NATM 터널 일방향 역굴착에 따른 터널거동 및 안정성에 관한 연구
- Alternative Title
- The study on the tunnel behavior and stability by an unidirectional inverse excavation
- Abstract
- In a tunnel excavation work, the inside of tunnel is excavated by a bidirectional excavation using a ground stability and longitudinal arching effect of a tunnel but recently an unidirectional excavation is tried to reduce a public grievance and promote effective excavation. But construction cases and study products about the unidirectional excavation is insufficient.
Therefore this research investigated theoretically a stability of the unidirectional inverse excavation. As a result of the three dimensional numerical analysis in the unidirectional inverse excavation and bidirectional excavation, a crown settlement is similar in the two conditions that is caused by a ground reinforcement effect using an umbrella arch method.
A bending compressive stress of the shotcrete and an axial force of the rock bolt was shown secure a tunnel stability because a stress of the shotcrete and rock bolt is within allowable value in all two methods.
An infinitesimal ahead displacement of portal slopes that is in the limits of stability in general is generated by a tunnel excavation in all two methods . In this research, a noise reduction effect of about 15dB in the unidirectional inverse excavation process shows less than those of bidirectional method.
- Issued Date
- 2008
- Awarded Date
- 2008. 8
- Type
- Dissertation
- Keyword
- unidirectional inverse excavation bidirectional excavation arching effect three dimensional numerical analysis
- Publisher
- 부경대학교 산업대학원
- Alternative Author(s)
- Roh, Su-Dong
- Affiliation
- 부경대학교 산업대학원
- Department
- 산업대학원 토목공학과
- Table Of Contents
- Ⅰ. 서론 = 1
1.1 연구의 배경 = 1
1.2 연구의 목적 = 2
1.3 연구의 범위 = 2
1.4 연구의 방법 = 2
Ⅱ. 이론적 배경 = 4
2.1 NATM 공법개요 = 4
2.2 NATM 공법특징 = 5
2.3 NATM 터널의 특성 = 5
2.3.1 터널천단부의 지반침하 = 5
2.3.2 터널 주변의 지반변위 = 6
2.3.3 터널막장면 아칭효과 = 6
2.5. 문헌연구 = 8
Ⅲ. 자료수집 및 분석 = 12
3.1. 자료수집분석 = 12
3.1.1 주변 지형 및 지질 현황 = 12
3.1.2 설계현황(양방향정굴착) = 13
3.1.3 변경시공계획(일방향역굴착) = 14
3.2. 일방향역굴착 사례 = 16
3.2.1 터널갱구부 굴착방향에 따른 거동특성 분석 = 16
3.2.2 일방향역굴착 시공사례분석 = 18
Ⅳ. 결과 및 고찰 = 20
4.1. 결과 = 20
4.1.1 수치해석 = 20
4.1.2 분석결과 = 34
4.2. 고찰 = 41
4.2.1 천단침하에 대한 고찰 = 41
4.2.2 지보재응력에 대한 고찰 = 41
4.2.3 갱구비탈면 변위에 대한 고찰 = 41
4.2.4 진동, 소음 분석 결과 및 고찰 = 42
Ⅴ. 결론 = 43
참고문헌 = 45
- Degree
- Master
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