Experimental and numerical investigation of the dynamic response of tunnel in soft rocks

Mishra, Swapnil; Kumar, Ankesh; Rao, K. Seshagiri; Gupta, Neelam

doi:10.1016/j.istruc.2020.08.055

Cited by 30 publications

(7 citation statements)

References 17 publications

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“…Its use is currently limited, due to its high costs and negative side effects. Mishra et al (2021) considered that the use of field tests to study the effect of explosions on tunnels is a very dangerous, expensive, and useless process in civilian research. Qian et al (2021) considered that field tests are very expensive and time-consuming.…”

Section: Field Testsmentioning

confidence: 99%

“…This method is widely used at the present time despite its high cost, the need for special equipment and the difficulty of forming rock models. It is a good alternative in order to overcome the difficulties of field experiments on a large scale (Mishra et al, 2021). In addition, it is necessary to conduct such tests since we are in the early stages of understanding the mechanism of rock failure due to explosions, (Liu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Simulation of blast-induced rock tunnel damage using a 3D numerical model

Salamy

Hammoud

2023

International Journal of Protective Structures

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The field tests conducted by the American Engineering Research Associates (ERA) provided important results about the distribution and extension of the damage zones and the failure area that occurred in unlined tunnels as a result of buried explosions in the rock mass surrounding these tunnels. Despite the importance of these results, they did not include specific values for the failure thickness and the fracture angle in the damaged tunnel sections. In the current study, a 3D numerical model is used to simulate one of ERA’s tests using ABAQUS. In this model, the impact of a buried explosion on a tunnel located at (5m) away from the center of the detonation is studied. The results of this model are in good agreement with the published results of ERA’s tests. In addition, the current numerical results give complete values for the change in the failure thickness and the fracture angle over the entire length of the damaged zones of the tunnel. The results of the current study show that the thickness of the failure remains almost constant beyond damage zone 1, while the angle of the fracture decreases remarkably as the charge-to-tunnel distance increases, which causes a decrease in the failure area.

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Section: Field Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of blast-induced rock tunnel damage using a 3D numerical model

Salamy

Hammoud

2023

International Journal of Protective Structures

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“…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

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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.

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“…Hui et al [18] adopted a manual opening model center to simulate tunnel excavation in a physical similarity simulation test. Mishra Swapnil et al [19] studied the behavior and pattern of tunnel damage subjected to the different dynamic loading conditions by a similar simulation. Shan et al [20] adopted the self-developed new simulation test device of roadway support, which can apply dynamic and static load, and studied the influence of dynamic and static load on roadway deformation law by comparison.…”

Section: Introductionmentioning

confidence: 99%

Physical Similarity Simulation of Deformation and Failure Characteristics of Coal-Rock Rise under the Influence of Repeated Mining in Close Distance Coal Seams

et al. 2022

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Aiming at the problem that it is difficult to achieve accurate laying of model and precise excavation of roadways in special surrounding rock structure roadway according to conventional physical similarity simulation, which reduces the reliability of experimental results. An accurate laying of model and precise excavation of roadway method, named “labeling positioning and drawing line, presetting roadway model” (LPDLPRM), was proposed. The physical similarity simulation of deformation and failure characteristics of surrounding rock of coal-rock rise, under the influence of repeated mining in close distance coal seams, was carried out based on the method and infrared detection. The results show that the coal-rock rise in close distance coal seams was affected by repeated mining disturbances, and the surrounding rock of coal-rock rise was characterized by obvious asymmetric deformation, specific for the stress and strain near the coal pillar were higher than that of other parts, and cracks near the coal pillar were denser than other parts; when the coal seam is mined in which the coal-rock rise is located, the stress concentration of the surrounding rock near the rise was weakened by mining pressure relief in the upper coal seam; the stress concentration of the surrounding rock near the rise increases when the coal and the lower coal seam are mined, and the stress on the right side (coal pillar side) near the coal-rock rise was the most concentrated. Therefore, it is important to take measures to strengthen support near the coal pillar and to control asymmetric deformation when the coal-rock rise is influenced by repeated mining.

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Experimental and numerical investigation of the dynamic response of tunnel in soft rocks

Cited by 30 publications

References 17 publications

Simulation of blast-induced rock tunnel damage using a 3D numerical model

Simulation of blast-induced rock tunnel damage using a 3D numerical model

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

Physical Similarity Simulation of Deformation and Failure Characteristics of Coal-Rock Rise under the Influence of Repeated Mining in Close Distance Coal Seams

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