Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)
- 2006.03a
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- Pages.980-987
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- 2006
Stability Estimation Method for Pillar Considering the Reinforcement Method during Twin-Tunnel Excavation
병설터널 굴착시 필라부의 보강을 고려한 안정성 평가기법
- Jang, Bu-Sik (Railway Tunnel Dept., Dowha Consult. Eng. Co., Ltd.) ;
- Hwang, Jung-Soon (T/K Project Term, Doosan Ind. Dev. Co., Ltd.) ;
- Ryu, June-Won (Dept. of Civil Engineering, Hong-Ik University) ;
- Lee, Eung-Ki (Geotechnical Dept., Korea Railroad Technical Co., Ltd.) ;
- Kim, Hong-Taek (Dept. of Civil Engineering, Hong-Ik University.)
- 장부식 ((주)도화종합기술공사 철도터널부) ;
- 황정순 (두산산업개발(주) 토목턴키팀) ;
- 류준원 (홍익대학교 토목공학과) ;
- 이응기 ((주)한국철도기술공사 지반공학팀) ;
- 김홍택 (홍익대학교 토목공학과)
- Published : 2006.03.24
Abstract
Recently, twin-tunnel is often designed considering the aspects of disaster prevention and economic reasons. However, the design cases and the studies are relatively insufficient. By the twin-tunnel excavation, deviate stresses of pillar between tunnels are increased and the increased stresses induce the instability of the twin-tunnel. In this study, numerical analyses about the twin-tunnel behaviour are conducted while varying ground strength, width of pillar and depth of earth cover and a series of regression analyses are carried out by using the results of numerical analyses for the twin-tunnel. Based on the numerical analyses, an estimation method of derived stresses is suggested though the regression analyses. Also, based on the results of regression analyses, an quantitative estimation method considering the reinforcement effects is also suggested. Then various parametric studies are conducted to be considered the reinforcement type and various design parameters. Finally, the efficiency of the suggested method is verified through the results of parametric studies.