한국지반공학회:학술대회논문집 (Proceedings of the Korean Geotechical Society Conference)
- 한국지반공학회 2000년도 봄 학술발표회 논문집
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- Pages.87-92
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- 2000
연약 파쇄 지반내 터널의 굴착.보강 설계 및 안정성 분석
Excavation Support Design and Stability Analysis of Shallow Tunnel in Heavily Fractured Rock Mass
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신희순
(한국자원연구소 자원연구부) ;
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신중호
(한국자원연구소 자원연구부) ;
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박찬
(한국자원연구소 자원연구부) ;
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한공창
(한국자원연구소 자원연구부) ;
- 최영학 (한국고속철도) ;
- 최용기 (대원토질(주))
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Shin, Hee-Soon
(Korea Institute of Geology, Mining & Materials) ;
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Synn, Joong-Ho
(Korea Institute of Geology, Mining & Materials) ;
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Park, Chan
(Korea Institute of Geology, Mining & Materials) ;
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Han, Kong-Chang
(Korea Institute of Geology, Mining & Materials) ;
- Choi, Young-Hak (Korea High Speed Rail) ;
- Choi, Yong-Ki (Dae Won Soil Co.,Ltd.)
- 발행 : 2000.03.01
초록
In excavation of tunnels especially located in shallow depth, it is not rare to meet geological change in excavation progress worse than expected in the initial design stage. This paper present a case study on the re-design of excavation and support system of a shallow tunnel under construction where it meets the unexpected bad geological condition during excavation. The detailed geological investigation shows that the rock mass is heavily weathered and fractured with RMR value less than 20. Considering this geological condition, the design concept is focused on the reinforcement of the ground preceding the excavation of tunnel. Two design patterns, LW-grouting & forepoling with pilot tunnelling method and the steel pipe reinforced grouting method, are suggested. Numerical analysis by FLAC shows that these two patterns give the tunnel and roof ground stable in excavation process while the original design causes severe failure zone around the tunnel and floor heaving. In point of the mechanical stability and the degree of construction, the steel pipe reinforced grouting technique proved to be good for the reinforcement of heavily fractured rock mass in tunnelling. This assessment and design process would be a guide in the construction of tunnels in heavily weathered and fractured rock mass situation.
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