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| Optimal Analysis of Construction Schemes for Urban Shallow-Buried Multi-arch Tunnel by Single-Tunnel Method |
| DUAN Wei-Dang-1, YUAN Cheng-Hai-2, ZHENG Wen-Bo-3, SHI Zhan-4, CAI Yong-Chang-3 |
| (1. Jiangxi Province Highway Investment Group Taihe Management Center, Taihe 343700, Jiangxi, China; 2. Jiangxi Transport Consultation Company, Nanchang 330008, China; 3. Department of Geotechnical Engineering, Tongji University, Shanghai 20092, China; 4. China Railway Siyuan Survey and Design Group Co. Ltd., Wuhan 430063, China) |
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Abstract Building a large-span multi-arch tunnel by single-tunnel method under complex urban shallow-buried conditions is a challenging engineering problem. Without the middle wall supporting, it is very important to choose a suitable construction method and scheme, which is used to control the deformation of the surrounding rock, and reduce the adverse effect of construction process. By finite element method, the excavation effects of two construction methods, the bench method and the center cross diaphragm (CRD) method, were compared based on the displacements of surrounding rock and lining. The result shows that the CRD method has advantages in coupling the surrounding rock. For the CRD method, it is better to excavate the outer than the inner regions.
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Received: 05 June 2011
Published: 30 January 2012
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