The water-proof and drainage system within the tunnel has adopted the comprehensive treatment project of the combined linings and setting the PVC pellicle in the middle, the connection of the longitudinal, loop pipes and the rubber-sealing belt.

• 洞内防排水采用复合式衬砌中间设聚氯乙烯薄膜结合纵向、环向盲管及橡胶止水带的综合治理方案。