Geomechanics and Engineering

  • 제19권4호
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  • Pages.315-327
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  • 2019
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Two dimensional finite element modeling of Tabriz metro underground station L2-S17 in the marly layers

  • 투고 : 2019.07.23
  • 심사 : 2019.11.08
  • 발행 : 2019.11.20
⟨ 이전 논문 다음 논문 ⟩

초록

Deep excavations for development of subway systems in metropolitan regions surrounded by adjacent buildings is an important geotechnical problem, especialy in Tabriz city, where is mostly composed of young alluvial soils and weak marly layers. This study analyzes the wall displacement and ground surface settlement due to deep excavation in the Tabriz marls using two dimensional finite element method. The excavation of the station L2-S17 was selected as a case study for the modelling. The excavation is supported by the concrete diaphragm wall and one row of steel struts. The analyses investigate the effects of wall stiffness and excavation width on the excavation-induced deformations. The geotechnical parameters were selected based on the results of field and laboratory tests. The results indicate that the wall deflection and ground surface settlement increase with increasing excavation depth and width. The change in maximum wall deflection and ground settlement with considerable increase in wall stiffness is marginal, however the lower wall stiffness produces the larger wall and ground displacements. The maximum wall deflections induced by the excavation with a width of 8.2 m are 102.3, 69.4 and 44.3 mm, respectively for flexible, medium and stiff walls. The ratio of maximum ground settlement to maximum lateral wall deflection approaches to 1 with increasing wall stiffness. It was found that the wall stiffness affects the settlement influence zone. An increase in the wall stiffness results in a decrease in the settlements, an extension in the settlement influence zones and occurrence of the maximum settlements at a larger distance from the wall. The maximum of settlement for the excavation with a width of 14.7 m occurred at 6.1, 9.1 and 24.2 m away from the wall, respectively, for flexible, medium and stiff walls.

키워드

참고문헌

  1. Ahmed, S.M. and Fayed, A.L. (2015), "Mitigation of risks associated with deep excavations: State of the art review", Proceedings of the Industry Academia Collaboration Conference (IAC 2015), Cairo, Egypt, April.
  2. Asghari Kaljahi, E. Barzegari, G. and Jalali-Milani, S. (2019), "Assessment of the swelling potential of Baghmisheh marls in Tabriz, Iran", Geomech. Eng., 18(3), 267-275. http://doi.org/10.12989/gae.2019.18.3.267.
  3. Asghari-Kaljahi, E., Yousefi-Bavil, K. and Babazadeh, M. (2015), "A study of ground natural temperature along Tabriz metro line 2, Iran", Eng. Geol. Soc. Territory, 6, 295-298. https://doi.org/10.1007/978-3-319-09060-3_49.
  4. Barzegari, G., Shayan, F. and Chakeri, H. (2018), "Investigations on Geotechnical Aspects for TBM Specification on the Tabriz Metro Line 3, Iran", Geotech. Geol. Eng., 36(6), 3639-3663. http://doi.org/10.1007/s10706-018-0563-2.
  5. Bentler, D.J. (1998), "Finite element analysis of deep excavations", Ph.D. Dissertation, Virginia Polytechnic Institute and State University, Blacksburg, Virginia. U.S.A.
  6. Brinkgreve, R.B.L. (2002), Plaxis 2D-Version 8 Manuals, A.A.Balkema, The Netherlands.
  7. Cheshomi, A. and Ghodrati, M. (2015), "Estimating Menard pressuremeter modulus and limit pressure from SPT in silty sand and silty clay soils. A case study in Mashhad, Iran", Geomech. Geoeng., 10(3), 194-202. https://doi.org/10.1080/17486025.2014.933894.
  8. Do, N.A. Dias, D., Oreste, P. and Djeran-Maigre, I. (2014), "2D numerical investigations of twin tunnel interaction", Geomech. Eng., 6(3), 263-275. http://dx.doi.org/10.12989/gae.2014.6.3.000.
  9. Dobereiner, L. (1984), "Engineering geology of weak sandstones", Ph.D. Dissertation, University of London, London, U.K.
  10. Dong, Y., Burd, H., Houlsby, G. and Hou, Y. (2014), "Advanced finite element analysis of a complex deep excavation case history in Shanghai", Front. Struct. Civ. Eng., 8(1), 93-100. https://doi.org/10.1007/s11709-014-0232-3.
  11. Edalat, K., Vahdatirad, M.J., Ghodrat, H., Firouzian, S. and Barari, A. (2010), "Choosing TBM for Tabriz subway using multi criteria method", J. Civ. Eng. Manag., 16(4), 531-539. https://doi.org/10.3846/jcem.2010.59.
  12. Finno, R.J. Bryson, S. and Calvello, M. (2002), "Performance of a stiff support system in soft clay", J. Geotech. Geoenviron. Eng., 128(8), 660-671. https://doi.org/10.1061/(ASCE)1090-0241(2002)128:8(660).
  13. Firuzi, M. Asghari-Kaljahi, E. and Akgun, H. (2019), "Correlations of SPT, CPT and pressuremeter test data in alluvial soils. Case study: Tabriz Metro Line 2, Iran", Bull. Eng. Geol. Environ., 1-20. https://doi.org/10.1007/s10064-018-01456-0.
  14. Fonte, J.B. (2010), "Numerical modeling of excavations below the water table", Ph.D. Dissertation, Universidada Do Porto, Porto, Portugal.
  15. Georgiannou, V., Burland, J. and Hight, D. (1990), "The undrained behaviour of clayey sands in triaxial compression and extension", Geotechnique, 40(3), 431-449. https://doi.org/10.1680/geot.1990.40.3.431.
  16. Ghahreman, B. (2004), "Analysis of ground and building response around deep excavations in sand", Ph.D. Dissertation, University of Illinois at Urbana-Champaign, Champaign Illinois, U.S.A.
  17. Ghazvinian, A., Fathi, A. and Moradian, Z. (2008), "Failure behavior of marlstone under triaxial compression", Int. J. Rock Mech. Min. Sci., 5(45), 807-814. https://doi.org/10.1016/j.ijrmms.2007.09.006.
  18. Goh, A., Fan, Z., Hanlong, L., Wengang, Z. and Dong, Z. (2018), "Numerical Analysis on Strut Responses Due to One-Strut Failure for Braced Excavation in Clays", Proceedings of the 2nd International Symposium on Asia Urban GeoEngineering, Changsha, China, November.
  19. He, M. (2014), "Latest progress of soft rock mechanics and engineering in China", J. Rock Mech. Geotech. Eng., 6(3), 165-179. https://doi.org/10.1016/j.jrmge.2014.04.005.
  20. Hesami, S., Ahmadi, S., Ghalesari, A.T. and Hasanzadeh, A. (2013), "Ground surface settlement prediction in urban areas due to tunnel excavation by the NATM", Elec. J. Geotech. Eng., 18, 1961-1972.
  21. Hooshmand, A. Aminfar, M.H. Asghari, E. and Ahmadi, H. (2012), "Mechanical and physical characterization of Tabriz marls, Iran", Geotech. Geol. Eng., 30(1), 219-232. https://doi.org/10.1007/s10706-011-9464-3
  22. Hsieh, P., Kung, T., Ou, C. and Tang, Y. (2003), "Deep excavation analysis with consideration of small strain modulus and its degradation behavior of clay", Proceedings of the 12th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, Singapore, August.
  23. Hsieh, P.G. and Ou, C.Y. (1998), "Shape of ground surface settlement profiles caused by excavation", Can. Geotech. J., 35(6), 1004-1017. https://doi.org/10.1139/t98-056.
  24. Hsiung, B.C.B. and Dao, S.D. (2015), "Prediction of ground surface settlements caused by deep excavations in sands", Geotech. Eng., 46(3), 111-118. https://doi.org/10.1007/s10706-011-9464-3.
  25. Hung, C. Ling, H.I. and Kaliakin, V.N. (2014), "Finite element simulation of deep excavation failures", Transport. Infrastruct. Geotechnol., 1(3-4), 326-345. https://doi.org/10.1007/s40515-014-0011-6.
  26. Imansazan Consulting Engineers (2017), "Conceptual design of eastern stations of TML2 project", Presented to TURO.
  27. ISRM (1981), Rock Characterization Testing and Monitoring, Pergamon Press, New York, U.S.A.
  28. Jaky, J. (1944), "The coefficient of earth pressure at rest", J. Soc. Hung. Arch. Eng., 355-358.
  29. Jalali-Milani, S. Asghari-Kaljahi, E., Barzegari, G. and Hajialilue-Bonab, M. (2017), "Consolidation deformation of Baghmisheh marls of Tabriz, Iran", Geomech. Eng., 12(4), 561-577. http://doi.org/10.12989/gae.2017.12.4.561.
  30. Kanji, M.A. (2014), "Critical issues in soft rocks", J. Rock Mech. Geotech. Eng., 6(3), 186-195. https://doi.org/10.1016/j.jrmge.2014.04.002.
  31. Kulesza, R. Boussoulas, N. and Marr, W.A. (2008), "Deep excavations in hard sandy clays for stations and shafts of the Athens Metro Stavros extension", Proceedings of the 6th International Conference on Case Histories in Geotechnical Engineering, Rolla, Missouri, U.S.A., August.
  32. Likitlersuang, S., Surarak, C., Wanatowski, D., Oh, E. and Balasubramaniam, A. (2013), "Finite element analysis of a deep excavation: A case study from the Bangkok MRT", Soils Found., 53, 756-773. http://dx.doi.org/10.1016/j.sandf.2013.08.013.
  33. Masuda, T. Einstein, H.H. and Mitachi, T. (1994), "Prediction of lateral deflection of diaphragm wall in deep excavations", Doboku Gakkai Ronbunshu, 505, 19-29.
  34. Mohammadi, S. Firuzi, M. and Asghari Kaljahi, E. (2015), "Geological-geotechnical risk in the use of EPB-TBM, case study: Tabriz Metro, Iran", Bull. Eng. Geol. Environ., 75(4), 1571-1583. https://doi:10.1007/s10064-015-0797-7.
  35. Nabavi, M. (1976), An Introduction to the Geology of Iran, in Geological Survey of Iran (in Persian).
  36. Nawel, B. and Salah, M. (2015), "Numerical modeling of two parallel tunnels interaction using three-dimensional finite elements method", Geomech. Eng., 9(6), 775-791. https://doi.org/10.12989/gae.2015.9.6.775.
  37. Ng, C.W., Huang, H. and Liu, G. (2008), "Geotechnical Aspects of Underground Construction in Soft Ground", Proceedings of the 6th International Symposium (IS-Shanghai 2008), Shanghai, China, April.
  38. Ng, C.W., Leung, E.H. and Lau, C. (2004), "Inherent anisotropic stiffness of weathered geomaterial and its influence on ground deformations around deep excavations", Can. Geotech. J., 41(1), 12-24. https://doi.org/10.1139/t03-066.
  39. Nikvar Hassani, A. Katibeh, H. and Farhadian, H. (2015), "Numerical analysis of steady-state groundwater inflow into Tabriz line 2 metro tunnel, northwestern Iran, with special consideration of model dimensions", Bull. Eng. Geol. Environ., 75(4), 1617-1627. http://dx.doi.org/10.1007/s10064-015-0802-1.
  40. Ou, C.Y. (2016), "Finite element analysis of deep excavation problems", J. Geoeng., 11(1), 1-12. http://dx.doi.org/10.6310/jog.2016.11(1).1.
  41. Ou, C.Y. and Hsieh, P.G. (2011), "A simplified method for predicting ground settlement profiles induced by excavation in soft clay", Comput. Geotech., 38(8), 987-997. https://doi.org/10.1016/j.compgeo.2011.06.008.
  42. P.O. Rahvar Consulting Engineers (2008), "Geotechnical investigation report of TML2 project", Presented to TURO.
  43. Sabzi, Z. and Fakher, A. (2015), "The performance of buildings adjacent to excavation supported by inclined struts", Int. J. Civ. Eng., 13(1), 1-13.
  44. Schweiger, H. Scharinger, F. and Luftenegger, R. (2009), "3D finite element analysis of a deep excavation and comparison with in situ measurements", Geotech. Aspects Undergr. Construct. Soft Ground, 193-199.
  45. Surarak, C., Likitlersuang, S., Wanatowski, D., Balasubramaniam, A., Oh, E. and Guan, H. (2012), "Stiffness and strength parameters for hardening soil model of soft and stiff Bangkok clays", Soils Found., 52(4), 682-697. https://doi.org/10.1016/j.sandf.2012.07.009.
  46. Tenando, E. (2004), "Strength properties and mineralogy of Singapore old alluvium", M.Sc. Thesis, National University of Singapore, Singapore.
  47. Wang, P.X., Cui, T., Shi, J.S. and Dai, R.P. (2012), "Analysis and treatment of diaphragm wall intrusion-clearance of Metro Station in soft ground", Adv. Mater. Res., 374, 2232-2238. https://doi.org/10.4028/www.scientific.net/AMR.374-377.2232.
  48. Yeow, H., Nicholson, D. and Simpson, B. (2006), "Comparison and feasibility of three dimensional finite element modelling of deep excavations using non-linear soil models", Proceedings of the International Conference on Numerical Simulation of Construction Processes in Geotechnical Engineering for Urban Environment, Bochum, Germany, March.
  49. Zahmatkesh, A. and Choobbasti, A. (2015), "Evaluation of wall deflections and ground surface settlements in deep excavations", Arab. J. Geosci., 8(5), 3055-3063. https://doi.org/10.1007/s12517-014-1419-6.
  50. Zheng, G., Du, Y., Cheng, X., Diao, Y., Deng, X. and Wang, F. (2017), "Characteristics and prediction methods for tunnel deformations induced by excavations", Geomech. Eng., 12(3), 361-397. https://doi.org/10.12989/gae.2017.12.3.361.

피인용 문헌

  1. Stability Numbers for Unsupported Conical Excavations in Multi-Layered Cohesive Soils vol.10, pp.24, 2020, https://doi.org/10.3390/app10248839
  2. Allowable wall deflection of braced excavation adjacent to pile-supported buildings vol.26, pp.2, 2019, https://doi.org/10.12989/gae.2021.26.2.161