Numerical Modeling of Shallow Buried Tunnel Subject to Surface Blast Loading

Mandal, Jagriti; Agarwal, Ajay Kumar; Goel, Manmohan Dass

doi:10.1061/(asce)cf.1943-5509.0001518

Cited by 34 publications

(23 citation statements)

References 23 publications

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“…Where, E = 0.25 MPa is the internal energy per initial volume, ρ is the relative density of air, ρ 0 =1 is the initial density of air, and γ = 1.4 is the ratio of specific heat. The density of air is taken as 1.29 kg/m 3 [9].…”

Section: Finite Element Modellingmentioning

confidence: 99%

Effect of Horizontal Curve on the Response of Road Tunnels under Internal Explosion

2022

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Internal explosion in a tunnel is a complex loading phenomenon where the tunnel lining is subjected to not only direct impact of explosion but also loading due to multiple reflection of blast waves which could be of magnitude higher than that of incident blast wave. This kind of loading is complex in nature and difficult to predict using simple analysis tools. Further, it poses a serious threat to its structural integrity. Studies have been conducted in the past to understand the behaviour of tunnel under internal explosion. However, they have been focused on straight tunnels ignoring the convex and concave shapes introduced due to horizontal and vertical curves. Shape of the target surface has significant effect on the characteristics of blast wave. This study investigates the effect of horizontal curves on the damage behaviour of tunnel lining due to internal explosion. A series of numerical simulation are performed on box-shaped tunnel with varying curvature radius and the results are compared with that of straight tunnel adopting Multi-Material Arbitrary Lagrangian-Eulerian (MM-ALE) method using LS-DYNA®. Explosive and air are modeled using ALE formulation, whereas, tunnel and soil are modeled using Lagrangian formulation. Further, Jones-Wilkins-Lee equation of state is used to model the explosion. Damage to the tunnel lining is measured in terms of peak particle velocity (PPV) and von-Mises stress. It is observed that walls of curved tunnels undergo more PPV compared with straight tunnel wherein concave wall show the highest PPV. Propagation of blast wave along the tunnel length is significantly affected due to the introduction of curvature resulting in change in reflection patterns. This further leads to variation in stress contours on tunnel lining with higher concentration of stress in curved tunnels than in straight tunnel.

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Section: Finite Element Modellingmentioning

confidence: 99%

Effect of Horizontal Curve on the Response of Road Tunnels under Internal Explosion

2022

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“…It was observed that arched as well as rectangular lining experienced 29.56% and 50.31% more displacement compared to the circular lining on the top node of the tunnel lining without any change in other parameters, see Table 3. 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.…”

Section: Influence Of Shape Of Tunnelsmentioning

confidence: 99%

“…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. It was observed that on increasing the tunnel lining thickness from 300 mm to 600 mm, the value of maximum displacement in the tunnel crown reduced from 43 mm to 30 mm, see Table 6.…”

Section: Influence Of Tunnel Lining Thicknessmentioning

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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“…Among them, Li et al (2018b) studied the blasting cracking mechanism associated with the lining structure of a gas-bearing tunnel and evaluated the cracking degree of the lining structure. Mandal et al (2020) focused on analyzing the blasting response modes and blasting limit capacity of tunnels with three different cross-section shapes. Sadique et al (2021) compared the acceleration, pressure, strain energy, lining axial force, deformation and damage patterns of the overall tunnel structure after blasting, and subsequently explored the blasting resistance of three rock types.…”

Section: Introductionmentioning

confidence: 99%

Disturbance and Control of National Strategic Gas Storage Induced by Adjacent Tunnel Blasting

Lin

Liu

et al. 2022

Front. Earth Sci.

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Underground gas storage are often subject to external dynamic loads, blast vibrations, and seismic disturbances, since they function as backup areas for the strategic national energy reserve, supply and demand dispatch, and gas and energy storage. Currently, the research on dynamic response characteristics, dynamic stability, and disturbance control of underground gas storages under dynamic loads is still incomplete and of great practical importance to ensure national strategic security. Therefore, this paper takes the blasting project of the Sansheng tunnel, which passes through the national strategic gas storage reservoir, as the engineering background. Based on the geological conditions and rock characteristics, the dynamic response characteristics of the rock surrounding the tunnel and gas storage are studied using the finite element method. The peak vibration velocity distribution of the surrounding rocks at different blasting source distances is analyzed and compared with the theoretical formula. Subsequently, an asymmetric uncoupled blasting vibration control technique is proposed and used for field blasting. The results show that the numerical results are consistent with the theoretical formula. The blasting vibration velocity decreases exponentially with an increase in the blasting source distance. Overall, the proposed technique significantly decreases the average peak vibration velocity by 22.64% compared to the original vibration velocity.

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Numerical Modeling of Shallow Buried Tunnel Subject to Surface Blast Loading

Cited by 34 publications

References 23 publications

Effect of Horizontal Curve on the Response of Road Tunnels under Internal Explosion

Effect of Horizontal Curve on the Response of Road Tunnels under Internal Explosion

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

Disturbance and Control of National Strategic Gas Storage Induced by Adjacent Tunnel Blasting

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