大南湖二号露天煤矿烧变岩石爆破试验

Rock blasting experiment in Dananhu No.2 Open-pit Coal Mine

针对大南湖二号露天煤矿部分煤层自燃,导致煤层上覆岩系及围岩烧变、烘烤,使变形特性原本塑性的岩石变成性脆易碎的烧变岩石,岩体呈碎裂结构,造成钻孔易坍塌、成孔率低,爆破难度大、效果差等问题;对该矿台阶高度、孔网参数、孔径及钻机设备等方面进行调整试验研究,通过采用合理的台阶高度、孔网参数、孔径及钻机设备,有效防止了炮孔坍塌,确保了钻孔成孔率,保证了钻孔和爆破效果,满足挖运标准,同时挖运后达到标准化矿山要求。

According to spontaneous combustion of some coal seams in Dananhu No.2 Open-pit Coal Mine,the overlying rock system and surrounding rock of coal seam are burned and baked,which makes the original plastic rock of deformation characteristics become brittle and fragile burning rock.The rock mass is fractured,which results in the problems of easy collapse of borehole,low rate of hole formation,difficulty of blasting and poor effect.According to this situation,we carry out the adjustment test of step height,hole network parameters,hole diameter and drilling rig equipment.By adopting reasonable step height,hole network parameters,hole diameter and drilling rig equipment,the hole collapse is effectively prevented,the hole formation rate is ensured,the drilling and blasting effect is guaranteed,and the excavation and transportation standard is met after meeting the requirements of standardized mines.