露天矿火区内三类爆破钻孔快速灭火降温方法研究

Study on the fire-extinguishing technology for three types of blasting borehole in open-pit mine burning area

针对露天矿火区上覆岩层爆破剥离前,高温爆破钻孔灭火降温的薄弱环节,以强化爆破钻孔特征为切入点,根据钻孔温度和孔底特性将露天矿火区高温爆破钻孔分为火区上部的爆破钻孔、打穿火区的爆破钻孔、火区附近的爆破钻孔等三类,并制定了三类高温爆破钻孔的灭火降温方案。根据灭火降温方案构建了以三相泡沫防灭火技术为主,灌浆、注水为辅的综合灭火降温系统,通过与单一的注水、注浆灭火降温效果对比,综合灭火降温系统具有快速、高效的特点,并成功的对东露天矿15万m2火区内的爆破钻孔灭火降温,保证了东露天矿的安全爆破和按时完成生产进度计划。

It＇s difficult to cool the high temperatureblasting borehole before stripping the overlying strata in the open-pit mine fire zone. According to the location distribution of blasting boreholes relative to the fire zone,the blasting boreholes can be classifiedas three types： blasting boreholes above the fire zone, blasting boreholes through the fire zone and blasting boreholes near the fire zone. Based on the different blasting boreholesdistribution,the appropriate fire-extinguishing method is applied. The comprehensive fire- extinguishing scheme is based on three phase foam, supplemented by water injection and grouting. Compared with water injection and grouting, the comprehensive fire-extinguishing technology control the fire zone efficiently. A firing zone of 150,000m2 in Donglutian was completely controlled and the safety production on schedule was ensured.