Dynamic Analysis of Tunnel in Weathered Rock Subjected to Internal Blast Loading

Tiwari, Rohit; Chakraborty, Tanusree; Matsagar, Vasant

doi:10.1007/s00603-016-1043-8

Cited by 46 publications

(23 citation statements)

References 20 publications

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“…The failure would firstly occur at a location closest to the blast source and then gets extended further upto 10m away from the blast source. Tiwari et al [18] studied the damage caused to RC lining as well as the rocks surrounding the tunnel subjected to internal blast loading. It was observed that the higher stresses were generated in the rocks when a damage to RC lining occurs.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

Senthil¹,

Sethi²,

Pelecanos³

2021

JSEAM

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“…However, the vulnerability of the tunnel having different overburden depth and tunnel lining thickness had not been considered. Tiwari et al, 20 studied the effect of rock weathering for the rock tunnel subjected to blast loading. The finite element method was used for blast analysis, and they concluded that shock wave propagation is higher in less weathered rock.…”

Section: Introductionmentioning

confidence: 99%

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

Zaid

Sadique

2020

Engineering Reports

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In the past few decade tunnels were targeted to explosives and that resulted in sizeable structural damage. The increase in the strategic importance of tunnel construction has increased the demand for the blast‐resistant design approach. The present paper considered an internal blast loading on a rock tunnel constructed in Quartzite rock. A three‐dimensional finite element model of the tunnel has been developed in Abaqus. The diameter of the tunnel has been kept constant to a two‐lane transportation tunnel. However, the thickness of the concrete liner, depth of overburden, and mass of explosive charge has been varied to understand the response in different possible conditions. The Jones‐Wilkins‐Lee, Concrete Damage Plasticity, and Mohr‐Coulomb material models have been used for the modeling of trinitrotoluene, concrete, and rock respectively. Blast has been formulated through Coupled‐Eulerian‐Lagrangian technique. The tunnel at 12.5 of the depth of overburden has been found 2.7‐times more blast resistant than 5 m. Moreover, the extent of damage in shallow depth tunnels found to be more than the tunnels at higher depth of overburden.

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“…The effect of rock weathering in the tunnel also plays a pivotal role on the stability when subjected to internal blast loading. By using CEL method for blast simulation, it had been observed that weathering of rock has a significant consequence on the stability of the tunnel subjected to blast load [35]. Moreover, the attenuation of shock waves was observed for the rock having low modulus and a high degree of weathering.…”

Section: Introductionmentioning

confidence: 99%