Analysis and cause of occurrence of lining cracks on NATM tunnel based on the precise inspection for safety and diagnosis - Part I

摘要: A crack is the main cause to affect integrity of tunnel lining as well leakage, spalling, exposed rebar, corrosion, carbonation and so on. Since 1980, NATM has prevailed on excavation method geotechnical philosophy in tunnel. Although pattern cracks been reported by several engineers' effort, it was only focused longitudinal lining. Eleven operational tunnels have conducted with precise inspection for safety diagnosis KISTEC (Korea Infrastructure Safety Technology Incorporation). With those results, patterns spatial distribution appearance each analyzed occurrence seven common types classified. Additionally, above duct slab figured out numerical simulation field inspection. Each CCD (Charge-Coupled Device) scanner image 3D configuration. type also explained output experimental condition construction. Defined will be good example periodical diagnosis.