露天转地下开采爆破振动的现场监测与分析

Monitoring and Analysis of Blast Vibration for Transforming Opencast Mining into Underground Mining

对大冶铁矿东露天转地下开采无底柱分段崩落法回采挂帮矿爆破振动速度的测试与研究表明,质点爆破振动速度与单响最大爆破药量、爆心距、炸药种类和堵塞情况有关。在露天转地下开采时,如果对采空区充填废石,不仅可以使边坡表面岩体处于有利的三向受力状态,回填废石体还起到了爆破减震作用,同时还有明显的高频滤波作用,有利于保持地下巷道的稳定性。

A vibration velocity measurement and research of a side blasting with non-floor pillar sublevel caving stoping for transforming openeast mining into underground mining in Daye iron mine is made. It shows that the particle vibration velocity is related to the maximum single sound charge, distance from the blasting point to the measured point, types of explosive and blocking condition. While transforming opencast mining into underground mining, if a goave is filled up with gangues, the surface rock mass of slope can not only be made to find oneself in an advantageous three dimensional force-bearing state; but the backfilled gangue mass re duces the blasting vibration; moreover it also pays an obvious role in filtering the high frequency wave, wbich is in favour of the stability of the underground opening.