坚硬顶板切缝药包深孔预裂松动爆破技术研究

以安徽淮南张集矿为背景，采用数值模拟和现场试验相结合的方法进行坚硬顶板松动爆破关键控制技术的研究。数值模拟了切缝药包深孔松动爆破效果，进行了普通药包爆破与切缝药包控制爆破现场对比试验。结果表明:所提出的基于切缝药包定向断裂的巨厚坚硬顶板超深孔松动预裂技术，可以扩大爆破裂纹定向扩展范围，解决超深孔松动预裂炮孔爆破底部眼间距过大的难题，从而实现对爆破破裂面及坚硬顶板的垮落位置的精准控制，以及人为调控周期来压步距，使坚硬顶板能够及时、安全垮落，实现工作面的连续安全开采。

Research on deep hole pre-splitting loosening blasting technology of hard roof cutting seam charge pack

This research studies the key control technology in the process of hard roof loosening blasting, with Zhangji Mine of Huainan, Anhui as the background of the field test, combined with numerical simulation.Numerical simulation of the deep hole loosening blasting of the slitting charge was carried out.The field comparison test of the ordinary charge control blasting and the slitting charge was conducted.The results show that the proposed combined technology of loosening pre-splitting of ultra-deep holes in the huge and hard roof and directional fracture of the slitting charge can increase the directional expansion range of blasting cracks and solve the problem of excessively large bottom hole spacing in ultra-deep hole loosening pre-splitting blasthole blasting and so as to achieve precise control of the blasting fracture surface and the collapse position of the hard roof; artificially regulate the interval of periodic weighting, so that the hard roof can collapse in time and safely, and the working face can mine continuously and safely.