Blasting vibration characteristics of shallow tunnel under-passing hillside buildings in short-distance were investigated. Based on the engineering background of New Hongyan tunnel of Chengdu-Chongqing High-speed Railway

the vibration characteristics of tunnel blasting were measured. Then by analyzing the results of ground vibration on shallow buried side (the lower part of slope) and deep buried side (the upper part of slope)

the characteristics of vibration velocity

principal vibration frequency and safety assessment method were discussed. In the blasting near zone of shallow tunnel

the incident p-wave is the primary wave. Moreover

the major components of the horizontal and vertical ground vibrations can be considered as the projection of the incident p-wave in both horizontal and vertical directions. Besides

the ground vertical and horizontal velocities in shallow and deep buried sides have relationship with the distance from explosive source to measurement points and the angle between the incident p-wave and the vertical direction. Compared with applying non-electronic detonators for the tunnel blasting

using digital detonators one by one can effectively reduce the ground vibration strength and improve the ground vibration principal frequency. In addition

the ground vertical principal vibration frequencies are generally higher than the horizontal principal vibration frequencies. Furthermore

the ground vertical and horizontal principal vibration frequencies of the shallow side are higher than the corresponding directions principal frequencies of the deep buried side. With respect to shallow tunnel under-passing hillside buildings in short-distance

the blasting vibration characteristics should be measured in the deep and shallow buried sides simultaneously. The safety of structures nearby can be assured by judging the vibration velocity and the relationship between the principal vibration frequencies of the deep and shallow buried sides of tunnel and buildings simultaneously.