小湾水电站高边坡爆破震动安全判据试验研究

Experimentation on Judging Standard of Blasting Vibration Safety in High Slope Excavation of Xiaowan Hydropower Station

分析了小湾水电站高边坡的地质结构特征，结合施工进行了爆破试验、爆破振动监测、爆破前后岩体声波波速对比测试和边坡岩体宏观调查。通过对爆破试验的各项测试结果进行分析，对比类似工程的经验，提出了小湾水电站高边坡开挖的爆破安全判据为：微风化岩体的震速为15-20cm／s，弱风化岩体10～15cm／s，强风化岩体10cm／s，以上一个马道坡脚位置作为控制点，并确定了使用原则。其试验成果在施工爆破中得到了验证。

The geological structure character was analyzed about high slope on Xiaowan Hydropower Station. Blasting test in construction field, vibration monitoring, contrast tests of wave velocity before and after blasting, and macro-survey for the Xiaowan Hydropower Station were performed. Compared with similar engineering experiences, the blasting safety controlled standard of wave velocity inside rock for Xiaowan Hydropower Station is as follows： for minutely weathered rock, v = 15 - 20 cm/s; for weakly weathered rock, v = 10 - 15 cm/s; for strong weathered rock, v = 10 cm/s. The test results were verified in construction site and considered to be rational .