STABILITY EVALUATION OF SURFACE ROCK BLOCKS|IN HIGH|SLOPE UNDER BLASTING

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 m3. 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. 