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《Journal of Engineering Geology》 2009-06
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STABILITY EVALUATION OF SURFACE ROCK BLOCKS IN HIGH SLOPE UNDER BLASTING

HUO Yuxiang HUANG Runqiu JU Nengpan ZHAO Jianjun(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059)  
Rock slope has weak structural planes. They are propitious to stability. The primary stability problem of rock slope i the surface rock block stability. Blasting vibration with excavation is an important factor in stability evaluation of surface rock blocks. This paper examines the case of a granite slope on middle Dadu River. It summarizes the rule of the failure rock blocks on surface characteristics. Secondly,it measures the blasting vibration acceleration curve of a potential failure block. Finally,it completes the slope stability evaluation. As a result,the volume of failure blocks is always less than 10 m3. 80% failure blocks are formed by weak structural planes,and 70% of these are along the slope benches. Comparing with rock mass near the block,the block vibration time is longer but with lower climax and lower frequency. Equivalent-statical method is more appropriate in practice.
【CateGory Index】: TU457
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