Effects of twin tunnels construction beneath existing shield-driven twin tunnels |
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| Affiliation: | 1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;2. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore;1. Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China;2. College of Civil Engineering, Hunan University, Changsha 410082, China;3. Ningbo Rail Transit Project Construction Headquarter, Ningbo 315012, China;1. University of Napoli Federico II, Italy;2. Skanska, UK;3. University of Napoli Parthenope, Italy;1. School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China;2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;3. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China;4. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | This paper presents a case of closely spaced twin tunnels excavated beneath other closely spaced existing twin tunnels in Beijing, China. The existing twin tunnels were previously built by the shield method while the new twin tunnels were excavated by the shallow tunnelling method. The settlements of the existing tunnels and the ground surfaces associated with the new tunnels construction were systematically monitored. A superposition method is adopted to describe the settlement profiles of both the existing tunnels and the ground surfaces under the influence of the new twin tunnels construction below. A satisfactory match between the proposed fitting curves and the measured settlement data of both the existing tunnels and the ground surfaces is obtained. As shown in a particular monitoring cross-section, the settlement profile shapes for the existing tunnel and the ground surface are different. The settlement profile of the existing structure displays a “W” shape while the ground surface settlement profile displays a “U” shape. It is also found that due to the flexibility of the segmental lining, the ground losses obtained from the existing tunnel level and the ground surface level in the same monitoring cross-section are nearly the same. |
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| Keywords: | Tunnelling Settlement Ground loss Soil/structure interaction |
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