露天矿台阶爆破对邻近巷道的振动监测及分析

    Monitoring and analysis of vibration of adjacent roadway by bench blasting

    • 摘要: 为了准确分析台阶爆破振动作用下邻近巷道安全性问题,以某铁矿-68 m台阶爆破为工程背景,在邻近爆区的巷道布置9个测点并进行爆破振动速度现场监测,研究爆破振动峰值速度在传播过程中的衰减规律并将实测振速值与理论振速值进行比较;利用希尔伯特黄变换方法对巷道监测的信号进行分解与变换处理,根据爆破振动信号能量的分布特征进一步对巷道安全性做出评价。结果显示:巷道内测点振动峰值速度集中于1~10 cm/s且主频率变化范围在10~50 Hz之间, 符合爆破振动安全标准,同时结合爆破振动监测数据及回归分析确定了爆破振动衰减系数Kα,并验证实测振速值与理论振速值的相对误差分布在1.3%~3.8%之间,为巷道安全性预测提供参考。爆破振动瞬时能量谱出现5个峰值且在0.2 s 时刻达到最大,在0~0.2 s时间段内不进行多段雷管起爆以达到减少瞬时能量集中分布的目的。

       

      Abstract: In order to accurately analyze the safety problem of the adjacent roadway under the effect of bench blasting vibration, 9 measuring points were arranged at adjacent roadway in the depth of -110.2 m, conducting field monitoring of blasting vibration velocity based on -68 m bench blasting of the Dagushan mine, and discussing attenuation law of propagation process of blasting vibration wave.The energy distribution characteristics of blasting vibration signals were explored by using HHT method to decompose and transform the signals.The results show that the blasting vibration velocity is distributed at 1-10 cm/s and the main frequency is concentrated on 10-50 Hz.Combined with the monitoring data of blasting vibration and the back analysis, the attenuation coefficient of blasting vibration is certained, and the relative error between the measured velocity value and the theoretical value is within the 1.3%-3.8% acceptable range, which is the predicted of the peak velocity of blasting vibration.The instantaneous energy of blasting vibration appears 5 peaks and reaches the maximum value at 0.2 s.To reduce the damage effect of blasting vibration to adjacent laneway, avoiding detonation of multiple detonators at 0-0.2 s is imperitive in reducing the distribution of instantaneous energy.

       

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