Stability and reliability of a shallow tunnel in soft surrounding rock: construction technology and prediction

Jia, Jianqing; Tenorio, Victor; Zhang, Bangxin; Li, Mingzheng; Xin, Chengping

doi:10.1007/s12517-022-09428-1

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…Tunnels are underground infrastructures or geostructures intended for diverse community applications such as transportation, conveyance of cables (electricity, telephone), sewers, recreation, etc., as well as military applications such as strategic defense, storage, etc. Tunnels are considered shallow when the tunnel crown is close to the ground surface [1]. Ballistic threats are those that intend to damage the target by penetration (e.g., missile), striking at a high velocity.…”

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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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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“…The deformation and stability of the surrounding rock are closely related to the excavation and support methods. A reasonable excavation and support method is of great significance to the stability of the surrounding rock and engineering safety (Guo et al, 2018;Song et al, 2019;Tian et al, 2019;Zhao et al, 2019;Jia et al, 2022). In particular, tunnels in weak strata should be supported timely and reasonably after excavation, otherwise they are vulnerable to surrounding rock rupture and structural damage.…”

Section: Introductionmentioning

confidence: 99%

Research on the deformation control of surrounding rock about large-section tunnel in strong-medium weathered slate

Niu

Wang²,

Fan³

2023

Front. Earth Sci.

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Affected by dip angle and thickness of strata and the tunneling method, soft rock tunnel has obvious characteristics of large deformation, long deformation time and difficult support. Based on a case study of Gelong the deformation and failure mechanism of surrounding rock, stress characteristics of supporting structural and control method of large section highway tunnel passing through strong-medium weathered carbonaceous slate stratum are studied. This paper proposed construction method based on strengthening the longitudinal stiffness of supporting structure and increasing the integrity of surrounding rock, The results showed that the deformation of surrounding rock and the stress of supporting structure increased rapidly in the early stage of construction. The cumulative deformation of vault settlement and horizontal convergence reached 116.9 mm and 97.9 mm, respectively, accounting for 73.53% and 76.62% of the total deformation. The proportion of surrounding rock pressure shared by the primary support and the secondary lining was about 8.9:1.1. This shows that the initial support after comprehensive reinforcement has a strong supporting capacity, and effectively reduces the secondary lining pressure of the tunnel, which plays a vital role in the long-term service of the secondary lining.

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Stability and reliability of a shallow tunnel in soft surrounding rock: construction technology and prediction

Cited by 2 publications

References 25 publications

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

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

Research on the deformation control of surrounding rock about large-section tunnel in strong-medium weathered slate

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