Abstract: This paper presents a case history of the analysis and design of a highway tunnel through an active fault zone. The tunnel was modelled through the combinations of geological investigations and numerical analysis. The engineering geology, hydrological as well as geotechnical aspects of the proposed tunnel were studied from the high rock mass stress and high activity of the fault point of view. The impact of displacement magnitude of the fault zone on the composite tunnel lining structures, as well as the deformation of the tunnel are numerically simulated. The criteria for the tunnel deformation failure are classified.

Key words: Highway Tunnels, Active Fault Zones, Shear Zone