A numerical study of the evolution of the blast wave shape in tunnels

Benselama, Adel M.; William-Louis, Mame; Monnoyer, F.; Proust, Christophe

doi:10.1016/j.jhazmat.2010.05.056

Cited by 45 publications

(32 citation statements)

References 10 publications

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“…This location depends on the quantity of explosive and on the geometry. It can be deduced from the following equation (Benselama et al, 2010):…”

Section: Resultsmentioning

confidence: 99%

“…So, by knowing the transition zone between those two dierent propagation patterns, one can determine the incident overpressure at any location in the tunnel. This was investigated by [3], who proposed a suitable law to locate the transition zone issued from numerical simulations of the detonation of TNT in a tunnel. [3] also showed that planar waves can spread over long distances with small damping eects on the incident overpressures.…”

Section: Introductionmentioning

confidence: 99%

“…This was investigated by [3], who proposed a suitable law to locate the transition zone issued from numerical simulations of the detonation of TNT in a tunnel. [3] also showed that planar waves can spread over long distances with small damping eects on the incident overpressures. So, the spatial evolution of the incident overpressure shows a less steep slope than in the spherical case.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical and reduced-scale experimental investigation of blast wave shape in underground transportation infrastructure

Pennetier

William-Louis

Langlet

2015

Process Safety and Environmental Protection

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When an explosion occurs in a tunnel, the study of the blast wave quickly becomes complicated, owing to the multiple propagation patterns of the blast wave (Incident wave, regular and Mach reections) and to the geometrical conditions. Considering this problem, two patterns can be revealed. Near the explosive, the well known freeeld pressure wave can be observed. After multiple reections on the tunnel's walls, this overpressure behaves like a one-dimensional (1D) wave. One aim of this paper is to determine the position of this transition spherical-to-planar wave propagation in a tunnel using both numerical and reduced-scale experiments, and thereby validate the dedicated law established in a previous work.For this purpose, a detonation of TNT in a tunnel with a cross-section of up to 55 m 2 is considered. Results show good agreement between the numerical simulations and experiments. The transition zone between the three-dimensional (3D) and the 1D wave is well detected. An application to a simplied subway station is also investigated which shows that signicant planar waves can be transmitted to the neighboring stations via the junction tunnels.

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“…This location depends on the quantity of explosive and on the geometry. It can be deduced from the following equation (Benselama et al, 2010):…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical and reduced-scale experimental investigation of blast wave shape in underground transportation infrastructure

Pennetier

William-Louis

Langlet

2015

Process Safety and Environmental Protection

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“…First is a period of spherical pressure wave propagation and its interaction with the structure in the near-field. After a distance of 4∼6 times' radii from the explosive centre, it evolves into second phase; that is, after complicated interactions in first phase the blast wave propagates along tunnel axis like a 1-dimensional plane wave [22,23]. Therefore, the loading on the tunnel from inner explosion is quite complicated.…”

Section: The Description Of Blast Loads Due To a Centric Point-sourcementioning

confidence: 99%

Vibration of a Cylindrical Tunnel under a Centric Point-Source Explosion

Zhao

Chen

Vafeidis

et al. 2017

Shock and Vibration

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Underground tunnels are vulnerable to terrorists' bombing attacks, which calls for studies on tunnel's response to internal explosive loading. In this paper, the dynamic response of a cylindrical tunnel to an ideal centric point explosion was treated as an axisymmetric 2-dimensional problem, in which the tunnel was modeled with a continuous anisotropic shell, while the ground medium's effect was accounted for with linear elastic Winkler springs and the explosive loading described by a temporal and spatial function. The governing equation of the motion is a fourth-order partial differential equation, for which a numerical method combining finite difference with the implicit Newmark-method was adopted. This method avoided complicated integral transform and numerical inverse transformation, thus allowing efficient parameter study. The maximum radial displacement was found on the cricle of the center of explosive, where hoop stress is the maximum principal stress. The anisotropy showed little influence on maximum hoop stress. Within the range of ground medium's modulus, minor influence on maximum hoop stress was incurred. This research may be helpful to hazard assessment and protective design for some critical subway tunnels.

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“…The space in tunnel is modeled by the hexahedron grid unit, which is defined as the Euler hexahedron filled with ideal air. The explosive source is applied as an ideal spherical TNT explosive defined by the Jones-Wilkins-Leeequation of state equation [7,8]. ALE method is used to define the interface between the Lagrange and Euler units.…”

Section: Composite Shell Simulation Modelingmentioning

confidence: 99%

Response Analysis of Composite Shell with Various Fixation Patterns under Axial Impact Load in Tunnel

Song¹,

Wei²

2017

dteees

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Abstract. The safety equipment will against the explosive load when a disaster occurs in tunnel. This analysis of composite shell establishes a model of the relation among initial velocity, explosive load, plastic strain and shell fixation pattern, which is used to study the plastic strain of composite shell under different fixation patterns. The result shows that the fixation pattern plays a great part in the plastic strain of composite shells under axial impact load in tunnel. It is clearly that the extreme value and distribution range of plastic strain can be controlled by changing the fixation pattern. If the fixed point of composite shell is axisymmetric, the extreme value of plastic strain will decrease. Meanwhile, the distribution ranges of it remaining the same level. It is also confirmed that the plastic strain of fixed area which is far away from the explosion is more sensitive than the closer one to impact load.

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A numerical study of the evolution of the blast wave shape in tunnels

Cited by 45 publications

References 10 publications

Numerical and reduced-scale experimental investigation of blast wave shape in underground transportation infrastructure

Numerical and reduced-scale experimental investigation of blast wave shape in underground transportation infrastructure

Vibration of a Cylindrical Tunnel under a Centric Point-Source Explosion

Response Analysis of Composite Shell with Various Fixation Patterns under Axial Impact Load in Tunnel

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