顶板深孔预裂爆破技术在综放工作面中的应用

Application of deep hole pre-split blasting in fully mechanized caving face

阳城煤矿3305工作面埋深大且受断层影响,顶底板及煤层具有弱冲击倾向性且临近3303采空区,有发生冲击地压的可能。本文从减弱冲击动载及改善区域静载2个方面,阐述通过顶板深孔预裂爆破技术降低3305工作面冲击危险性的机理,并通过分析矿震数据验证了实践应用效果。研究结果表明,实施顶板深孔预裂爆破后,区域矿震频次及能量明显减小,说明顶板深孔预裂爆破可有效减弱矿震能量强度、降低区域应力集中程度。研究结论可为深孔预裂爆破技术在综采放顶煤工作面两顺槽及断层区域冲击地压防治提供借鉴和参考。

No.3305 Face of Yangcheng Mine was deeply buried and affected by faults. There were weak impact tendency of roof, floor and coal seam, and this face was close to No. 3303 Goaf, so there was a possibility of rock burst. The mechanism of reducing the impact risk of No.3305 Face by roof deep hole pre-split blasting technology was expounded from two aspects of weakening impact dynamic load and improving regional static load, and the practical application effect was verified by analyzing mine earthquake data. The results showed that after the implementation of roof deep hole pre-split blasting, the frequency and energy of regional mine earthquakes were significantly reduced, indicating that roof deep hole pre-splitting blasting could effectively reduce the energy intensity of mine earthquakes and reduce the degree of regional stress concentration. The research conclusions provided reference for the deep hole pre-splitting blasting technology in the prevention and control of rock burst in the two roadway and fault areas of fully mechanized top coal caving face.