Abstract: With the development of tunnel construction of the expressway in mountains areas, the vibration of the ground surface caused by the blasting construction in the tunnel has been increasingly an engineering concern that to be addressed urgently. Focused on the safety issues of the impact of the blasting in the tunnel on the vibration at the ground surface, along with the subsurface conditions at the Tiaohuapo Tunnel of the Fifth Contract Section of the HuaxiAnshun Expressway, the numerical model is established by using the commercial finite element analysis software MIDAS/GTS NX. The ground vibration velocities are obtained at various conditions. The results indicate that, with the increase of the blasting action time, the resultant total particle vibration velocity, horizontal as well as vertical variation velocities demonstrate an increase before the degradation. The multi point Gaussian function can be used to fit the relationship between the peak vibration velocity and the distance to the center of the blasting.

Key words: Vibrations induced by the Blasting in the Tunnel, Particle Vibration Velocity in the Ground Surface, Total Vibration Velocity, MIDAS/GTS NX, Multi Peak Gaussian Function, Elevation Difference, Distance to the Blasting