Analysis on the Earthquake Damages Characteristics of Tunnel Through Fault Zone

The factors and types of earthquake damages to tunnel through fault zone are analyzed and concluded based on the research on earthquake damage data of tunnel through fault zone in previous great earthquakes. The results indicate that tunnels through fault zone with complex geological conditions, high geo-stress and poor surrounding rock quality are main earthquake damage parts and controlling areas. The main factors which affect tunnel earthquake damage consist of seismic intensity, seismic fortification code, and construction quality of tunnel and activity of fault zone, all of which jointly affect the extent of earthquake damage to tunnel. Ductility lining structure which shall be adopted to fault zone and extended section of tunnel to avoid tunnel entire collapse; The types of earthquake damage to tunnel through fault zone at fractured zone mainly consist of dislocation of tunnel lining, longitudinal/transverse cracking of lining, chipping or peeling of lining, bulging of floor, and entire collapse of lining and surrounding rocks. The research results mentioned plays an important role in the understanding of earthquake characteristics of tunnel through fault zone, and will provide precious basic data to the practical seismic design and construction of tunnel crossing fault.