Abstract: With the rapid development of the national economy, the transportation infrastructures have entered a period of large-scale construction, and more and more tunnels have entered the frequent hazard occurrence period. The problem of water leakage from construction joints is one of the main hazards in the process of tunnel construction and operation. First, it seriously affects the safety and durability of the tunnel structure. In order to study the leakage pattern from tunnel construction joints, a seepage model test system was developed, which consists of a hydraulic loading device, an air pressure loading device, a seepage test block model and a data acquisition device. Through the analysis of the information such as the amount of water leakage and the time of starting leakage, the anti-leakage performance of the tunnel lining construction joint itself is analyzed, and the influence of different factors on the leakage of the construction joint is studied. Simulating the unfavorable construction conditions that may occur during the on-site construction, quantitatively evaluates the influence of unfavorable construction on the leakage of the tunnel lining construction joint.

Key words: Tunnel Lining, Model Test, Construction Joints, Water Leaking