深孔台阶爆破近场振动峰值速度分布特征分析

On the Near-field Peak Particle Velocity Distribution Characteristics of Deep-hole Bench Blasting in Hydropower Projects

爆破振动峰值速度及分布是水利水电爆破工程质量的关键控制指标。为分析爆破因素对爆破振动峰值速度及分布影响,提出了考虑反射拉伸波作用的改进线性叠加模型预测爆破振动方法,分析起爆位置、孔间延时、同响炸药量等因素对近场爆破振动峰值速度分布及大小的影响。计算表明在同等装药条件下,起爆位置对爆破振动峰值速度分布影响小,但孔间短延时明显增大其速度峰值并改变峰值速度分布。

The peak particle velocity and distribution of blasting vibration are the key quality control parameters of water conservancy and hydropower projects.To analyze the influences of various blasting factors on the peak velocity and distribution of blasting vibration,an improved linear superposition model is proposed,in which the effect of the reflected tensile wave is considered.The influences of the initiation position,time-delay between holes and simultaneous explosive charge on the distribution and magnitude of the near-field peak particle velocity are investigated.The results show that under the same charge condition,the initiation position has little influence on the peak particle velocity distribution of blasting vibration.While the short time-delay between holes obviously increases the magnitude of the peak particle velocity and changes the distribution.