Geomechanics and Engineering

  • 제30권4호
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  • Pages.363-372
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  • 2022
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Analytical behavior of longitudinal face dowels based on an innovative interpretation of the ground response curve method

  • 투고 : 2021.07.17
  • 심사 : 2022.07.24
  • 발행 : 2022.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

One of the most frequent issues in tunnel excavation is the collapse of rock blocks and the dropping of rock fragments from the tunnel face. The tunnel face can be reinforced using a number of techniques. One of the most popular and affordable solutions is the use of face longitudinal dowels, which has benefits including high strength, flexibility, and ease of cutting. In order to examine the reinforced face, this work shows the longitudinal deformation profile and ground response curve for a tunnel face. This approach is based on assumptions made during the analysis phase of problem solving. By knowing the tunnel face response and dowel behavior, the interaction of two elements can be solved. The rock element equation derived from the rock bolt method is combined with the dowel differential equation to solve the reinforced ground response curve (GRC). With a straightforward and accurate analytical equation, the new differential equation produces the reinforced displacement of the tunnel face at each stage of excavation. With simple equations and a less involved computational process, this approach offers quick and accurate solutions. The FLAC3D simulation has been compared with the suggested analytical approach. A logical error is apparent from the discrepancies between the two solutions. Each component of the equation's effect has also been described.

키워드

참고문헌

  1. Alonso, E., Alejano, L., Varas, F., Fdez-Manin, G. and Carranza-Torres, C. (2003), "Ground response curves for rock masses exhibiting strain-softening behaviour", Int. J. Numer. Anal. Meth. Geomech., 27(13), 1153-1185. https://doi.org/10.1002/nag.315.
  2. Brown, E. and Hoek, E. (1980), Underground Excavations in Rock, CRC Press.
  3. Brown, E.T., Bray, J.W., Ladanyi, B. and Hoek, E. (1983), "Ground response curves for rock tunnels", J. Geotech. Eng., 109(1), 15-39. https://doi.org/10.1061/(ASCE)0733-9410(1983)109:1(15).
  4. Cai, Y., Esaki, T. and Jiang, Y. (2004), "A rock bolt and rock mass interaction model", Int. J. Rock Mech. Min. Sci., 41(7), 1055-1067. https://doi.org/10.1016/j.ijrmms.2004.04.005.
  5. Chen, G.H., Zou, J.F. and Qian, Z.H. (2019), "An improved collapse analysis mechanism for the face stability of shield tunnel in layered soils", Geomech. Eng., 17(1), 97-107. https://doi.org/10.12989/gae.2019.17.1.097.
  6. Dias, D. (2011), "Convergence-confinement approach for designing tunnel face reinforcement by horizontal bolting", Tunnel. Underg. Space Technol., 26(4), 517-523. https://doi.org/10.1016/j.tust.2011.03.004.
  7. Fahimifar, A. and Soroush, H. (2005), "A theoretical approach for analysis of the interaction between grouted rockbolts and rock masses", Tunnel. Underg. Space Technol., 20(4), 333-343. https://doi.org/10.1016/j.tust.2004.12.005.
  8. Hoek, E. (2001), "Rock mass properties for underground mines", Underground Mining Methods: Engineering Fundamentals And International Case Studies, 21.
  9. Hoek, E. (2018), Support for Very Weak Rock Associated with Faults and Shear Zones, Routledge.
  10. Lee, Y.K. and Pietruszczak, S. (2008), "A new numerical procedure for elasto-plastic analysis of a circular opening excavated in a strain-softening rock mass", Tunnel. Underg. Space Technol., 23(5), 588-599. https://doi.org/10.1016/j.tust.2007.11.002.
  11. Li, T. and Yang, X. (2019), "Probabilistic analysis for face stability of tunnels in Hoek-Brown media", Geomech. Eng., 18(6), 595-603. https://doi.org/10.12989/gae.2019.18.6.595.
  12. Oreste, P. (2013), "Face stabilization of deep tunnels using longitudinal fibreglass dowels", Int. J. Rock Mech. Min. Sci., 58, 127-140. https://doi.org/10.1016/j.ijrmms.2012.07.011.
  13. Pan, Q. and Dias, D. (2017), "Safety factor assessment of a tunnel face reinforced by horizontal dowels", Eng. Struct., 142, 56-66. https://doi.org/10.1016/j.engstruct.2017.03.056.
  14. Park, K.H., Tontavanich, B. and Lee, J.G. (2008), "A simple procedure for ground response curve of circular tunnel in elastic-strain softening rock masses", Tunnel. Underg. Space Technol., 23(2), 151-159. https://doi.org/10.1016/j.tust.2007.03.002.
  15. Ranjbarnia, M., Rahimpour, N. and Oreste, P. (2018), "A simple analytical approach to simulate the arch umbrella supporting system in deep tunnels based on convergence confinement method", Tunnel. Underg. Space Technol., 82, 39-49. https://doi.org/10.1016/j.tust.2018.07.033.
  16. Senent, S., Mollon, G. and Jimenez, R. (2013), "Tunnel face stability in heavily fractured rock masses that follow the Hoek- Brown failure criterion", Int. J. Rock Mech. Min. Sci., 60, 440-451. https://doi.org/10.1016/j.ijrmms.2013.01.004.
  17. Wang, Y. (1996), "Ground response of circular tunnel in poorly consolidated rock", J. Geotech. Eng., 122(9), 703-708. https://doi.org/10.1061/(ASCE)0733-9410(1996)122:9(703).
  18. Yoo, C.J.C. and Geotechnics (2002), "Finite-element analysis of tunnel face reinforced by longitudinal pipes", Comput. Geotech., 29(1), 73-94. https://doi.org/10.1016/S0266-352X(01)00020-9.
  19. Zhang, B., Jiang, J., Zhang, D.B. and Liu, Z. (2021), "Upper bound solution of collapse pressure and permanent displacement of 3D tunnel faces using the pseudo-dynamic method and the kinematic approach", Geomech. Eng., 25(6), 521-533. https://doi.org/10.12989/gae.2021.25.6.521.