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针对如何确定水岩分算时隧道衬砌外水压力折减系数问题,结合已有隧道规范中地下水处理的规定及外水压力折减系数经验取值方法,从地下水渗流作用出发,基于地下水水力理论,推导了地下隧道渗水量和复合衬砌结构外水压力折减系数理论求解公式,揭示了灌浆圈、初期支护、二次衬砌渗透系数及灌浆圈厚度等参数的变化对隧道渗水量和衬砌外水压力折减系数的影响规律。在此基础上提出了不同衬砌类型外水压力折减系数取值所应注意的问题及相应的取值方法。研究结果可为隧道工程的防排水系统设计提供借鉴和参考。
Aiming at the problem of how to determine the reduction coefficient of external water pressure of tunnel lining when calculating water and rock, combining with the provisions of groundwater treatment in existing tunnel code and empirical value reduction coefficient of external water pressure, based on seepage of groundwater and based on groundwater hydraulic theory , The theoretical formulas for calculating the seepage of underground tunnel and the external water pressure reduction coefficient of the composite lining structure are deduced. The effects of the variation of the grouting circle, the initial support, the permeability of the secondary lining and the thickness of the grouting ring on the seepage of the tunnel and the lining Influence law of water pressure reduction coefficient. On this basis, the problems that should be paid attention to and the corresponding methods for calculating the reduction coefficient of external water pressure in different lining types are put forward. The research results can provide reference and reference for the drainage system design of tunnel engineering.