复杂环境下水电站厂房开挖控制爆破试验研究

为控制厂区爆破开挖强度、保障邻近建筑物及居民的安全,通过爆破振动的现场测试,获得了三级电站厂区岩石爆破振动速度传播与衰减规律的经验公式,据此计算了不同控制部位的一次起爆最大单段药量。在EL340 m平台进行了预裂爆破、主爆区中深孔松动爆破试验,并进行了爆破振动监测。试验结果表明,采用单孔单响的孔间顺序微差松动控制爆破,能够满足厂区中深孔爆破施工对爆破振动和爆破飞石的控制要求,为调整厂区开挖方法提供了科学依据。

Experimental Research on Controlled Blasting Excavation in Hydropower Plant on Complex Surrounding

In order to solve the intensity of blasting excavation and protect the safety of aajacent buildings andresidents,the field tests of blasting vibration were taken to obtain the empirical formula of blasting vibration propagatlon in the third cascade power station plant,then calculated the maximum charge amount per delay at different distance.At EL 340 m platform,we taken tests of pre-split blasting and deep hole blasting and monitoring.The resdts show that using loosing blasting with millisecond delay,firing hole by hole,can meet the requirements of blasting vibration and flyroeks in deep hole blasting,which provides a scientific basis for adjusting the excavation method.