高程对某露天矿边坡爆破振动传播规律的影响

发布时间：2018-07-17 15:06

【摘要】：以马钢集团某露天铁矿为例,从爆破振动影响下边坡稳定性控制及周边建(构)筑物等的安全出发,采用爆破振动现场测试方法,开展了高程因素影响下爆破振动传播规律试验研究;采用量纲分析提出了萨道夫斯基修正公式。研究结果表明:随着高程差的增加,爆破振动速度在台阶部位岩体上存在"鞭梢效应",即表现出高程放大效应;爆破振动速度放大系数随测点至爆源水平距离的增加呈现出衰减规律,且放大系数在水平距离300 m范围内较为明显;爆破振动速度随高程差的增加以衰减为主,高程放大效应随高程差的增加而逐渐增大,且高程放大系数在高程差200 m范围内增长迅速,500 m后趋于稳定;高程差的存在增大了爆破振动危害。采用修正的萨道夫斯基公式提高了矿山边坡爆破振动速度预测的精确性,对于采场边坡及周边设施的安全控制具有指导意义。
[Abstract]:Taking an opencast iron mine in Masteel Group as an example, based on the stability control of slope and the safety of surrounding building (construction) under the influence of blasting vibration, the field test method of blasting vibration is adopted. The experimental study on the propagation law of blasting vibration under the influence of elevation factors was carried out, and the modified formula of Sadolski was proposed by dimensional analysis. The results show that with the increase of height difference, there is a "whipping effect" of blasting vibration velocity on the step rock mass, that is, the effect of height amplification. The magnification coefficient of blasting vibration presents the attenuation law with the increase of the distance between the measuring point and the detonation source, and the magnification coefficient is obvious in the range of 300 m horizontal distance, and the velocity of blasting vibration mainly attenuates with the increase of height difference. The effect of elevation amplification increases gradually with the increase of elevation difference, and the elevation magnification coefficient increases rapidly in the range of 200 m of elevation difference and tends to be stable, and the existence of elevation difference increases the damage of blasting vibration. The accurate prediction of blasting vibration velocity of mine slope is improved by using the modified Saadolski formula, which is of guiding significance for the safety control of stope slope and its surrounding facilities.
【作者单位】：中钢集团马鞍山矿山研究院有限公司;马鞍山矿山研究院爆破工程有限责任公司;
【分类号】：TD235.1;TD854.6

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