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| Mutual disturbance effects of different construction sequence on overlapping shield tunnels with small net distance in soft soil layer and its control methods |
| ZHOU Jingzeng1, WANG Jianhua1, YAN Zihai2,3, WANG Jianwang4, ZHANG Qiang2*
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1. Hangzhou Quality and Safety Supervision Station of Construction Engineering, Hangzhou 310005, Zhejiang, China;
2. Power China Huadong Engineering Co., Ltd., Hangzhou 311122, Zhejiang, China;
3. Zhejiang Intelligent Rail Transit Engineering Technology Research Center, Hangzhou 311122, Zhejiang, China;
4. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510630, Guangdong, China |
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Abstract The construction of overlapping shield tunnels with small net distance is a typical problem, especially in soft soil layer. In order to solve the construction problem of the overlapping shield tunnel of Wuchang Vehicle Base in Hangzhou Metro Line 5, the mutual disturbance influence of construction sequence on the deformation of the soil and the structure of overlapping tunnels was studied using the methods of numerical analysis and field monitoring. The result showed that the construction sequence of lower tunnel ahead of upper tunnel was better than that of upper tunnel ahead of lower tunnel. The influence of the former on the deformation of the soil and the structure of overlapping tunnels was less than the latter; secondary grouting reinforcement and moving support trolley could effectively reduce the deformation of the soil and tunnels. The construction sequence of lower tunnel ahead of upper tunnel was used to carry out the construction of overlapping tunnels.
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Received: 31 March 2021
Published: 20 June 2021
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