Seismic Waves Scattering Impact through Tunnel Excavation on Adjacent Monuments Subjected to Far Field Earthquakes

Ehsan Ghobakhloo, Mahyar Pourlak, Arash Razmkhah




Abstract


The study of the effect of seismic wave scattering has attracted extensive attention in the past couple of decades especially in infrastructures like tunnels. A seismic wave, meeting the tunnel, can generate scattering which, in most cases, may incur damages in adjacent structures. In this study, using Finite Element Method (FEM), the effect of seismic wave scattering in far field has been investigated. The twin tunnels of Shiraz subway system are selected as the case study in this research and three far field seismic waves were chosen for time history analyses. Investigating the normal mode (before tunnel construction) in comparison to the excavation mode (after tunnel construction) enables calculation of the effect of displacement in adjacent structures. The analysis results indicate there is a significant difference between before and after tunnel construction (P-value<0.05). Accordingly, the influence of constructing a tunnel on adjacent surface structures is very important for tunnel design.


Keywords


Scattering of wave; twin tunnel; incident wave direction

References


  1. Pao, H.Y. and Mow, C.C., The Diffraction of Elastic Waves and Dynamic Stress Concentrations, Rand Corporation, USA, 1971.
  2. Lee, V.W. and Trifunac, M.D., Response of Tunnels to Incident SH-Waves, J. Eng. Mech. Div ASCE, 108, 1982, pp. 1-17.
  3. Antonio, J. and Tadeu, A., 3D Scattering by Multiple Cylindrical Cavities Buried in an Elastic Formation, Eur. J. Mech. A/Solids, 20, 2001, pp. 367-383.[CrossRef]
  4. Wang, J.H., Zhou, X.L., and Lu, J.F., Dynamic Stress Concentration around Elliptic Cavities in Saturated Poroelastic Soil under Harmonic Plane Waves, International Journal of Solids and Structures, 42, 2005, pp. 4295-4310.[CrossRef]
  5. Esmaeili, M., Vahdani, S., and Noorzad, A., Dynamic Response of Lined Circular Tunnel to Plane Harmonic Waves, Tunnelling and Underground Space Technology, 21, 2006, pp. 511-519.[CrossRef]
  6. Lu, J.F., Jeng, D.S., and Lee, T.L., Dynamic Response of a Piecewise Circular Tunnel Embedded in a Poroelastic Medium, Soil Dynamics and Earthquake Engineering, 27, 2007, pp.875-891.[CrossRef]
  7. Zhou, X.L., Jiang, L.F., and Wang, J.H., Scattering of Plane Wave by Circular-Arc Alluvial Valley in a Poroelastic Half-Space, Journal of Sound and Vibration, 318, 2008, pp. 1024-1049.[CrossRef]
  8. Zhou, X.L., Wang, J.H., and Jiang, L.F., Dynamic Response of a Pair of Elliptic Tunnels Embedded in a Poroelastic Medium, Journal of Sound and Vibration, 325, 2009, pp. 816-834.[CrossRef]
  9. Jiang, L.F., Zhou, X.L., and Wang, J.H., Scattering of a Plane Wave by a Lined Cylindrical Cavity in a Poroelastic Half-Plane, Computers and Geotechnics, 36, 2009, pp. 773-786.[CrossRef]
  10. Bin, L., Kang He, X., and Xiaohu, L., Dynamic Response of a Partially Sealed Tunnel in Porous Rock under Inner Water Pressure, Tunnelling and Underground Space Technology, 25, 2010, pp. 407-414.[CrossRef]
  11. Afifipour, M., Shrifzadeh, M., Shahriar, K., and Jamshidi, H., Interaction of Twin Tunnels and Shallow Foundation at Zand Underpass, Shiraz Metro, Iran, Tunneling and Underground Space Technology, 26, 2011, pp. 356-363.[CrossRef]
  12. Brinkgreve, R.B.J. and Broere, W., Plaxis Dynamics Manual (ver 8.5), Delft University of Technology and Plaxis b.v., Netherlands, 2006.
  13. Standard No. 2800–05 (3rd Edition), Iranian Code of Practice for Seismic Resistant Design of Building, Building and Housing Research Center, 2005. (In Persian).
  14. Mann, H.B. and Whitney, D.R., On a Test of Whether One of Two Random Variables is Stochastically Larger than The Other, Annals of Mathematical Statistics, 18(1), 1947, pp. 50–60.
    [CrossRef]


Full Text: PDF

Instructions for Preparing Papers for CED.docx
The Journal is published by The Institute of Research & Community Outreach - Petra Christian University.

©All right reserved 2016.Civil Engineering Dimension, ISSN: 1410-9530, e-ISSN: 1979-570X

 

View My Stats


Copyright © Research Center Web-Dev Team