| Numerical Investigation of Ground Settlement Induced by Twin Tunnel Excavation |
| کد مقاله : 1691-IWWA |
| نویسندگان |
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Ramin Vafaei Poursorkhabi *1، Amin Salahi2، Alireza Naseri2، Alireza Alizadeh Majd2، Mohammad Kolahi Notash2، Elyar Nazari2 1Department of Civil Engineering, Ta. C., Islamic Azad University, Tabriz, Iran 2Mojtame Daneshgahe azad tabriz |
| چکیده مقاله |
| Urban expansion has increased the demand for twin-tunnel metro systems, yet the interaction between closely spaced tunnels can produce overlapping settlement troughs that threaten surface structures. This study presents a three-dimensional numerical investigation of ground-surface settlement induced by twin-tunnel excavation for Tabriz Metro Line 2 using PLAXIS 3D. A seven-layer soil profile was modelled with the Hardening Soil constitutive model under realistic traffic loading. Fourteen analyses examined the influence of tunnel spacing (2D, 3D, 4D), burial depth (1.5D, 1.8D, 2D), and excavation sequence (simultaneous versus sequential, including phase intervals of 2D, 4D and 6D). Results show that reducing center-to-center spacing from 4D to 2D markedly increases maximum surface settlement and widens the settlement trough, while sequential excavation with larger phase intervals reduces peak settlement relative to simultaneous excavation. Greater cover depth attenuates surface movements. The findings provide project-specific guidance for selecting tunnel layout and construction sequencing to minimize surface settlement in layered urban ground and can be extended to similar metro projects. |
| کلیدواژه ها |
| Twin tunnels, Ground surface settlement, Numerical modeling, Excavation sequence |
| وضعیت: پذیرفته شده برای ارسال فایل های ارائه پوستر |
