Abstract:According to the construction of Heshang three-lane tunnels with small clear space in Fuzhou international airport highway,the monitoring of blasting vibration was carried out. Based on measured data,the propagation and distribution characteristics of vibration waves in the rock mass were analyzed. Some conclusions have been drawn. Vibration speed at tunnel wall is greater than that at the foot of the wall;and the better the rock mass quality is,the less differences the vibration speeds at the two places are. The maximum vibration speed occurs at the radial direction of tunnel wall facing the blasting side,which can be regarded as the controlling vibration speed. When the clear distance of two tunnels is 6 m(about 0.35B),the disturbance range of blasting vibration to inter-space rock is 10–20 m apart from the blasting working face. The better the quality of rock mass is,the less the disturbance range is. And the blasting has more influences on the rock in front of the blasting face than that behind of the blasting face. In addition,the total explosive volume should be strictly controlled and decreased,as well as the single segment,and the blasting segments interval time should be greater than 100 ms. The experience and conclusions presented can be referred in the blasting controlling and site monitoring of similar tunnels.