Abstract
Tunneling in densely populated urban areas frequently brings about under-crossing the existing tunnels, which may induce serviceability problems to the existing tunnels. In order to obtain accurate prediction of ground settlement, the current study synthetically analyzes the coupling effects of new tunnels, in-between soil and the existing tunnel, and proposes a new method for predicting the ground settlement caused by construction of a new subway twin tunnel under-passing an existing tunnel. This paper classifies the influence zone caused by construction of the twin tunnels under-passing existing tunnel into strong, weak and no influence zones based on synthetically considering the coupling effects of front-tunnel, in-between soil, rear-tunnel, and the existing tunnel. Further, by extending the proposed method and applying it to the case of twin-tunneling under-crossing an existing tunnel, detail processes for predicting the ground settlement are presented for the cases of strong and weak influence zones. Two case studies were carried out to verify the proposed method, and the results show that the predicting settlements well agree with the measured data.
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Acknowledgements
The authors acknowledge the financial support provided by the National Natural Science Foundation of China (Grant No. 51378071), Natural Science Foundation of Shaanxi Province (Grant Nos. 2014KJXX-53, 2014SZS19-Z01), the Fundamental Research Funds for the Central Universities (Grant Nos. 2014G3213006, 310821163302) and the Traffic Construction Research Funds of Shaanxi Province (Grant No. 2016-1-3).
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Lai, H., Zhao, X., Kang, Z. et al. A new method for predicting ground settlement caused by twin-tunneling under-crossing an existing tunnel. Environ Earth Sci 76, 726 (2017). https://doi.org/10.1007/s12665-017-7079-6
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DOI: https://doi.org/10.1007/s12665-017-7079-6