锦屏二级水电站地下厂房岩壁梁开挖爆破试验

在锦屏二级水电站地下厂房岩壁梁爆破开挖施工中,为了获得较好的岩台成型效果,进行了不同方案的爆破试验,并在试验时进行了爆破振动监测。试验结果表明:爆破孔孔距为30cm的爆破效果好于孔距为40cm的爆破效果;孔距为30cm的不耦合系数大于孔距为40cm的不耦合系数,故增加不耦合系数,可以有效提高岩面平整度,减少爆破振动对岩壁面的损伤。

Blasting test of underground workshop' s rock anchor crange beam for Jinping Secondary Hydropower Station

For formation of a better quality rock bench in the blasting excavation of an underground workshop’s rock anchor crane beam for the Jingping Secondary Hydropower Station,optimization of drilling and blasting parameters as well as the charging constitution was carried out through extensive comparative tests with different schemes and blasting vibration monitoring.The results indicate that the blasting effect of 30 cm hole spacing is better than that of 40 cm hole spacing.Furthermore,the coupling coefficient of 30 cm hole spacing is also greater than that of 40 cm hole spacing.Therefore,an increased coupling coefficient could lead to a smoother rock surface and less damage induced by the blasting vibration.