Effect of Soil Type on the Deformational Behavior of Two Tunnels | ||
| Journal of Al-Azhar University Engineering Sector | ||
| Articles in Press, Corrected Proof, Available Online from 22 October 2025 PDF (593.61 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/auej.2025.363727.1789 | ||
| Authors | ||
| Tasneem Essa* 1; wael Nashat2; Mohamed Tarek3 | ||
| 1Giza higher institute for Engineering and Technology | ||
| 2Civil Engineering, Benisuif University | ||
| 3Civil Eng. Dept. Faculty of Engineering, Al-Azhar University | ||
| Abstract | ||
| In this paper the effect of type of soil and diameter of tunnel on the deformational behavior of two adjacent tunnels were studied. A parametric study on adjacent twin tunnels was carried out based on numerical analysis using PLAXIS 3D finite element analysis. The parametric study included the tunnel diameter and type of soil. The effect soil consistency for cohesionless and cohesive soils was investigated, with tunnel diameter (D) in the range of 6.00 to 15.00 m. The spacing between twin tunnel, and soil cover above the tunnel were taken as 1.5D. The investigated parameters are settlement of ground surface, tunnel vertical deformation in soil, deformation of tunnel and all-round soil stress were discussed and analysis. It was found that, the effect of diameter on ground settlement is more significant than the tunnel spacing from D = 6 to 8 m, then with increase of tunnel diameter the increase in rate of ground settlement becomes negligible. On the other hand, after spacing (2-3)D the increase in rate of ground settlement becomes negligible. The tunnel vertical and lateral deformation increase in semi linear pattern with the increase of tunnel diameter for different soil consistencies. The elastic modulus has significant effect on the results of soft clay. Increasing the elastic modulus for soft clay from 5 to 25 MPa, decreased the tunnel crown deformation in soil by 11.46%. and also, surface settlement of soil by 54.93%. | ||
| Keywords | ||
| tunnel diameter; soft clay; spacing between twin tunnel; deformation | ||
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