Geomechanics and Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Experimental study to determine the optimal tensile force of non-open cut tunnels using concrete modular roof method

  • Jung, Hyuk-Sang (Department of Railroad Construction & Safety Engineering, Dongyang University) ;
  • Kim, Jin-Hwan (Department of Railroad Construction & Safety Engineering, Dongyang University) ;
  • Yoon, Hwan-Hee (Department of Railroad Construction & Safety Engineering, Dongyang University) ;
  • Sagong, Myung (Korea Railroad Research Institute (KRRI)) ;
  • Lee, Hyoung-Hoon (Daesan Civil Technology)
  • Received : 2021.12.08
  • Accepted : 2022.03.05
  • Published : 2022.05.10
⟨ Previous Next ⟩

Abstract

In this study, a model experiment and field experiment was conducted to introduce the optimal tensile force when constructing a non-open cut tunnel according to the ground conditions of sandy soil. CMR (Concrete Modular Roof) method is economical because of the high precision and excellent durability, and corrosion resistance, and the inserted parts can be used as the main structure of a tunnel. In addition the CMR method has a stable advantage in interconnection because the concrete beam is press-fitted compared to the NTR (New Tubular Roof) method, and the need for quality control can be minimized. The ground conditions were corrected by adjusting the relative density of sandy soil during the construction of non-open cut tunnels, and after introducing various tensile forces, the surface settlement according to excavation was measured, and the optimal tensile force was derived. As a result of the experiment, the amount of settlement according to the relative density was found to be minor. Furthermore, analysis of each tensile force based on loose ground conditions resulted in an average decrease of approximately 22% in maximum settlement when the force was increased by 0.8 kN per segment. Considering these results, it is indicated that more than 2.0 kN tensile force per segment is recommended for settlement of the upper ground.

Keywords

References

  1. Abbas E. and Ali, A. (2019), "An overview of several techniques employed to overcome squeezing in mechanized tunnels; A case study", Geomech. Eng., 18(2), 215-224. https://doi.org/10.12989/gae.2019.18.2.215.
  2. Atkinson, J.H., Potts, D.M. and Schofield, A.N. (1977), "Centrifugal model tests on shallow tunnels in sand", Tunn. Tunn. Jan., 59-64.
  3. Attewell, P.B. and Farmer, I.W. (1974), "Ground deformations resulting from shield tunnelling in London clay", Can. Geotech. J., 11(3), 380-395. https://doi.org/10.1139/t74-039
  4. Mamaqani, B. (2014), "Numerical Modeling of Ground Movements Associated with Trenchless Box Jacking Technique", Ph.D. Thesis, The University of Texas at Arlington, Arlington, TX.
  5. Clough, G.W. and Schmidt, B. (1981), "Excavations and Tunneling in Soft Clay Engineering (Eds., E.W. Brand and R.P. Brenner)", Chap 8. Amsterdam, Elseveir.
  6. Cording, E.J. and Hansmire, W.H. (1975), "Displacement around soft ground tunnels", Proceedings of the 5th Pan-Am Conf. on Soil Mech. and Found. Engng., Buenos Aires.
  7. Das, B.M. (2010), "Principles of Geotechnical Engineering", Cengage learning, USA.
  8. Jung, J.S. and Lee, K.Y. (2015), "A Study on the prediction method of surface subduction of non-adhesive steel pipe pressure method", J. Korea Soc. Geotech. Eng., 16(11), 29-37.
  9. Kang, T.H., Jang, S.H., Choi, S.W., Lee, C.H. and Cho, J.W. (2015), "A preliminary study on the use of analytic hierarchy process for selecting a optimum trenchless excavation method", J. Korean Tunn. Undergr. Sp. Assoc., 17(6), 685-693. https://doi.org/10.9711/KTAJ.2015.17.6.685.
  10. Kim, D.K., Khanh, P., Park, S.Y., Oh, J.Y. and Choi, H.S. (2020), "Determination of effective parameters on surface settlement during shield TBM", Geomech. Eng., 21(2), 153-164. https://doi.org/10.12989/gae.2020.21.2.153.
  11. Lee, K.J,, Lee, S.H. and Cho, K.H. (2013), "A study on the prevention of ground stress relief around underground structures constructed by non-open cut construction", J. Korea Railroad Association Conference, 943-951.
  12. Mair, R.J. (1979), "Centrifugal Modelling of Tunnel Construction in Soft Clay", Ph. D. Thesis, Cambridge University.
  13. Milad, Z., Masoud, R. and Daniel, D. (2020), "3D numerical investigation of segmental tunnels performance crossing a dipslip fault", Geomech. Eng., 23(4), 351-364. https://doi.org/10.12989/gae.2020.23.4.361.
  14. Nam, K.M., Kim, J.J., Kwak, D.Y., Hafeezur, R. and Yoo, H.K. (2020), "Structure damage estimation due to tunnel excavation based on indoor model test", Geomech. Eng., 21(2), 95-102. https://doi.org/10.12989/gae.2020.21.2.095.
  15. O'Reilly, M.P. and New, B.M. (1982), "Settlements above Tunnels in The United Kingdom-their Magnitude and Prediction", Tunnelling '82, Papers Presented at the 3rd International Symposium, Inst of Mining and Metallurgy, London, England, pp. 173-181.
  16. Park, J.K., Oh, J.H., Yoo, H.W. and Md, Sharif Hossain. (2019), "Study on prediction of settlement profile due to installation of underground structures by trenchless construction through model experiments and numerical analyses", J. Korean Soc. Railway, 22(1), 27-38. https://doi.org/10.7782/jksr.2019.22.1.27
  17. Peck, R.B. (1969), "Deep excavation and tunnelling in soft ground", Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering, Mexico City.
  18. Shengbing, Y. (2018), "Limit analysis of a shallow subway tunnel with staged construction", Geomech. Eng., 15(5), 1039-1046. https://doi.org/10.12989/gae.2018.15.5.1039.
  19. Um, K.Y. (2000), "PCR/URT/JES/TRM Construction Characterization", Ground (Korea Geotechnical Society), 16(9), 36-43.