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Tunnel-Soil-Structure Interaction Under Seismic Load
The soil-structure interaction is significant in analyzing and designing structures, especially the high-rise buildings under dynamic loads. In many cities, there are tunnels under the buildings. Therefore, this study took into account the interaction between the tunnel, structure, and the soil. This interaction is valued on the behavior of a high-rise building consisting of 15 floors that are exposed to an earthquake underneath by a tunnel of 10 m diameter (D). Several parameters have been considered using numerical analysis using PLAXIS 2D software, comprising the horizontal distance (X) between the tunnel and the center of the building as ratios (X/D = 0, 1, 2, 3, and 4), as well as the effect of the vertical distance (H) between the foundation base and the crown of the tunnel as ratios (H/D = 1, 2, 3 and 4). Results showed a significant influence on the interaction between the tunnel, soil, and structure. The horizontal displacement of the building increased under the seismic load when the axis of the building coincided with the tunnel (X/D = 0), and the maximum displacement was obtained at a distance (X/D = 1). The horizontal displacement decreased with the increase in the horizontal distance. Besides, the Inter-story drift increased more than 1.5% at a distance (X/D = 0), meaning that the building began to collapse, and the effect of the tunnel decreased as it became away from the building. The differential settlement increased with the presence of the tunnel, reaching the highest increase by 240% at (X/D = 1). On the other hand, the influence of tunnel depth showed through an increase in the horizontal displacement and the inter-story drift when the tunnel is shallow (H/D = 1 and 2). The differential settlement increased by 200% at (H/D = 1) and decreased with increasing the depth of the tunnel. The effect of the tunnel disappeared at a depth greater than 4D.
Tunnel-Soil-Structure Interaction Under Seismic Load
The soil-structure interaction is significant in analyzing and designing structures, especially the high-rise buildings under dynamic loads. In many cities, there are tunnels under the buildings. Therefore, this study took into account the interaction between the tunnel, structure, and the soil. This interaction is valued on the behavior of a high-rise building consisting of 15 floors that are exposed to an earthquake underneath by a tunnel of 10 m diameter (D). Several parameters have been considered using numerical analysis using PLAXIS 2D software, comprising the horizontal distance (X) between the tunnel and the center of the building as ratios (X/D = 0, 1, 2, 3, and 4), as well as the effect of the vertical distance (H) between the foundation base and the crown of the tunnel as ratios (H/D = 1, 2, 3 and 4). Results showed a significant influence on the interaction between the tunnel, soil, and structure. The horizontal displacement of the building increased under the seismic load when the axis of the building coincided with the tunnel (X/D = 0), and the maximum displacement was obtained at a distance (X/D = 1). The horizontal displacement decreased with the increase in the horizontal distance. Besides, the Inter-story drift increased more than 1.5% at a distance (X/D = 0), meaning that the building began to collapse, and the effect of the tunnel decreased as it became away from the building. The differential settlement increased with the presence of the tunnel, reaching the highest increase by 240% at (X/D = 1). On the other hand, the influence of tunnel depth showed through an increase in the horizontal displacement and the inter-story drift when the tunnel is shallow (H/D = 1 and 2). The differential settlement increased by 200% at (H/D = 1) and decreased with increasing the depth of the tunnel. The effect of the tunnel disappeared at a depth greater than 4D.
Tunnel-Soil-Structure Interaction Under Seismic Load
Karkush, Mahdi O. (editor) / Choudhury, Deepankar (editor) / Al-Farhan, Zaid F. (author) / Al-Obaydi, Moataz A. (author) / Al-Saffar, Qutayba N. (author)
Geotechnical Engineering and Sustainable Construction ; Chapter: 8 ; 91-102
2022-03-20
12 pages
Article/Chapter (Book)
Electronic Resource
English
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