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| Reinforcement effect and actual measurement analysis of new shield tunnel crossing existing metro tunnel with shed pre-supporting method |
| JIANG Yexiang1, ZHOU Qihui2, YANG Yijun1, SU Fengyang1, LIU Zunjing2, ZHANG Xiao3, DING Zhi3
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1. Hangzhou Metro Group Co., Ltd., Hangzhou 310017, Zhejiang, China;
2. PowerChina Huadong Engineering Co., Ltd., Hangzhou 311122, Zhejiang, China;
3. Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015, Zhejiang, China |
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Abstract The theoretical analysis of the mechanism on the new shield tunnel crossing the existing subway tunnel was carried out, the 15 project instances and the corresponding measured data of new shield tunnels crossing the existing metro was collected and counted. The results showed that the uplift and settlement deformation of the existing subway tunnel were easily caused by new shield short-distance crossing, the maximum vertical displacement was mainly concentrated in the range of ±5 mm, and the deformation of the existing subway tunnel was closely related to the clearance between the two tunnels, reinforcement and soil conditions. Based on the project of Hangzhou Metro Line 2 closely under-crossing Metro Line 1, the deformation of existing subway tunnel during the whole process of shield tunneling was deeply discussed. Meanwhile, the combination of pipe shed and rotary jet reinforcement below existing Metro Line 1 could effectively reduce the deformation of the existing subway tunnel. In the process of crossing construction, the shield construction parameters should be adjusted in real time through the measured deformation data of the existing subway tunnel, so as to ensure the safety of the new shield tunneling.
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Received: 31 March 2021
Published: 20 June 2021
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