광산갱도 계측을 통한 굴착에 따른 스프레이 콘크리트의 갱도 보강효과 평가
Evaluation Study on the Support Effect of Sprayed Concrete by Excavation Monitoring of Mine drift
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초록
본 연구에서는 광산갱도에서 굴착에 따른 변위 및 스프레이 콘크리트의 응력을 계측하고, 무지보 및 보강갱도에서의 안정성을 평가하였다. 갱도의 최종변위량 예측결과 무지보 갱도가 스프레이 콘크리트 보강갱도에 비해 전반적인 변위가 다소 크게 나타났으며, 스프레이 콘크리트 보강갱도의 경우 강도가 발현됨에 따라 갱도가 빨리 안정화되는 것으로 나타났다. 무지보 갱도의 한계변형률은 천단변위의 경우 주의레벨Ⅰ로 국부적으로 지반의 이완영역이 발생하여 굴착시 약간의 주의가 필요할 것으로 판단되었다. 갱도의 겉보기 탄성계수산정결과 스프레이 콘크리트의 지보효과에 의해 겉보기 탄성계수가 증가하는 효과를 확인할 수 있었고, 무지보 갱도에 비해 약 50% 이상 갱도 보강 효율이 높은 것으로 평가되었다.
Abstract
In this study, the convergence and the stress of sprayed concrete were measured in process of excavation of mine drift and it was evaluated that the stability of unsupported and supported mine drift. In result of the prediction of final displacement, the displacement of unsupported mine drift was somewhat larger than that of supported mine and sprayed concrete stress was early stabilized in supported mine. The critical strain of crown displacement in unsupported mine drift was located in Caution Level I, so it was judged that the relaxation zone was locally appeared in ground and some caution was required in process of excavation. In result of the computation of apparent young's modulus, that increased by the effect of sprayed concrete supporting and sprayed concrete supporting was highly efficient by more than 50% comparing with unsupported mine drift.
참고문헌 (25)
- "Standard Test Methods for Absorption and Bulk Specific Gravity of Dimension Stone, ASTM C97", C97M-09, 2004
- "Standard Test Method for Compressive Strength and Elastic Module of Intact Rock Core Specimens under Varying States of Stress and Temperatures, ASTM D7012-10", ~ (2004)
- Chung, H.J., "A Case Study on Displacement Forecasting Method in Tunnelling by NATM in Urban Area", Proceedings of 1993 Spring Conference on Korean Geotechnical Society, pp.27~31 (1993)
- Expressway & Transportation Research Institute, "Improvement of Support System for Road Tunnel with Rock Mass Classification", ~ (2002)
- Junichi, S., "Adaptibility of Convergence Forecasting Method for Controlling Tunnel Construction", Proceedings of 2nd International Symposium on Field Measurements in Geomechanics, Kobe, pp.907~916 (1987)
- Kim, B.J., "A Study on Ultimate Displacement Forecasting of Tunnel through Statistical Method", 석사, pp.1997
- Kim, H.Y., "Theory and Analysis Method of Tunnel Convergence", J. of Tunnel and underground space, Korean Society for Rock Mechanics, 3(1), pp.80~95 (1993)
- Development of Technique for Shotcrete Supporting and Stability Estimation of Large-scale Mine in Soft Ground, "Korea Institute of Construction Technology", Korea Resources Corporation, ~ (2008)
- Development of Supporting Application of Ready-mixed Shotcrete in Mine and Estimation of Long Term Durability, "Korea Institute of Construction Technology", Korea Resources Corporation, ~ (2009)
- Development of the Mining Sprayed Concrete and Proposing the Design Strength Classes for Application of the Domestic Mines, "Korea Institute of Construction Technology", Ministry of Trade, Industry and Energy, 1~3 (2012)
- Lee, J.H., "Case Study on the Field Measurements and Hazard Warning Levels in NATM Tunnel", Proceedings of 2008 Spring Conference on Korean Society for Rock Mechanics, Seoul, pp.203~216 (2008)
- Liu, H., "Analysis of Stability of Caverns in Week Rock", Proceedings of the International Symposium on LRC, Helsinki, pp.1319~1328 (1986)
- Ministry of Land, "Infrastructure, and Transport", Road Design Handbook Vol. 6. Tunnel, ~ (2010)
- Panet, M., "Time-dependent Deformations in Underground Works", Proceedings of 4th International Conference on Rock Mechanics, ISRM, Montreux, 3 (1979)
- Panet, M., "Analysis of Convergence behind the Face of a Tunnel", Proceedings of the International Conference on Tunnelling, The Institution of Mining and Metallurgy, Brighton, pp.197~204 (1982)
- Sagaeta, C., "Analysis of Undrained Soil Deformation due to Ground Loss", J. of Geotechnique, (37), pp.3~ (1987)
- Sakurai, S., "An Evaluation Technique of Displacement Measurements in Tunnels", J. of Geotechnical Engineering, JSCE, 317, pp.93~100 (1982)
- Sakurai, S., "Lessons Learned from Field Measurements in Tunnelling", J. of Tunnelling and Underground space Technology, 12(4), pp.453~460 (1997)
- Sakurai, S, "Practice of Urban Tunnels", pp.241~ (1998), Kajima Publ
- Sakurai, S., "Back Analysis for Tunnel Engineering as a Modern Observation Method", J. of Tunnelling and Underground Space Technology, 18(2-3), pp.185~196 (2003)
- Swoboda, G., "Finite Element Analysis of the New Austrian Tunneling Method", Proceedings of 3rd International Conference on Numerical methods in Geomechanics, Aachen, balkema, Rotterdam, pp.604~618 (1979)
- The British Tunnelling Society and The Institution of Civil Engineers, "Tunnel lining design guide", Thomas Telford, 184~ (2004)
- Vassilev, V.H., "Influence of the Heading Face and a Two-dimensional Calculation Model of Tunnel Linings", Proceedings of 6th Internationa lConference on Numerical Methods on Geomechanics, Innsbruck, 3 (1988)
- Verruijt, A., "A Complex Variable Solution for a Deforming Circular Tunnel in and Elastic Half-plane", International J. for Numerical and Analytical Methods in Geomechanics, 21(2), pp.77~89 (1997)
- 櫻井春輔, "NATMにおける現場計測と管理基準値 變", 土と基礎, 34(2), pp.5~10 (1986)