Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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Slope Behavior Analysis Using the Measurement of GFRP Underground Displacement

GFRP 록볼트 계측을 통한 사면 거동 분석

  • Jin, Ji-Huan (Smart Geotech Co., LTD., Kangwon National University) ;
  • Lim, Hyun-Taek (Department of Regional Infrastructure Engineering, Kangwon National University) ;
  • Bibek, Tamang (Department of Regional Infrastructure Engineering, Kangwon National University) ;
  • Chang, Suk-Hyun (Dongmyeong Engineering Consultants & Architecture Co., LTD.) ;
  • Kim, Yong-Seong (Department of Regional Infrastructure Engineering, Kangwon National University)
  • Received : 2018.10.17
  • Accepted : 2018.10.31
  • Published : 2018.12.30
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Abstract

Although many researches related to monitoring and automatic measuring devices for early warning system during slope failure have been carried out in Korea and aboard, most of the researches have installed measuring devices on the slope surface, and there are only few researches about warning systems that can detect and warn before slope failure and disaster occurs. In this study, slope failure simulation experiment was performed by attaching sensors to rock bolts, and initial slope behavior characteristics during slope failure were analyzed. Also, the experiment results were compared and reviewed with varied slope conditions, i.e. shotcrete slope and natural slope, and varied material conditions, i.e. GFRP and steel rock bolt. This study can be used as a basic data in development of warning and alarm system for early evacuation through early detection and warning before slope failure occurs in steep slopes and slope failure vulnerable areas.

국내 외에서 사면 붕괴 조기 경보를 위한 모니터링 및 자동측정기에 대한 많은 연구가 있지만 대부분 사면 붕괴 측정기가 사면의 표층에 설치되어 있어 사면의 붕괴 등 재난이 발생되기 전에 감지 및 경보가 가능한 시스템에 대한 연구는 거의 없는 실정이다. 본 연구에서는 록볼트에 센서를 부착하여 사면 붕괴 모의 실험을 수행하였고, 사면 붕괴 초기에 발생하는 사면 거동 특성을 분석하였다. 또한, 숏크리트를 타설한 사면과 자연사면, GFRP와 나선형 철근 록볼트를 사용하여 사면 조건 및 재료 조건에 따른 실험을 수행하고 결과를 비교 검토하였다. 본 연구는 급경사지 및 산사태 위험 지역 등 사면 붕괴 발생 전 조기 감지 및 경보를 통하여 사전에 대피할 수 있는 예 경보시스템 개발 시 기초자료로 활용 될 수 있을 것으로 판단된다.

Keywords

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Fig. 1. Construction of model slope

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Fig. 2. Cross section view of model slope

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Fig. 5. Schematic diagram of strain sensor

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Fig. 6. Sensor displacement measuring

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Fig. 7. Calibration of strain sensor (GFRP)

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Fig. 8. Calibration of strain sensor (Steel)

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Fig. 9. Schematic view of sensor installment

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Fig. 11. Sensor drilled into the model slope

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Fig. 10. Data logging system

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Fig. 12. Shotcrete spraying

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Fig. 14. Cross section showing stepwise excavation process

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Fig. 13. End of shotcrete spray

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Fig. 15. Excavating model slope

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Fig. 16. Excavating model slope (Case 1-1)

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Fig. 18. Excavating model slope (Case 2-1)

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Fig. 20. All GFRP displacement data during 3.0 m height excavation

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Fig. 17. Excavating model slope (Case 1-2)

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Fig. 19. Excavating model slope (Case 2-2)

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Fig. 21. All GFRP displacement data during 4.0 m height excavation

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Fig. 22. All steel bar displacement data during 3.0 m height excavation

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Fig. 23. All steel bar displacement data during 4.0 m height excavation

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Fig. 3. GFRP strain sensor

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Fig. 4. Steel bar strain sensor

Table 1. Product specification

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References

  1. Biron, C. and Arioglu, E. (1983), Design of Supports in Mines, Ed. John Wiley & Sons, p.248.
  2. Bischoff, J. A. and Smart, J. D. (1975), A method of computing a rock reinforcement system which is structurally equivalent to an internal support system, 16th Symposium on Rock Mechanics, Minneapolis, Minnesota, pp.179-184.
  3. Cho, S. D., Lee, K. W., Yoon, S. H. and Kim, C. S. (2004), Development of automated slope monitoring system for management and failure forecast of load cut slopes, Journal of the Korean Society of Civil Engineers, Vol.24, No.1C, pp.1-10 (In Korean).
  4. Cording, E. J. and Deere, D. U. (1972), Rock tunnel supports and field measurements, Proceedings Vol. I, North American Rapid Excavation and Tunneling Conference, Chicago, pp.601-622.
  5. Hyett, A. J., Bawden, W. R., Hedrick, N. and Blackall, J. (1996), A laboratory evaluation of the 25 mm Garford bulb anchor for cable bolt reinforcement, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, Vol. 33, No. 4, pp.172.
  6. Jeffrey, R. G. and Daeman, J. K. (1983), Analysis of rockbolt reinforcement of layered rock using beam equations, Proc. of the Int. Sym. on Rock Bolting, Abisko, pp.173-185.
  7. Kim, J. S. (2013), A study on the construction of monitoring system based on USN for prediction of landslide collapse, Ph.D Thesis, Kangwon National University. (In Korean)
  8. Kim, S. H. and Bang, G. M. (2005), A Study on the change of strength parameters reinforced rock bolt in the ground around tunnel, Tunnelling technology, Journal of the Korean Tunnel Engineering, Vol.7, No.1, pp. 51-61. (In Korean)
  9. Li, C. and Stillborg, B. (1999,) Analytical models for rock bolts, International Journal of Rock Mechanics and Mining Sciences, Vol. 36, pp.1013-1029. https://doi.org/10.1016/S1365-1609(99)00064-7
  10. Moon, W. J., Im, H. D., Jung, K. B., Kim, J. S. and Lee, S. D. (2005), Supporting effects of system bolting at the tunnel in sandy ground, Proc. of Korean Society of Civil Engineers, pp.5555-5558. (In Korean)
  11. Natau, O. and Wullshlager, D. (1983), Studies of the composite system of rock mass and non-prestressed grouted rock bolts, Proc. of the Int. Sym. on Rock Bolting, Abisoko, pp.75-85.
  12. Shin, J. H. and Song, B. H. (2012), Development of slope monitoring system using VW Piezometer and Inclinometer, Journal of Korean Institute of Information Technology, Vol.10, No.3, pp.37-45. (In Korean)
  13. Villasecaus, E. (2008), Quantifying the performance of resin anchored rock bolts in the Austrailian underground hard rock mining industry, International Journal of Rock Mechanics and Mining Sciences, Vol.45, pp.94-102. https://doi.org/10.1016/j.ijrmms.2007.03.004