【作者】 高毓山； 胡志强；

【Author】 GAO Yu-shan HU Zhi-qiang (Nanfen Iron Mine,BX STEEL,Benxi 117014,Liaoning)

【机构】 本钢南芬露天铁矿；

【摘要】 南芬露天铁矿进行的主要是大孔径直孔预裂爆破,取得了一定的成效。本文介绍了2006年6月至7月间使用先进仪器,根据南芬露天铁矿的实际情况,对现场的生产爆破及预裂爆破的爆破震动进行了现场测试,并进行了减震效果分析,将萨道夫斯基公式中的 K 和α值回归计算,从而对采场上盘中部370水平的预裂爆破震动速度进行了预测。预测结果与实测值比较分析表明,南芬露天铁矿预裂爆破在 X、Y、Z 三个方向降震率的平均值为47.2%。更多还原

【Abstract】 presplitting blast,ever since its being put into use in 2003,has reduced the adverse effects to slope stability caused by blasting seism in the course of production blast at the stope,in the mean time,made the slope surface more level,ensured the safety of the operating personnel and equipments working underneath,assured the smooth mining production in the mine and thus is of great signicance to the sustainable development for the open pit mine.In Nanfen Iron Mine,mainly Vertical,big diameter borehole presplitting blasts are carried out,even though achived some progress,how about the seism reducing effects?The paper expounds that according to the real situation of Nanfen blasting seism caused by the production blast and presplitting blast at the site were measured by using advanced equipment from June 2006 to July,the seism reduction effects analysed.The K value and α value were returned for calculation in the sardovski formula and thus a forecast on seismic velocity of the presplitting blast at the 370 level in the middle part of upper bench of the stope was made.Analysis on the comparison between the forecast result and the actual value shows that the average value of seism reduction in the x,y,z three directions in the presplitting blast at Nanfen Iron Mine is 47.2%.更多还原