Abstract：
In light of the fact that highway mountain tunnel portal of loose rock, broken and weathered, tunnel excavation is extremely easy to cause adverse geological disasters upward slope landslide and tunnel collapse. To undertake the practical engineering as background, this paper analyses the effect of surface anchor bolt grouting reinforcement against the tunnel portal upward slope. Numerical simulation results show that, in does not affect the tunnel excavation on the vertical displacement and plastic zone volume of surrounding rock, but can reduce the upward slope of the vertical displacement and vertical displacement, enhance the stability of tunnel slope toe and for related engineering provided for reference.
