The response of rock tunnel when subjected to blast loading: Finite element analysis

Zaid, Mohammad; Sadique, Md. Rehan

doi:10.1002/eng2.12293

Cited by 28 publications

(8 citation statements)

References 32 publications

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“…For RC tunnels, detonation induced pressure on the tunnel lining, and the distortion of the tunnel lining and the surrounding soil increases as the charge weight increases [31,33]. For deep tunnels, this effect is more trivial than in shallow tunnels [34].…”

Section: Previous Numerical Studiesmentioning

confidence: 99%

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Effect of Blasts on Underground Tunnels- An Overview

Ata

Tolba

Amin

et al. 2022

The Egyptian International Journal of Engineering Sciences and

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st blast loads 2 nd underground tunnels 3 rd soil dynamic 4 th numerical analysis Terrorist actions and defacements have become one of the widest threaten for humans and structures. Underground tunnels can be used as shelters against blast, so it is very important to study their behavior under blast loads. The safety of tunnels is lean because of the lack of suitable ways to discover these events early. Techniques are essential to quantify the resistance of underground structures against blasts as a protection and to calculate the risks caused by the failure of their elements. The appropriate advanced methods could be experimental, numerical, or a mixture of both. The experimental work is limited because of the cost and complication, and so numerical analysis is suitable for blast study in addition to available experimental tests. The parameters affecting the safety of tunnels such as the weight of explosive, lining material and thickness, soil stiffness, burial depth, thickness cover, shape of a tunnel, diameter of the tunnel, the standoff distance, the location of blast charge and also the effect of one tunnel to another in case of twin tunnel discussed by various researchers have been overviewed in the present work. The paper presents an overview of the effect of blast on tunnels for beginner researchers and structural engineers to understand such complex loading situation. New strategies which can be adapted to mitigate the effect of surface and internal blast loads on shallow and deep tunnels should be investigated. Studies should use numerical simulation of a tunnel buried in a saturated soil profile to imitate realworld conditions.

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Section: Previous Numerical Studiesmentioning

confidence: 99%

“…As the diameter of the tunnel increases, the distance between the TNT charge and the concrete lining increases, which reduces the deformation in the tunnel lining. The deformation vs. weight of the TNT profile distinguishes clearly with an increase in the diameter of tunnel lining [34,35].…”

Section: Previous Numerical Studiesmentioning

confidence: 99%

Effect of Blasts on Underground Tunnels- An Overview

Ata

Tolba

Amin

et al. 2022

The Egyptian International Journal of Engineering Sciences and

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“…Similarly, significant reduction in the wall displacement was observed when the burial depth increased from 4 to 8 m. Li et al [70] suggested that as the burial depth of underground tunnels increases, the tunnel experiences a higher in situ stress level, causing more strain energy to get accumulated at the tunnel periphery, see Table 8. Zaid and Sadique [71] studied the behavior of rock tunnels subjected to blast loading. For charge weight equal to 60kg, it was observed that occurrence of deformation in the lining decreases by 70-73% when the burial depth of the tunnel increases from 5 to 7.5 m. Increasing the burial depth from 7.5 to 10 m, causes a decrease in the lining deformation by 23-28%.…”

Section: Influence Of Burial Depth Of Underground Tunnelsmentioning

confidence: 99%

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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“…Three-dimensional finite element analysis has been carried out in the present study to investigate the response of underground shallow unlined tunnels in rock medium subjected to blast load. Elastoplastic behaviour of the rock has been considered adopting Mohr-Coulomb constitutive material model, which is based on the assumption that failure occurs when maximum shear stress value is reached [15,39,40]. This shear stress depends linearly on the normal stress and both lie in the same plane.…”

Section: Constitutive Materials Modelmentioning

confidence: 99%

“…Moreover, the assessment of the damage caused by an explosion in the underground tunnel is the uphill struggle due to multiple reflections of shock waves [5]. However, several scientists and researchers had studied the stability of tunnel under dynamic loading [6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%