Abstract
The safety of the high rock slope under blasting loading is of great concern during the engineering construction. A better understanding of vibration distribution and reasonable monitoring scheme are essential to control the dynamic response induced by blasting excavation of high rock slope. Based on the excavation of WuDongde high rock slope in southwest of China, vibration amplification characteristic around the slope surface was investigated carefully with different kinds of experiment. The Peak Particle Velocity (PPV) of blasting vibration at the slope surface and flat ground was compared. Results demonstrate that the PPV at the slope surface is large than that of flat ground and the amplification effect is obvious. The partial amplification law of slope surface is revealed as the amplification factor of vibration at the outside of the berm is much larger than that of inside. The amplification effect in the vertical direction is stronger than the radial and tangential direction. Then numerical simulation was employed to investigate the vibration amplification characteristic with more working conditions. Results agree well with the experiment and reveal that the local amplification characteristic could be obviously found around the berm. The blasting energy, geometry of the bench and rock mass quality could affect the amplification effect significantly. The suggestion of blasting vibration monitoring scheme for high rock slope was proposed according to different objectives based the understanding of vibration amplification. If the aim is to evaluate the dynamic stability or get the blasting vibration attenuation law of high rock slope, monitoring points should be arranged at the inside of the berm, but while the most unfavorable response of rock mass is expected to be obtained, the out edge of the berm should be selected as the monitoring position. The study expects to provide a good reference for the blasting vibration control and measurement of high rock slope.
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