Abstract
Water inrush is a serious geological hazard in the deep buried tunnel construction in karst areas. Lining and grouting ring are often built to prevent tunnel from water inrush. The estimation of external water pressure and water inflow is of great significance to the structure design of lining and grouting ring. In this paper, the axisymmetric analytic solutions of external water pressure and water inflow were derived for deep karst tunnels under saturated steady-state flow conditions. A simplified formula for the reduction coefficient of external water pressure was established. This paper analyzed the changing rule of water inflow coefficient and the reduction coefficient of external hydraulic pressure on linings, which varies with the parameters of lining and grouting circle. The rational and available coefficients of grouting circle in karst deep buried tunnel construction are drawn: the grouting ring thickness is 6 m and the hydraulic conductivity ratio of surrounding rock and lining is 100. In addition, the accuracy of the simplified formula was verified by the comparison of analytical solution and numerical analysis. This study provides a reliable calculation method for water inflow and lining water pressure of the deep buried tunnel and have certain reference value for the structural design of deep buried tunnel to reduce water inflow and ensure construction safety.
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Acknowledgements
Much of the work presented in this paper was supported by the National Natural Science Foundation of China (Grant No.s: 51509147) and the promotive research fund for excellent young and middle-aged scientists of Shandong Province (Grant No.: BS2014NJ004).
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Xu, Z., Wang, X., Li, S. et al. Parameter Optimization for the Thickness and Hydraulic Conductivity of Tunnel Lining and Grouting Rings. KSCE J Civ Eng 23, 2772–2783 (2019). https://doi.org/10.1007/s12205-019-1509-9
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DOI: https://doi.org/10.1007/s12205-019-1509-9