicable range of pilot tunnel for reverse excavation at the portal zone located at high steep slope, and shows result of study on the appropriateness of a reverse excavation by means of 3D numerical analysis. Result of 3D numerical analysis for reverse excavation at high steep slope shows that pilot tunneling will be applicable to start from the point 20~25m before the portal from inside the tunnel.

참고문헌 (Reference)

1 한국터널공학회, "터널의 이론과 실무" 1-5, 2003

2 현대건설, "제2영동(서울-원주) 고속도로 민간투자자사업 터널해석보고서" 2006

3 현대건설, "제2영동(서울-원주) 고속도로 민간투자자사업 지반조사보고서" 2006

4 현대건설, "제2영동(서울-원주) 고속도로 민간투자자사업 설계보고서" 2006

5 한국도로공사, "도로설계요령 제4권 터널" 156-167, 2001

6 John O. B., "Tunnel engineering handbook"