Local damage of the RC tunnels under ballistic missile impact investigated by finite element simulations

Thai, Duc‐Kien; Tú, Trần Minh; Phan, Quang-Minh; Pham, Thai‐Hoan

doi:10.1016/j.istruc.2021.01.092

Cited by 6 publications

(1 citation statement)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Examples of experimental, analytical, and numerical studies related to impact loading on different materials (metals, concrete, soil, rock, and rubber) individually can be found in the literature, although these studies conducted in the past related to impact loading on metals and geomaterials separately [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. At present, there is a rise in experimental and numerical studies associated with tunnels subjected to impact loading [4,[24][25][26][27][28][29][30][31][32][33]. However, these studies are mostly related to the study of crack propagation, deformation on the tunnel lining, and rock mass properties.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of a High-Velocity Projectile’s Impact on Shallow Steel Tunnels in Soft Sandstone

Sarmah,

Dutta,

Rao

2024

Infrastructures

View full text Add to dashboard Cite

Tunnels are underground infrastructures intended for diverse community applications as well as military applications. During impact loading due to high-velocity projectiles such as ballistic missiles, materials experience a high strain rate. Moreover, there is a superficial augmentation of the dynamic strength when geomaterials such as rock are subjected to a high strain rate. Despite this strength enhancement, tunnels can get damaged by the impact load of a projectile hitting at a high velocity if they are present at a shallow depth. The present study is an effort to comprehend the response of a shallow tunnel in soft sandstone due to the impact load by a ballistic projectile using the FEM-based software ABAQUS/CAE 6.11. The Drucker–Prager damage model and the Johnson–Cook damage model were used to define the properties of the rock mass and steel tunnel lining, respectively. The crown of the 3 m diameter tunnel was kept at different depths from 1 m to 5 m from the surface. A striking velocity of 1000 m/s at a normal position to the target was given to the projectile. The projectile caused noticeable damage to the tunnel lining up to 3 m crown depth. Increasing the crown depth had a positive effect on the maximum depth of the projectile penetration up to 4 m tunnel crown depth, after which the effect reversed, making the tunnel safer. The maximum von Mises stress on the tunnel lining reduced in a logarithmic trend with an increase in the crown depth, gradually lowering to an impact load lesser than the yield stress of the tunnel lining material after a crown depth of 4.5 m.

show abstract