The analytical solution of seepage field and water inflow of tunnel with deep-buried ditch drainage hole in semi-infinite plane was deduced with the method of images and percolation mechanics theory.A numerical model was established by using FLAC3D software based on the engineering example of deep-buried central ditch drainage tunnel.The correctness of the analytical solution was verified from the aspects of tunnel water inflow and lining water pressure.And the influence of the underwater depth of the tunnel and the permeability of the surrounding rock on the water pressure of the lining was further explored.Results showed that deep-buried central ditch was the main drainage path of tunnel drainage system with large discharge and strong effective drainage capacity,and it was also the key to controlling the tunnel bottom water pressure;even if the tunnel was buried deep under water or the surrounding rock permeability was good,the deep-buried central ditch drainage method can effectively reduce the lining water pressure,and control the tunnel bottom water pressure,which can reduce the occurrence of diseases caused by excessive water pressure at the tunnel bottom.
Journal of Zhejiang University（Engineering Science)
method of images
analytical study of seepage field
analysis of water inflow in tunnel