Experimental Study on Vibration Characteristics of Rock Mass Blasting at Layered Slope

Taking the excavation blasting of chasm at layered rock slope as the background,five blasting experiments considering two different blasting ways including deep-hole blasting and small-bench blasting have been done.Through measuring the particle vibration velocities in different directions,the propagating characteristics of seismic waves in layered rock mass and their affecting factors are analyzed.The research results show that the vibration intensity resulting from deep-hole blasting is over 5 times than that of small-bench blasting;at the same blasting,the vibration velocity along the strike of slope is about 1.1～1.4 times as that of its vertical direction in deep-hole blasting,and the corresponding value for small-bench blasting is 1.2～1.9;in the construction of chasm at layered rock slope,the multi-step excavation scheme of deep-hole blasting with the projection layer can be used,and the maximum charge amount per delay interval could be restricted by the millisecond delay initiation so as to reduce the vibration intensity.