露天矿下伏采空区爆破振动预测研究

Research on Blasting Vibration Prediction of the Goaf under Open-pit Mine

利用LS-DYNA软件建立单孔爆破振动模型。研究分析了爆破振动在采空区的传播衰减规律,并对采空区顶板振速预测模型进行了拟合,分析确定了爆破振动对采空区的主要影响因素。结合量纲齐次分析理论得出采空区顶板爆破振动峰值振速预测公式,运用Matlab软件回归拟合得到采空区顶板爆破振动峰值振速预测公式的相关系数。可根据工程实况计算爆破单段最大安全起爆药量或预测空区顶板峰值振速,为现场爆破施工设计提供理论依据。

The software LS-DYNA was employed to build model for blast vibration with a single hole. The influence of blast vibration to the goaf was analyzed,and the fitted prediction formula of the vibration velocity on the goaf roof was obtained.The main factors affecting the blasting vibration on goaf were determined. Combining with the dimensional theory of homogeneous analysis,the blasting vibration peak velocity prediction formula of goaf roof was obtained,and Matlab software is used to make regression fitting to get correlation coefficient of blasting vibration peak velocity prediction formula of goaf roof. The maximum charge weight of blasting to guarantee safety can be calculated and the vibration peak velocity can be predicted according to actual engineering,which can provide theoretical guide for in situ blast construction design.