Experimental study on effect of topography on propagation of blasting waves

The law of propagation of vibration wave of blasting is mostly affected by property of rock material and parameters of explosive loadings, whereas the topography affects greatly propagation of vibration wave under condition of a variety of terrains. Many explosion tests are carried out in the second period engineering project in Ling'ao Nuclear Power Station, Guangdong Province. The dissemination of vibration wave of blasting is analyzed in concave or protruding topography. The results show that the concave landforms have great effects on decreasing scale of vibration wave of blasting. It is found that the attenuation coefficient of vibration wave in concave landform is relative to its width and depth and to charge weight per delay interval and explosive distance. The protruding topography can enhance scale of vibration wave of blasting The amplification effect is related to orientation in protruding topography, and that the vertical vibration velocity is amplified more than that of the horizontal vibration. The amplified coefficient of vibration wave blasting is augmented with relative altitude, but decreases with the scale distance of explosive in protruding topography. In addition, the scale effect of protruding landform is also related to property of rock mass, and the structure of rock and the growth of cranny.