- Volume 20 Issue 5
DOI QR Code
Static and Dynamic Analysis for Railway Tunnel according to Filling Materials for overbroken tunnel bottom
철도터널 하부 여굴처리 방법에 대한 정적 및 동적 안정성 검토
- Seo, Jae-Won (Eone engineering, Graduate School of Railway Seoul National University of Science & Technology) ;
- Cho, Kook-Hwan (Dept of Railway Construction Engineering, Graduate School of Railway, Seoul National University of Science & Technology)
- Received : 2017.10.11
- Accepted : 2017.10.26
- Published : 2017.10.31
Alignments of railways recently constructed in Korea have been straightened due to the advent of high-speed rail, which means increasing the numbers of tunnels and bridges. Overbreak during tunnel construction may be unavoidable, and is very influential on overall stability. Over-excavation in tunneling is also one of the most important factors in construction costs. Overbreak problems around crown areas have decreased with improvements of excavation methods, but overbreak problems around bottom areas have not decreased because those areas are not very influential on tunnel stability compared with crown areas. The filling costs of 10 cm thickness of overbreak at the bottom of a tunnel are covered under construction costs by Korea Railway Authority regulations, but filling costs for more than the covered thickness are considered losses of construction cost. The filling material for overbreak bottoms of tunnels should be concrete, but concrete and mixed granular materials with fractured rock are also used for some sites. Tunnels in which granular materials with fractured rock are used may have a discontinuous section under the concrete slab track. The discontinuous section influences the propagation of waves generated from train operation. When the bottom of a tunnel is filled with only concrete material, the bottom of the tunnel can be considered as a continuous section, in which the waves generated from a train may propagate without reflection waves. However, a discontinuous section filled with mixed granular materials may reflect waves, which can cause resonance of vibration. The filled materials and vibration propagation characteristics are studied in this research. Tunnel bottom filling materials that have ratios of granular material to concrete of 5.0 %, 11.5 %, and 18.0 % are investigated. Samples were made and tested to determine their material properties. Static numerical analyses were performed using the FEM program under train operation load; test results were found to satisfy the stability requirements. However, dynamic analysis results show that some mixed ratios may generate resonance vibration from train operation at certain speeds.
Supported by : 국토교통과학기술진흥원
- T.N. Lee, D.H. Kim, Y.H. Seo (2002) A study on the development of the rock blastability classification and the methods for minimizing overbreak in tunnel, Journal of the Korean Society of Explosices and Blasting Engineering , 20(3), pp. 25-38.
- S.D.Lee, N.Y.Kim (2001) Design guide of the optimum blasting paterns for minimizing overbreak, Journal of the Korea Expressway Corporation, 18, pp. 71-109.
- Y.K.Kim, H.C.Kim, J.H.Yu (2003) A study on the drilling methods to reduce overbreak in tunnel blasting, Journal of the Korean Society of Explosices and Blasting Engineering, 21(2), pp. l-13.
- S.W. Kim (1999) Measure of overbreak when tunnel drilling and blasting, Journal of the Korea Expressway Corporation, pp. 391-394.
- Korea Rail Network Authority (2011) Rail design standard specification.
- Y.N. Jung (2016) Prediction model of vibration propagation near vicinity ground around bridge pier considering soil properties and foundation, Master's Thesis, Paichai University.
- S.I. Kim, J.W. Kwak, S.P. Jang (1999) Resonance phenomenon according to the relationship between span length of the bridge and effective beating interval of high-speed train, Journal of the Earthquake Engineering Society of Korea , 3(2), pp. 67 - 76
- S.I. Kim, W.S. Jung, E.S. Choi (2005) A study on the optimal span length selection of conventional railway bridges considering resonance suppression, Journal of the Korean Society for Railway, 8(2), pp.137 - 144
- J.W. Oh (2005) Dynamic behavior and resonance reduction of two-span continuous bridges for Korean train express, Journal of the Korean Geotechnical Society, 28(1), pp. 95-104.
- J.H. Yoon, K.Y. Choi, K.S. Kwon, W.S. Jung (2012) Effect of crossbeam on dynamic characteristic and safety of PSC-I railway bridge, Journal of the Korean Society of Hazard Mitigation, 12(4), pp. 25 - 30 https://doi.org/10.9798/KOSHAM.2012.12.4.025
- M.T. Bui (2009) Influence of some particle characteristics on the small strain response of granular materials, Ph.D dissertation, The University of Southampton.
- H.B. Seed, R.T. Wong, I.M. Idriss, K. Tokimuatsu (1986) Moduli and damping factors for dynamic analyses of cohesionless Soils, J. Soil Mech. and Found. Div., ASCE, 112(11), pp. 1016-1032.
- B.O. Hardin, V. Drenevich (1972) Shear modulus and damping in soil: design equation and curves, J. Soil Mech. and Found. Div., ASCE, 98(7) pp. 667-692.
- B.O. Hardin, V. Drenevich (1972) Shear modulus and damping in soil: measurement and parameter effects, J. Soil Mech. and Found. Div., ASCE, 98(7), pp. 603-624.
- H.B. Seed, R.T. Wong, I.M. Idriss, K. Tokimuatsu (1984) Moduli and damping factors for dynamic analyses of cohesionless soils, University of California, Earthquake Engineering Research Center Report, No. UCB/EERC-84/14.
- M. Vucetic, R. Dobry (1991) Effect of soil plasticity on cyclic response, Journal of Geotechnical Engineering, 117(1), pp. 89-107. https://doi.org/10.1061/(ASCE)0733-9410(1991)117:1(89)
- M.B. Darendeli, K.H. II Stokoe (1997) Dynamic properties of soils subjected to the 1994 Northridge earthquake, University of Texas, Geotechnical Engineering Report GR97-5.
- K. Ishihara (1996) Soil behavior in earthquake geotechnics, Oxford University Press, Oxford.
- K. Ishibash, X. Zhang (1993) Unified dynamic shear moduli and damping ratios of sand and clay, Soils and Foundations, 33(1), pp. 182-191. https://doi.org/10.3208/sandf1972.33.182
- K. Kwon, D. Kim (2000) Alternative method of determining resilient modulus of subbase materials using fee-free Resonant Column Test, Journal Korean Society of Road Engineers, 2(2), pp. 149-161.
- Cost per construction work standard (2017), Korea institute of civil engineering and building technology, http://www.codil.or.kr/ (Accessed 1 February 2017).
- F.Y. Menq (2003) Dynamic properties of sandy and gravelly soils, PhD dissertation, The University of Texas at Austin.
- T. Wichtmann, T. Triantafyllidis (2009) On the influence of the grain size distribution curve of quartz sand on th esamll strain shear modulus Gmax, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 135(10), pp. 1404-1418. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000096
- C. S Park (2008) Evaluation of resilient modulus and quality control procedure for railroad trackbeds based on dynamic properties, PhD dissertation, KyungHee University.
- Y.J. Lim, S.H. Lee, J.W. Lee, H.J. Cho (2012) Evaluation of dynamic properties of crushed stones used as reinforced trackbed foundation materials using midsize resonant column test apparatus, Journal of the Korean Society for Railway, 5(5), pp.476-484.
- D.S. Kim, Y.W. Choo (2001) Dynamic deformation characteristics of cohesionless soils in Korea using resonant column tests, Journal of the Korea Geotechnical Engineering, 17(5), pp. 115-128
- H.B. Seed, I.M. Idriss (1970) Soil moduli and damping factors for dynamic response analyses, University of California Earthquake Engineering Research Center, Report No. EERC-70-10.
- C.R. Choi (2012) Nonlinear Deformational characteristics of sedimentary rock mass for seismic analyses of tunnels, PhD dissertation, KyungHee University.
- Korea Rail Network Authority (2015) Track maintenance guidelines.