Numerical and physical modeling of geofoam barriers as protection against effects of surface blast on underground tunnels

De, Anirban; Morgante, Alberto N.; Zimmie, Thomas F.

doi:10.1016/j.geotexmem.2015.06.008

Cited by 77 publications

(18 citation statements)

References 31 publications

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“…It was recommended that, to create a blast resistant tunnel design, an increase in the lining thickness shall be a viable option. De et al [37] suggested the geofoam material to be placed directly above the structure to prevent it against blast load. It was observed that the measured stresses, strains and pressures at the top of the tunnel found decrease when the protective geofoam barrier's thickness was increased.…”

Section: Influence Of Lining Materials In Tunnelmentioning

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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Section: Influence Of Lining Materials In Tunnelmentioning

confidence: 99%

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

Senthil¹,

Sethi²,

Pelecanos³

2021

JSEAM

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“…6, when charge reached 300 kg the stress reached the tunnel is more than the ultimate compressive strength of concrete 50 MPa. At great charges a protection like layers of foam or RC slab should be created for the tunnel to reduce energy conveyed to it, [16,37].…”

Section: Effect Of Weight Of Tntmentioning

confidence: 99%

“…The destructive effects of blast loads have directed many investigators to study how the explosions affect the response of structures and the methods to dilute the risks using both tests and simulation models. The damage mode of tunnels in both dry and saturated soil were studied through experimental and numerical studies of blast loads [9][10][11][12][13][14][15]. The explosions tests are very limited due to their complexity and high cost.…”

mentioning

confidence: 99%

Numerical analysis of underground tunnels subjected to surface blast loads

Nawar

Ata

Nabil

et al. 2020

Frattura Ed Integrità Strutturale

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The increased terrorist attacks on important public structures and utilities have raised the vital necessity for the investigation of performance of structures under blast loads to improve the design and enhance the behavior of structures subjected to such threats. In this study, 3-D ﬁnite element analysis is used to study the effect of surface explosions on the response of RC bored tunnels. The soil behavior is modelled using Drucker-Prager Cap model. Two types of soil are investigated, and the blast load is considered through various weights of TNT explosive charges at heights of 0.50 m and 1.0 m from ground surface. To study the effect of horizontal standoff distance, six different horizontal distances are considered. The results show that the soil type has a significance effect on tunnel response due to surface blasts. Also the weight and the location of charge have a great effect on the safety of the tunnel. Finally, a parametric study is established to define the borders of the restricted area around the tunnel location to be safe.

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“…Using the artificial gravity field generated by a centrifuge, a large explosion can be simulated with fewer explosives [9]. erefore, scholars have established centrifuge models to evaluate how surface explosion affects underground structures [10]. Also, as the processing capability of computers has grown, numerical simulations have entered widespread use in this field.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Dynamic Responses and Cumulative Damage of Underground Caverns under Multiple Explosions

Wang

Cao

Dun

et al. 2020

Shock and Vibration

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Attacking underground caverns with earth-penetrating bombs usually involves multiple explosions in succession. To assess the dynamic responses and cumulative damage of underground caverns under multiple explosions, based on a reduced-scale physical model test, the modified Riedel–Hiermaier–Thoma (RHT) model in the finite-element software LS-DYNA is used to build an underground cavern model that encounters four explosions above the vault. The characteristics of the stress wave attenuation and the evolution laws for the cumulative damage of the surrounding rock in the process of the four explosions are presented. Also, the displacement of the vault, the strain of the cavern wall, and the damage of a rock bolt-supported cavern and an unanchored cavern are compared. The results indicate that the peak pressure is attenuated increasingly in the latter three explosions. The circumferential strain of the cavern wall changes from tensile to compressive from the vault to the corner. The damage of the surrounding rock on the left and right sides of the explosion source is attenuated with increasing distance from the explosion source, and the attenuation curve has a reverse “S” shape. Moreover, the attenuation rate of the curve decreases with each explosion. Multiple explosions do not affect the size of the crushed zone, but they do increase the range of the fracture zone. With each explosion, the cumulative damage of the surrounding rock increases irreversibly, but the damage increment decreases. The cumulative damage of the surrounding rock exhibits a highly nonlinear relationship with successive explosions, and the effect of the rock bolt reinforcement becomes more obvious with successive explosions. Accordingly, the present research results offer a reference for antiexplosion design and support the optimization of underground engineering.

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Numerical and physical modeling of geofoam barriers as protection against effects of surface blast on underground tunnels

Cited by 77 publications

References 31 publications

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

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

Numerical analysis of underground tunnels subjected to surface blast loads

Numerical Simulation of the Dynamic Responses and Cumulative Damage of Underground Caverns under Multiple Explosions

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