预裂爆破震动效应试验研究

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Abstract In order to study the vibration effect of presplit blasting，blasting vibration and sound wave tests are conducted in the foundation pit of Shidao Bay Nuclear Power Station in Shandong Province，China. Based on the change rate of sound wave velocity before and after blasting，damage depth of bedrock is determined. The attenuation law of site blasting vibration is obtained through in-situ test. The test results indicate that，under the same lithology the bedrock damage depth increases linearly with maximum charge weight per delay interval，and increases exponentially with the increase in peak particle vibration velocity. The degree of rock mass damage increases with the reduction in distance from explosion source. Presplit blasting mainly affects the upper part of rock mass. Furthermore，based on field test，the relationship between damage depth of bedrock caused by blasting and peak particle vibration velocity of rock mass 30 m away from explosion source is established；and peak particle vibration velocity is adopted as the reference parameter to be the safety control standard of presplit blasting excavation. It is shown that the controlling method effectively ensures safety of rock mass under presplit blasting excavation in foundation pit slope.

Key words： mechanics of explosion presplit blasting vibration effect sound wave rock mass damage experimental study

Received: 26 April 2010

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