Study on the Defects Characteristics of Water Leaking of Old Tunnels in Cold Regions

According to the characteristics of old in-use tunnels managed by Shenyang Railway Bureau, a investigation on defects like water leaking has been carried out by video recording, unfolded drawing and Ground Penetrating Radar (GPR) scanning. The features of defects such as tunnel lining cracking, surface corrosion, freeze-thaw, water infiltration, etc. are studied carefully. Based on the above, this paper summarizes the detecting methods for water leaking, voids, debonding, delaminations and moisture, and then analyses the defects features, which lays a theoretical foundation for tunnel defects testing and treatment. The conclusion also provides guidance for engineering practice and integrated maintenance of tunnels.