宜万铁路岩溶隧道地质条件复杂、岩溶形态多样，高压富水溶腔段是岩溶隧道治理的重点和难点。在对充填型溶腔进行富水分级的基础上，制定岩溶隧道的防排水原则。对于可以排放的溶腔，研究总结了使岩溶水的排放得到合理控制的总体方案和安全保障方案。对于采用“以堵为主”原则进行处理的高压富水充填岩溶，研究总结了相应的全断面帷幕注浆技术、隧道周边超前预注浆技术，并提出了外堵内固周边注浆新技术，在保证安全的前提下极大地加快了施工进度。宜万铁路岩溶隧道的结构防排水按照“因地制宜、堵排结合、多道防线”的原则进行。

The establishment of tunnel waterproof and drainage principle is the base of determining water treating method, technology and lining design. The Yichang-Wanzhou railway tunnel is with complex geological conditions and various karst cavities, treating of the solution cavities with high water pressure is the emphasis and difficulty. Based on the water rich classification of filling cavities, the waterproof and drainage principle is put up. A universe schedule and a series of protective schedules are put forward in order to control water drainage. For filling cavities that must be dealt with blockage principle, full face curtain grouting and periphery grouting are studied, and a new grouting method "blocking water out of tunnel profile and consolidation in the profile"  is put forward,which helps to accelerate the construction. The structure waterproof and drainage principle is blockage and drainage associating based on actual condition, more waterproof measures are advocated in the principle. The successful experience is helpful for other karst tunnel construction.