KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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A Study on Stress Redistribution Mechanism for Tunneling in an Unconsolidated Ground with Inclined Layers

미고결 층상지반에서 터널굴착시 응력재분배 메커니즘에 관한 연구

  • 박시현 (한국시설안전기술공단 지하시설실) ;
  • 안상로 (한국시설안전기술공단 지하시설실)
  • Received : 2005.10.25
  • Accepted : 2005.12.14
  • Published : 2006.01.31
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Abstract

This study is aimed at to examine the stress redistribution mechanism for tunneling in an unconsolidated ground with inclined layers through model tests. To make the unconsolidated ground, two dimensional model ground is prepared with aluminum rods and blocks, which are frictional resistance free between testing apparatus walls and ground materials, by establishing the ground materials self-supporting. It is carried out to measure the ground deformation and the stress redistribution for model ground with tunneling by measuring apparatus respectively. For the ground deformation, surface settlements are measured to examine the deformation features during tunnel excavation. For the stress redistribution, the earth pressure acting on both the tunneling part and its surrounding parts is measured to examine their mutual relationship. Based on test results, precise examination is conducted on the stress redistribution mechanism in the unconsolidated ground with inclined layers during tunnel construction.

본 논문은 미고결 층상 지반에서 터널을 굴착함으로써 발생하는 응력 재분배 메커니즘을 모형 실험을 통해 규명한 것이다. 미고결 층상 지반을 모사하기 위해서는, 지반재료 자체만으로 자립이 가능케 하여 모형토조와의 마찰을 배제시킬수 있는 알루미늄 봉과 블록을 이용한 2차원 모형 실험을 실시하였다. 지층이 경사진 모형 지반에 대하여 터널 굴착에 따른 지반 변형과 응력 재분배 현상을 계측기를 통하여 각각 측정하였다. 지반변형에 대해서는, 지표면의 침하형상을 측정하여 굴착에 따른 변형 특성을 살펴보았다. 응력 재분배 현상에 대해서는, 터널 작용 토압과 터널 주변부 작용 토압의 변화를 각각 측정하여 상호 검토를 실시하였다. 이러한 실험 결과를 토대로 미고결 층상 지반에서 터널 굴착에 따른 지반의 변형 및 응력 재분배 메커니즘에 대한 상세한 검토를 수행하였다.

Keywords

References

  1. 신방웅, 채현식, 김홍택, 박사원, 신진택(2000) 탄소봉 실험을 이용한 조립토 Piled Raft 기초의 거동 연구. 대한토목학회 학술발표회, pp. 189-192
  2. 정호영(1986) 조립질의 부분침하에 의한 모형실험적 연구. 공학석사학위논문, 한국과학기술원
  3. 홍성완(1986) 사칠토내의 국부침하에 따른 지반변위의 무라야마(村山) 산정식에 대한 연구. 대한토질공학회지, 대한토질공학회 , Vol. 2-2, pp. 47-58
  4. 足立紀尙,木村亮,岸田潔,伊藤浩志(2001)降下床實驗によるトンネル掘削過程を考慮したトンネルおよび周遠地盤の力學擧動の解明.日本土木學會集, Vol.694,No.111-57,pp.277-296
  5. 井上泰介,中井照夫(2004)山留め掘削時における土壁.饗形の3次元特性(その1:モデル實驗).日本地盤工學會年次學術發表會,CD
  6. 眞弓英木,眞下英人,砂金伸治(2001)不達續地山におけるトンネル作用土壁に關する基礎的研究.第24回日本道路會義論文集,(祉)日本道路協合,pp.94-95
  7. 村山朔郞,松岡元(1969)粒狀土地盤の局部沈下現象について.日本土木學會論文報告集,第172號,pp.31-41
  8. 日本道路公園(1998)上越自動車道五日市トンネル工事
  9. 野口利雄,垂水箇志(1996)砂地盤中のトンネル掘削に伴う荷重の再配分に伴する基礎的硏究.日本土木學會論文集,Vol.534,No.VI-30,pp.77-85
  10. Adachi, T., Tamura, T., Kimura, M., and Aramaki, T. (1994) Earth pressure distribution in trapdoor tests, Proc. 29th Japan National Conf. on Soil Mech. and Foundation Engineering, Japan, pp. 1989-1990
  11. Atkinson, J.H. and David, M.P. (1977) Subsidence above shallow tunnels in soft ground. Proc. ASCE, GT4, pp. 370-325
  12. Barton, N., Lien R., and Lunde J .(1974) Classification of rock masses for the design of tunnel support. In. Rock Mechanics, Vol. 6, pp. 189-236 https://doi.org/10.1007/BF01239496
  13. Oaemen, J.J.K. (1975) Tunnel support loading caused by rockfailure. Ph.D. thesis, University of Minnesota, Minneapolis, U.S.A
  14. Deere, D.U., Pech R.B., Monsees J.E., and Schmidt B. (1969) Design of tunnel liners and support system. Highway Research Rechrd No. 339, U.S. Department of Transportation, Washington D.C
  15. Jethwa, J.L. (1981) Evaluation of rock pressure under squeezing rock conditions for tunnels in Himalayas. Ph.D. thesis, Univ. of Roorkee, India
  16. JSCE( 1996) Japanese standard jor mountain tunneling
  17. Ladanyi, B. and Hoyaux, B. (1959) A study of the trapdoor problem in a granular mass. Can. Geot. J., Vol. 6, No.1, pp.1-14
  18. Mcnearny, R.L. and Abel, Jr. I.F. (1993) Large-scale two-dimensional block caving model tests. Int. J Rock Mech. Sci. & Geomech. Vo1.30, No.2, pp. 93-109 https://doi.org/10.1016/0148-9062(93)90703-G
  19. Murayama, S. (1968) Earth Pressure on Vertically Yielding Section in Sand Layer. Disaster Prevention Research Institute, Annuals, Kyoto Univ., pp. 549-565. (in Japanese)
  20. Nakai, T., Kawano, H., Murata, T., Sakano, S., and Hasimoto, M. (1999) Model tests and numerical simulation of braced excavation in sandy ground: Influence of construction history, wall friction, wall stiffness, strut position and strut stiffness. Soils and Foundations, Vol. 39, NO.3
  21. Park, S.H. and Adachi, T. (2001) Laboratory model tests and FE analyses on tunneling in the unconsolidated ground with inclined layers. Tunnelling and Underground Space Technology, Vol. 17, No.2, pp. 181-193 https://doi.org/10.1016/S0886-7798(02)00003-2
  22. Potts, D.M. (1976) Behavior of lined and unlined cylindrical cavities in sand. PhD thesis, Cambridge Univ
  23. Shimada, R. (1980) Surface settlement above the conventionally excavated tunnels with thin earth cover. Proc. of the Japan Society of Civil Engineers, 296, 97-109. (in Japanese)
  24. Szechy, K. (1973) The Art of Tunnelling
  25. Terzaghi, K. (1936) Stress distribution in dry and in saturated sand above a yielding trapdoor. Proc. 1st Int. Conf. Soil Mech. Found. Engng., Cambridge, Vol. I, pp. 307-311
  26. Terzaghi, K. (1946) Rock defects and load on tunnel supports. Introduction to Rock Tunneling with Steel Supports, R.V. Proctor and T.C. White, Youngstown, Ohio, U.S.A., Commercial Shearing and Stamping
  27. Unal, E. (1984) Design guidelines and roof control standards for coal mine roofs. PhD thesis, Pennsylvania State University
  28. Vardoulakis, I., Graf, B., and Gudehus, G (1981) Trapdoor problem with dry sand: A statical approach based upon model test kinematics, Int. J Num. Analy. Meth. Geomech., Vol. 5, pp. 57-78 https://doi.org/10.1002/nag.1610050106