露天采场边坡对爆源不高于坡脚处的爆破震动存在放大作用。通过对露天采场高程放大效应机理分析,认为萨道夫斯基公式难以准确描述采场内爆破震动衰减规律;通过引入高程因素对萨道夫斯基公式进行修正,运用最小二乘法原理进行多元线性回归分析,建立震动衰减模型。对司家营铁矿Ⅱ采场中深孔爆破进行现场监测,验证了高程放大效应的存在。回归计算结果表明,修正的萨道夫斯基公式更具科学性。
The open pit slope can amplify blasting vibration whose explosion source is not higher than the toe of slope.Based on the analysis of the mechanism of elevation amplification effect in open pit,the paper considers that Sa-dove formula has difficulty in accurately describing blasting vibration attenuation law in stope.So a modified Sadove formula with the introduction of the elevation factors and a multiple linear regression analysis performed by the princi-ple of least square method combine to establish the attenuation model.The existence of elevation amplification effect is verified by monitoring medium-long hole blasting in No.Ⅱ stope of Sijiaying Iron Mine.The regression calculation re-sults prove the modified Sadove formula to be more scientific.
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