A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Numerical Analysis of the Dynamic Behavior of Shallow Tunnel: a Case Study of Djebel El-Ouahch Tunnel, Algeria
https://orcid.org/http://orcid.org/0000-0003-4751-1556
The study of the seismic behavior of tunnels has become a major concern for geotechnicians in recent years, especially after the collapse of the many underground structures around the world, constructed in soft ground at shallow depths. Several studies focused on the distortion of the tunnel cross section caused by shear waves which propagate vertically to the tunnel axis. However, the study of the tunnel seismic response to the compression waves which propagate parallel to the axis of the tunnel is almost neglected. These compression waves can cause a serious axial and bending deformation in the tunnel lining. Therefore, this paper aims to present a numerical analysis of part of the T1 tunnel of the Algerian East-West Highway, in the province of Constantine, that suffered a very significant damage caused by a sudden collapse. The goal is to demonstrate the influence of seismic waves of compression as well as the effect of embedment depth on the behavior of the lining of the tunnel and its surrounding soils. The study was performed using a 3D finite difference calculation method (FDM) using the FLAC3D calculation code. The nonlinear soil is considered by using Hardin-Drnevich model of the hysteretic damping and an elastoplastic model of Mohr-Coulomb. The results were presented in terms of horizontal stresses, shear stresses, horizontal displacements, and shear strains developed at the level of the two elements of the tunnel (lining, soil). The results show that the most affected parts of the tunnel are the concrete of the side wall, the tunnel raft, and their surrounding soil. These results suggest the appearance of cracks at those locations. In other hand, the results show that when decreasing the tunnel depth, the horizontal tensile stresses increase, which causes the reduction of the shear strength of the soil mass and the lining. Consequently, they cause the failure of the soil-tunnel system, increasing the risk of damage instability of the tunnel. In addition, increasing the depth reduces greatly the horizontal tensile stresses and contributes to the stability of the soil-tunnel system. Finally, the novelty of the work is the study of the impact of seismic compression waves by the application of the FDM to evaluate the behavior of a real case of damaged tunnel.
Numerical Analysis of the Dynamic Behavior of Shallow Tunnel: a Case Study of Djebel El-Ouahch Tunnel, Algeria
https://orcid.org/http://orcid.org/0000-0003-4751-1556
The study of the seismic behavior of tunnels has become a major concern for geotechnicians in recent years, especially after the collapse of the many underground structures around the world, constructed in soft ground at shallow depths. Several studies focused on the distortion of the tunnel cross section caused by shear waves which propagate vertically to the tunnel axis. However, the study of the tunnel seismic response to the compression waves which propagate parallel to the axis of the tunnel is almost neglected. These compression waves can cause a serious axial and bending deformation in the tunnel lining. Therefore, this paper aims to present a numerical analysis of part of the T1 tunnel of the Algerian East-West Highway, in the province of Constantine, that suffered a very significant damage caused by a sudden collapse. The goal is to demonstrate the influence of seismic waves of compression as well as the effect of embedment depth on the behavior of the lining of the tunnel and its surrounding soils. The study was performed using a 3D finite difference calculation method (FDM) using the FLAC3D calculation code. The nonlinear soil is considered by using Hardin-Drnevich model of the hysteretic damping and an elastoplastic model of Mohr-Coulomb. The results were presented in terms of horizontal stresses, shear stresses, horizontal displacements, and shear strains developed at the level of the two elements of the tunnel (lining, soil). The results show that the most affected parts of the tunnel are the concrete of the side wall, the tunnel raft, and their surrounding soil. These results suggest the appearance of cracks at those locations. In other hand, the results show that when decreasing the tunnel depth, the horizontal tensile stresses increase, which causes the reduction of the shear strength of the soil mass and the lining. Consequently, they cause the failure of the soil-tunnel system, increasing the risk of damage instability of the tunnel. In addition, increasing the depth reduces greatly the horizontal tensile stresses and contributes to the stability of the soil-tunnel system. Finally, the novelty of the work is the study of the impact of seismic compression waves by the application of the FDM to evaluate the behavior of a real case of damaged tunnel.
Numerical Analysis of the Dynamic Behavior of Shallow Tunnel: a Case Study of Djebel El-Ouahch Tunnel, Algeria
https://orcid.org/http://orcid.org/0000-0003-4751-1556
The study of the seismic behavior of tunnels has become a major concern for geotechnicians in recent years, especially after the collapse of the many underground structures around the world, constructed in soft ground at shallow depths. Several studies focused on the distortion of the tunnel cross section caused by shear waves which propagate vertically to the tunnel axis. However, the study of the tunnel seismic response to the compression waves which propagate parallel to the axis of the tunnel is almost neglected. These compression waves can cause a serious axial and bending deformation in the tunnel lining. Therefore, this paper aims to present a numerical analysis of part of the T1 tunnel of the Algerian East-West Highway, in the province of Constantine, that suffered a very significant damage caused by a sudden collapse. The goal is to demonstrate the influence of seismic waves of compression as well as the effect of embedment depth on the behavior of the lining of the tunnel and its surrounding soils. The study was performed using a 3D finite difference calculation method (FDM) using the FLAC3D calculation code. The nonlinear soil is considered by using Hardin-Drnevich model of the hysteretic damping and an elastoplastic model of Mohr-Coulomb. The results were presented in terms of horizontal stresses, shear stresses, horizontal displacements, and shear strains developed at the level of the two elements of the tunnel (lining, soil). The results show that the most affected parts of the tunnel are the concrete of the side wall, the tunnel raft, and their surrounding soil. These results suggest the appearance of cracks at those locations. In other hand, the results show that when decreasing the tunnel depth, the horizontal tensile stresses increase, which causes the reduction of the shear strength of the soil mass and the lining. Consequently, they cause the failure of the soil-tunnel system, increasing the risk of damage instability of the tunnel. In addition, increasing the depth reduces greatly the horizontal tensile stresses and contributes to the stability of the soil-tunnel system. Finally, the novelty of the work is the study of the impact of seismic compression waves by the application of the FDM to evaluate the behavior of a real case of damaged tunnel.
Numerical Analysis of the Dynamic Behavior of Shallow Tunnel: a Case Study of Djebel El-Ouahch Tunnel, Algeria
Transp. Infrastruct. Geotech.
Berkane, Aicha (author) / Mezhoud, Samy (author) / Karech, Toufik (author) / Beroual, Ahmed (author)
Transportation Infrastructure Geotechnology ; 9 ; 385-401
2022-06-01
17 pages
Article (Journal)
Electronic Resource
English
Parametric Study of Shallow Tunnel Under Seismic Conditions for Constantine Motorway Tunnel, Algeria
| Online Contents | 2022
Intercalation of halloysite from Djebel Debagh (Algeria) and adsorption of copper ions
| Online Contents | 2009