On the internal blast loading of submerged floating tunnels in concrete with circular and rectangular cross-sections

Kristoffersen, Martin; Minoretti, Arianna

doi:10.1016/j.engfailanal.2019.04.074

Cited by 52 publications

(27 citation statements)

References 53 publications

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“…Compared with other structures (e.g., bridges and immersed tube tunnels) of cross-water transportation, the main benefits of the submerged floating tunnel include (Jiang et al, 2018;Kim and Kwak, 2022;Kwon et al, 2022): (i) it is suspended at a certain depth underwater so that it does not affect the water surface navigation and is basically unaffected by the adverse weather (e.g., strong breeze) on the water surface (compared with bridges); (ii) its engineering layout position is relatively shallow so that the construction angle and length of the structures are smaller and the effect of complex seabed topography (e.g., submarine canyon) can be ignored (compared with immersed tube tunnels); (iii) its structural features of prefabricated segmental connection are not limited by the water depth and structure span so that the construction stability is easier to guarantee. The above benefits of submerged floating tunnels show potential and competitiveness in the technical solutions of cross-water transportation, which currently has become a research hotspot in industry and academia (e.g., Ingerslev, 2010;Martinelli et al, 2011;Kristoffersen et al, 2019;Jin and Kim, 2020;Yang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Feasibility of submerged floating tunnel with polygonal cross-sections — investigation from a viewpoint of submarine slide hazards

Fan

et al. 2023

Front. Mar. Sci.

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Recently, submerged floating tunnels have generated a lot of interest due to their unique cross-water traffic benefits. However, the destructive threat of submarine slide hazards was not fully considered in the design scheme of submerged floating tunnels, in particular to the feasibility of applying various cross-section forms on land to submerged floating tunnels under that hazard influence. This study mainly investigates the load effect of submerged floating tunnels with polygonal cross-sections (comprising three types: square, hexagon, and octagon) under the impact of submarine slides, via a computational fluid dynamics (CFD) approach. Results show that the impact forces produced by submarine slides on submerged floating tunnels are significant (e.g., submarine slides with a velocity of 4 m/s may produce a force level near 1×105 N/m), where the horizontal impact force components should be given priority consideration based on the general working environment of submerged floating tunnels. Compared with typical circle tunnels, polygonal tunnels suffer higher impact forces, and the polygonal types with fewer edges show a greater impact force. Finally, a simplified force evaluation approach for the submerged floating tunnel with polygonal cross-sections is proposed for guiding the relevant engineering design.

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Section: Introductionmentioning

confidence: 99%

Feasibility of submerged floating tunnel with polygonal cross-sections — investigation from a viewpoint of submarine slide hazards

Fan

et al. 2023

Front. Mar. Sci.

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“…Studies on understanding the effects of internal blast on tunnel have been carried out in the past which included detailed parametric studies [1][2][3][4][5]. However, most of the studies are focused on a straight segment of the tunnel neglecting the curvature aspect of the structure.…”

Section: Introductionmentioning

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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“…The tragic collision of two trucks on the Casalecchio (close to Bologna, Italy) junction of the A14 highway that occurred on August 6 th 2018 can be regarded as an example of this kind of scenario: both trucks loaded with flammable materials (GPL and chemical solvents) triggered a chain of explosions that gutted the overpass, causing two deaths and 145 injuries. A recent study conducted by Kristoffersen et al [23] analysed the response of SFTs with circular and rectangular cross-sections, subjected to internal explosion without fire using a finite element (FE) approach.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the structural response of RC slabs subjected to combined fire and blast

et al. 2021

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On the internal blast loading of submerged floating tunnels in concrete with circular and rectangular cross-sections

Cited by 52 publications

References 53 publications

Feasibility of submerged floating tunnel with polygonal cross-sections — investigation from a viewpoint of submarine slide hazards

Feasibility of submerged floating tunnel with polygonal cross-sections — investigation from a viewpoint of submarine slide hazards

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

Experimental investigation on the structural response of RC slabs subjected to combined fire and blast

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