3-D simulation of tunnel structures under blast loading

Buonsanti, Michele; Leonardi, Giovanni

doi:10.1016/j.acme.2012.09.002

Cited by 29 publications

(15 citation statements)

References 12 publications

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“…Actually, it even sounds possible to use a common power fit for both discontinuity locations. Finally, it has to be said that these laws are close to the law giving the transitional zone 3D-1D (5) found in [3] for square sections.…”

Section: D and 1dsupporting

confidence: 53%

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

Uystepruyst¹,

Monnoyer²

2015

Journal of Loss Prevention in the Process Industries

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When the explosion of condensed materials occurs in square or circular cross-section tunnel, the subsequent blast wave reveals two patterns: threedimensional close to the explosive charge and one-dimensional far from the explosion. Pressure decays for these two patterns have been thoroughly studied. However, when the explosion occurs in rectangular cross-section tunnel, which is the most regular geometry for underground networks, the blast wave exhibits a third, two-dimensional, patterns. In order to assess the range of these three patterns, several numerical simulation of blast waves were carried out varying the width and the height of the rectangular cross-section as well as the mass of the charge. Laws are presented to localize the transition zones between the 3D and the 2D patterns, and between the 2D and the 1D patterns, as functions of non-dimensional width and height. The numerical results of the overpressure are compared to existing 3D and 1D laws. An overpressure decay law is proposed to represent the 2D pattern. Knowing the two transition zones and the overpressure decays within these

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Section: D and 1dsupporting

confidence: 53%

“…This algorithm is validated by comparison with experimental data. Blast wave is a topical research subject as shown by the several recent works [10,12,11], and in particular confined blast wave [18,5]. One of the application of the confined domain is the underground network.…”

mentioning

confidence: 99%

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

Uystepruyst¹,

Monnoyer²

2015

Journal of Loss Prevention in the Process Industries

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“…The new control and security systems have been successfully used to monitor the internal blast inside a tunnel [3,4]. However, external explosions, unfortunately, are the most likely to achieve their purpose due to the absence of proper technology to detect these events before occurring [3,5,6]. In this research area, there are no records available for a field trial due to the difficulties to acquire such a study in terms of cost and safety.…”

Section: Introductionmentioning

confidence: 99%

Blast Damage Assessment of Symmetrical Box-Shaped Underground Tunnel According to Peak Particle Velocity (PPV) and Single Degree of Freedom (SDOF) Criteria

et al. 2018

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This study aimed to determine the reliability of the damage criteria that was adopted by the peak particle velocity (PPV) method and the single degree of freedom (SDOF) approach to assess the damage level of a box-shaped underground tunnel. An advanced arbitrary Lagrangian Eulerian (ALE) technique available in LS-DYNA software was used to simulate a symmetrical underground tunnel that was subjected to a surface detonation. The validation results of peak pressure into the soil revealed a good consistency with the TM5-855-1 manual within differences that were much less than previous numerical studies. The pressure contours revealed that the blast waves travelled into the soil in a hemispherical shape and the peak reflected the pressure of the tunnel that occurred immediately before the incident pressure reached its highest value. The assessment results proved that the criteria of the above methods could efficiently predict the damage level of a box-shaped tunnel under different circumstances of explosive charge weight and lining thickness at a depth of 4 m within slight differences that were observed during van and small delivery truck (SDT) explosions. However, the efficiency of both the methods was varied with the increase of burial depth. Whereas, using the PPV method significantly underestimated or overestimated the damage level of the tunnel, especially during SDT and container explosions with a lining thickness of 250 mm at burial depths of 6 and 8 m, respectively, the damage level that was obtained by the SDOF method greatly matched with the observed failure modes of the tunnel. Furthermore, new boundary conditions and equations were proposed for the damage criteria of the PVV method.

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“…Working specically on tunnels, [11] used LS-DYNA to study the mechanical behavior of subway stations made of concrete submitted to an explosion of 50 kg of TNT (trinitrotoluene). [7] used a nite element method to describe the behavior of a tunnel submitted to the blast generated by the explosion of an LPG (liqueed petroleum gas) tank, coupling the thermal and mechanical aspects. [28] also computed the consequences of a pressure vessel exploding in a tunnel system with branched ducts for smoke evacuation.…”

Section: Introductionmentioning

confidence: 99%

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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3-D simulation of tunnel structures under blast loading

Cited by 29 publications

References 12 publications

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

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

Blast Damage Assessment of Symmetrical Box-Shaped Underground Tunnel According to Peak Particle Velocity (PPV) and Single Degree of Freedom (SDOF) Criteria

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

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