Landslide is easy to occur at the tunnel portal due to the engineering geological condition
hydrogeological condition and some human activities. Taking into account the landslide formation feature
the geological condition as well as hydrogeological condition of Matou tunnel of Baoji-Tianshui Expressway
the landslide of tunnel portal is analyzed by using nonlinear finite element method. The deformation characteristics and the distribution of plastic zones are obtained
and the sliding surface position is decided. Finally
the reinforcement scheme is proposed. This study can offer a reference for similar engineerings.landslide of tunnel portal; slope stability analysis; finite elements;