Finite-Element Studies on Factors Influencing the Response of Underground Tunnels Subjected to Internal Explosion

Ramakrisnan, Prasanna; Boominathan, A.

doi:10.1061/(asce)gm.1943-5622.0001678

Cited by 18 publications

(13 citation statements)

References 29 publications

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“…The lining thickness of 750 mm proved to be adequate against the blast produced by greater TNT charge carried within a small delivery truck, for all considered burial depth of 4, 6 and 8 m, see Table 4 and 5. Prasanna and Boominathan [48] found that increasing tunnel lining thickness from 250 to 450 mm, a maximum reduction of 40% in the displacement of RC lining takes place in case of circular tunnels. Mandal et al [63] investigated the nonlinear behavior of reinforced concrete constituting the tunnel lining subjected to a surface blast.…”

Section: Influence Of Tunnel Lining Thicknessmentioning

confidence: 98%

“…It is also for the reason that the BFRP bars experience lesser deflections as well as distribution of cracks, as compared to steel bars. Prasanna and Boominathan [48] compared the performance of RCC tunnels with that of cast iron tunnels subjected to internal explosion. It was observed that due to the greater stiffness and density of cast iron tunnels, lesser damage was caused to cast iron tunnels as compared to RCC tunnels (see Table 2).…”

Section: Influence Of Lining Materials In Tunnelmentioning

confidence: 99%

“…Mandal et al [63] found that 10% decrease in peak displacement value for a tunnel with circular cross section because less reflected pressure waves are generated on a circular surface as compared to box shaped and horseshoe shaped surface, facing the explosive. Prasanna and Boominathan [48] found that the largest vertical displacement occurs in case of box shape tunnel as compared to circular and horse-shoe shaped tunnel and a reason that in case of box shape tunnel, the load transfer is controlled by bending that causes a significant reduction in the load carrying capacity. The distribution of plastic deformation for circular tunnels is all around the lining whereas box shape and horseshoe shaped tunnel, the distribution of plastic deformation is concentrated around corners and side walls.…”

Section: Influence Of Shape Of Tunnelsmentioning

confidence: 99%

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A review on the performance of the underground tunnels against blast loading

Senthil¹,

Sethi²,

Pelecanos³

2021

JSEAM

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The tunneling system has become an important part of the present infrastructure system in all over the world. Therefore, it has become important to ensure the safety of the tunnels against any type of man-made blasting activities or other accidental blasting occurrence. In order to evaluate the performance of the tunnels against blast loading, a detailed review is carried out. Based on the review in the last couple of decades, the various parameters such as tunnel lining materials, tunnel shapes, tunnel lining thickness, tunnel burial depth, charge weight and standoff distance are high influences on the performance of underground tunnels against blast loading. It was observed that the tunnel roof and the tunnel wall center are most vulnerable to the blast loads. Also, it was found that more of the tunnel lining thickness results in lesser deformation at the tunnel roof and the tunnel wall center. The increase in the burial depth of the tunnel would reduce the extent of damage to the tunnel caused by effects of surface blast loading. The stiffness and strength of the ground media may be enhanced against the effects of blast loading by grouting measures. The studies revealed that the lining materials possessing blast waves absorbing properties can be best suited to be used in tunnel linings. Further, it was observed that more damage was caused to the tunnels due to the magnitude of the charge weight. An increase in the blast load causes a significant increase in the fracture area, residual stress and lateral displacement caused to the tunnel by the action of blast load. The standoff distance of the blast load from the tunnel also plays a significant role in the damage of the tunnel. More is the distance between the charge and the tunnel, lesser damage caused to the tunnels. In addition to that, the lining thickness was predicted and the trend was calibrated and fitted logarithmically with the available results. Based on the observation from the literature, it is concluded that the use of a single lining material in the tunnel against blast loading was studied predominantly in the couple of decades. Further, the performance of the tunnels in combination of different tunnel lining materials against blast loading was found limited. The influence of barriers to save the underground tunnels against blast loading was found limited.

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Section: Influence Of Tunnel Lining Thicknessmentioning

confidence: 98%

Section: Influence Of Lining Materials In Tunnelmentioning

confidence: 99%

Section: Influence Of Shape Of Tunnelsmentioning

confidence: 99%

See 1 more Smart Citation

A review on the performance of the underground tunnels against blast loading

Senthil¹,

Sethi²,

Pelecanos³

2021

JSEAM

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“…Prasanna and Boominathan [5] conducted a numerical study on the factors influencing the response of underground tunnels subjected to internal blasts using the finite element method. They studied the effect of the blast on variables that included the material, thickness and shape of the lining.…”

Section: Introductionmentioning

confidence: 99%

Determination of Blast Impact Range and Safe Distance for a Reinforced Concrete Pile Under Blast Loading

Khodaparast

Hosseini

Moghtadaei

2023

IJE

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Piles transfer structural loads to the hard layers of the soil or rock; thus, any damage to the pile foundations could have irreparable consequences. A surface blast can create a ground shock that transmits the blast energy along the surface and at depths. Explosion research necessitates technical design to mitigate the adverse effects on nearby structures and facilities. The blast impact range and the safe distance at which the pile will avoid structural damage are two critical parameters for the design of a pile under blast loading. Therefore, this study used the coupled Eulerian-Lagrangian method to determine the blast impact range and safe distance for reinforced concrete piles (RC piles) subjected to blast loading. The results for clayey and sandy soils revealed that an increase in the explosive depth had no significant effect on the safe distance, despite a decrease in the compressive and tensile damage to the pile. Increasing the mass and depth of the blast decreased the ultimate compressive bearing capacity of the pile and increased the blast impact range. Sandy soil performed better than clayey soil against blast loading. The findings of this study can be applied to various projects, including critical structures near gas transmission lines or vulnerable to terrorist attacks.

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“…However, nowadays, fire cannot be regarded as the only extreme accidental action: recent terroristic attacks have raised the doubt that tunnel infrastructures can also be regarded as critical targets, not only for significant life losses, but also for the huge overall costs to society, that critical damage to this kind of infrastructure can induce. Over the last decade, several researchers started to examine the behaviour of tunnels (particularly metro tunnels) subjected to internal explosion encompassing both simplified and refined numerical models [16] [17] [18][19] [20] [21] [22][23] [24] [25]. At present, there are no experimental studies reported in literature on the topic of tunnels subjected to internal blast loads.…”

Section: Introductionmentioning

confidence: 99%