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| Countermeasures and analysis of large diameter shield tunneling under operating subway tunnel with small clear distance in downtown complex environment |
| TU Zhiyi, GUO Hongyu, SUN Fei, ZHONG Fangjie, ZHENG Haolong, ZHANG Zhe
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| Zhejiang Institute of Communications Co., Ltd., Hangzhou 310030, Zhejiang, China |
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Abstract The large diameter(13.46 m)shield was used to undercross the existing metro tunnel on the North Ring Road-Tianmu Mountain Expressway. This paper started with the long-term monitoring results of the existing metro tunnel, and combined the distribution characteristics of the upper and soft and hard complex strata and the spatial position relationship between the large shield and the subway tunnel, the feasibility of short distance underpass was analyzed, the MJS(Metro Jet System)columns was used to reinforce the surrounding strata of the existing subway tunnel and grouting reinforcement in the tunnel from the ground was proposed. The effectiveness of the overall response measures was verified by the finite difference software FLAC3D, and the field implementation and the actual monitoring results were analyzed. The practice showed that the scheme of large diameter shield tunneling under the existing subway tunnel with small clear distance in the upper soft and lower hard stratum was feasible, and the measures of MJS ground reinforcement of the surrounding stratum of the existing tunnel and grouting reinforcement in the tunnel were effective, which could provide reference for similar engineering construction.
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Received: 25 May 2021
Published: 20 December 2021
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