【摘要】 周宁水电站地下厂房尺寸为66.82m×17.90m×42.20m(长×宽×高)的大硐室,其围岩为新鲜完整的钾长花岗岩。在爆破开挖中,为保护岩锚梁壁,在对保护层采用预裂爆破的条件下对其进行了爆破振动安全监测,分析了在该施工条件下爆破对花岗岩体的爆破振动效应,用回归方法计算求出其地震波衰减系数α和因素系数k,总结出新鲜完整花岗岩体中爆破地震波的传播规律,从而推断爆破对围岩的损伤度,并以此指导后期工程中爆破参数的选择和安全控制方案。所得完整花岗岩体的爆破地震波传播参数,可为同类工程提供参考依据。更多还原

【Abstract】 The underground workshop of Zhouning Hydropower Station is a large chamber with size of 66.82 m× 17.90 m×42.20 m(L×H×W );its wall rock is lengthened crisp and whole granite. In order to protect rock anchor and girder wall,safety monitoring of exploding tremor is considered for the wall rock after adopting presplit blasting to protected layer in the courses of blasting and digging. This paper analyzes the domino effect of blasting tremor that blasting brought,acquires attenuation coefficient α of earthquake wave and equation coefficient k by using the regression analysis method;summarizes the transmitting rule of blasting earthquake wave indwell the crisp and whole granite,consequently. The scathing extent is deduced,which is used to supervise the upper preferences and the scheme of safety command. The transmitting parameter of earthquake wave can provide reference to similar engineering.更多还原