深埋式中心水沟排水隧道渗流场解析研究

以镜像法和渗流力学理论为基础，推导半无限平面内深埋式中心水沟排水隧道渗流场及涌水量的解析解.依托深埋式中心水沟排水隧道工程实例，应用FLAC3D有限差分软件建立数值模型，从隧道涌水量、衬砌水压力两方面验证所得解析解的正确性，探究隧道水下埋深、围岩渗透性对衬砌水压力的影响规律.研究结果表明，深埋式中心水沟涌水量大、有效排导能力强，是隧道排水体系的主要排水路径，也是控制隧底水压力的关键；即使在隧道水下埋深较大或围岩渗透性较好的情况下，深埋式中心水沟排水方式仍可以有效降低衬砌水压力，控制隧底水压力，减少因隧底水压力过大导致的病害的发生.

Analytical study of seepage field of deep-buried central ditch drainage tunnel

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.