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| Analysis of protective effect of isolation piles in shield tunnel construction at different burial depths adjacent to high-speed rail pile foundations |
| XING Huitang1,2, WANG Jian1,2, HUANG Yongliang1,2,3, LIU Kunlong1,2, LI Chenghu4
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1. Jinan Rail Transit Group Co., Ltd., Jinan 250014, Shangdong, China;
2. Shandong Key Laboratory of Intelligent Rail Transit Informatization and Equipment, Jinan 250014, Shangdong, China;
3. Shandong Rail Transit Research Institute Co., Ltd., Jinan 250014, Shangdong, China;
4. China Railway 12th Bureau Group Co., Ltd., Jinan 250101, Shangdong, China |
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Abstract Four shield tunnels with different burial depths of Jinan Railway R1 and R2 are under the bridge of Beijing-Shanghai High-speed Railway at the same construction section, and in order to reduce the influence of shield construction on the pile foundation of High-speed Railway, the isolation piles were formed by the bored piles and cyclone piles between the interval structure and bridge piles. Based on this, the isolation and protective effect of the isolation piles on the different burial depths of the shield tunnel construction was studied by numerical analysis. The calculation results showed that the application of isolation piles between the new shield tunnel and adjacent high-speed rail bridge pile foundation could effectively reduce the range of influence of tunnel construction and reduce the impact of tunnel construction on adjacent pile foundation; the greater the tunnel burial depth within the range of pile lengths of adjacent piles, the greater the impact of tunnel construction on them, and the more significant the protection effect of isolation piles on them.
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Received: 02 January 2021
Published: 20 March 2021
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