Scientific Quarterly Journal of Iranian Association of Engineering Geology

Scientific Quarterly Journal of Iranian Association of Engineering Geology

Investigation on projectile explosion effects in a jointed rock media by DEM: a case study of Ardebil-Mianeh railway tunnel

Document Type : Original Article

Authors
Hasan Hosseini Ranjbar 1
Morteza Esmaeli 2
Habib Shah Nazari 3
1 Department of Railroad Engineering, University of Science and Technology, Tehran, Iran
2 2. Department of Railroad Engineering, University of Science and Technology, Tehran, Iran
3 Department of Civil Engineering, University of Science and Technology, Tehran, Iran
Abstract
Consideration to explosion resistant design of special infrastructures has increased in the recent years. Amongst the various types of infrastructures, road and railway tunnels have a unique importance because their vital role in connection routes in emergency conditions. In this paper, the explosion effects of a projectile impacting on a railway tunnel located in jointed rock medium was investigated using DEM in two dimensions. For this purpose the UDEC as a well known DEM code was utilized for numerical modeling of the explosion phenomenon. In this regard in first step, selecting the GP2000 bomb as a usual projectile, the penetration depth and crater diameter were calculated in rock medium. In the second step, the blast pressure was calculated via empirical formulae and applied on the boundary of carter as input load. In continue the pressure wave propagation through the jointed rock medium was investigated. In part of the study a sensitivity analysis is carried out on jointed rock parameters such as joint orientation, dynamic modulus and damping ratio and their effect on tunnel lining axial force as well as bending moment were investigated.
Keywords
jointed rock medium
Blast loading
DEM
Subjects
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Scientific Quarterly Journal of Iranian Association of Engineering Geology
Volume 2, Number 3 & 4
March 2009
Pages 79-90

  • Receive Date 25 November 2009
  • Revise Date 19 June 2009
  • Accept Date 26 January 2011