Design of sequential excavation method for large span urban tunnels in soft ground – Niayesh tunnel |
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| Affiliation: | 1. Department of Mining and Metallurgy Engineering, Amirkabir University of Technology, Tehran, Iran;2. Department of Mining Engineering, Sahand University of Technology, Tabriz, Iran;3. P.O.R Consulting Co., Tehran, Iran;4. Department of Civil and Environmental Engineering, University of Tarbiat Modarres, Tehran, Iran;1. School of Highway, Chang’an University, Xi’an 710064, China;2. School of Civil Engineering, Chang’an University, Xi’an 710064, China;3. CCCC First Highway Consultants CO., Ltd., Xi’an 710075, China;1. School of Highway, Chang’an University, Xi’an 710064, China;2. China Guangzhou Metro Design & Research Institute Co., Ltd, Changsha 410000, China;3. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China;1. Key Laboratory for Urban Underground Engineering of the Education Ministry, Beijing Jiaotong University, Beijing 100044, China;2. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore |
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| Abstract: | Modern tunnel design and construction requires appropriate techniques and technologies during all phases of a tunnel project. Selecting a suitable excavation procedure for large span urban tunnel projects in soft ground is a key factor for successful construction of the project. The costs and time for tunnel construction are strongly influenced by the choice of the excavation procedure. This research focuses on the selection of excavation method, excavation sequence and optimum trailing distance between different excavation stages in soft ground urban tunnelling. Considering soft ground condition and the big cross section of the Niayesh urban road tunnel project, sequential excavation method (SEM) was selected for tunnel construction. In this phase, Central Diaphragm (CD) and Side wall Drift (SD) methods were proposed for tunnel construction and appropriate method was selected based on its potential to limit surface settlements. Then, different excavation sequences considering side wall drift method were planned and modelled using three dimensional finite element method and optimal excavation sequence was selected. Finally, the trailing distance between different excavation stages were analysed numerically and the optimal distance with minimum surface settlement was determined. |
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