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以长河坝水电站泄洪放空系统及中期导流洞工程爆破施工为对象,运用理论分析和现场监测等方法,确定了地下洞室测点布置位置,现场实测到了6组三个方向爆破振动速度和主频,分析得到放空洞爆破振动衰减相关系数K、α值,进而提出了对隧洞群上方岩体进行“纵向分层,横向分块”的划分原则,确定了控制爆破的方法与参数。结果表明,研究出的爆破控制技术能够保证下方特大洞室的安全。
Taking the flood discharge and drainage system of Changheba hydropower station and the blasting construction of medium-sized diversion tunnel project as targets, the location of measuring points in underground caverns was determined by theoretical analysis and on-site monitoring. The blasting vibration velocities of 6 groups in three directions Frequency, the correlation coefficients K, α of blasting vibration attenuation are obtained, and then the principle of “longitudinal stratification and horizontal block” of rock mass above the tunnel group is put forward, and the methods and parameters of controlling blasting are determined. The results show that the developed blast control technology can ensure the safety of the extra large caverns.