岩石破碎机理的微差爆破最佳延时控制

发布时间：2018-11-20 17:58

【摘要】：为探究微差爆破最佳的孔间起爆延期时间,从岩石破碎机理出发,将应力波和爆生气体能量综合作用方式作为研究载体,结合波动学理论、热力学理论以及断裂力学理论,推导出应力波和爆生气体作用下的运动和动力学方程、破坏范围、作用时间和传播速度的数学公式.在此基础上,运用推导出的物理参数对哈努卡耶夫提出的延时控制半经验公式进行修正,得出了微差爆破延期时间选取的理论模型.最后,结合某露天矿进行不同段别高精度澳瑞凯雷管组合的微差爆破实验,结果显示此次试验爆破后效果最佳延期时间为25 ms,而将该地质条件的力学参数代入推导得出的最佳延期理论模型,得出延期时间为24 ms左右,说明该理论模型与本次实验结果较为吻合.
[Abstract]:In order to explore the best delay time of inter-hole initiation in millisecond blasting, starting from the mechanism of rock fragmentation, the comprehensive action mode of stress wave and explosion gas energy is taken as the research carrier, combined with wave theory, thermodynamics theory and fracture mechanics theory. The equations of motion and dynamics, the range of failure, the time of action and the velocity of propagation under the action of stress wave and explosive gas are derived. On this basis, the semi-empirical formula of delay control proposed by Hanukayev is modified by using the derived physical parameters, and the theoretical model of delay time selection of millisecond blasting is obtained. Finally, combined with an opencast mine, a millisecond blasting experiment of different sections with high precision Auricai detonator combination is carried out. The results show that the best delay time after blasting is 25 ms,. The mechanical parameters of the geological condition are added to the optimal delay theoretical model, and the delay time is about 24 ms, which shows that the theoretical model is in good agreement with the experimental results.
【作者单位】：福州大学紫金矿业学院;福州大学爆炸技术研究所;福州大学环境与资源学院;华中科技大学土木工程与力学学院;
【基金】：国家自然科学基金(41072232) 福建省自然科学基金(2011J01310)
【分类号】：TB41

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