山岭隧道衬砌外水压力公式解析研究

隧道衬砌外水压力问题,一直是人们关注的焦点。本文以甘肃木寨岭隧道为工程实例,考虑地下水渗流流速对于衬砌外水压力的影响,运用线性渗流定律及地下水动力学理论,推导出隧道衬砌外水压力及隧道毛洞涌水量的理论计算公式,并与其他经典、经验公式进行了对比验证分析。通过对推导公式的解析,得出了影响隧道衬砌外水压力大小的各因素主次关系,依次是：衬砌渗透系数>注浆圈渗透系数 >注浆圈厚度>渗流流速,其研究成果可对隧道设计施工和安全管理提供理论指导。

Research on the Formula of External Water Pressure of Mountain Tunnel Lining

The external water pressure of tunnel lining has always been the focus of attention. The paper takes the Muzhailing Tunnel in Gansu Province as the project example, applying the SlinearSpercolationSlaw and the groundwaterSdynamics theory, and considering the influence of the seepage flow velocity on the external water pressure of tunnel lining, infered formula of external water pressure of tunnel lining and the cave waterSinflow, and compared with other classic and empirical formulas. Through the analysis of the calculation formula, it is concluded that the main and secondary relations of the factors affecting external water pressure of tunnel lining are as follows: The lining permeabilityScoefficient > the groutingSring penetration coefficient > the groutingSring thickness > the seepage flow velocity,its research results may provide the theory instruction to design and construction of the tunnel and safety management.