露天微差爆破延期时间选取

Selection of delayed time in millisecond blasting of open-pit mining

阐述了露天微差爆破合理延期时间选取的影响因素,在分析国内外关于最佳延期时间选取的研究基础上,总结主要存在的几大理论假说以及相关的理论计算和半经验数学模型,探析不同假说侧重的不同影响因素以及各影响因素作用机理,并对几种假说试用条件和优缺点进行分析。为今后改善我国露天微差爆破效果和提高经济效益提供理论指导,同时根据具体工程实例和试验指出微差延期爆破较普通逐排爆破的优越性。

This paper mainly expounds the influential factors to the selection of delayed time in millisecond blas- ting of open-pit mining. Based on the former study in the optimal delayed time, this paper summarizes several theo- retical hypothesis and semi empirical mathematical models. Also, emphasis points and mechanism in different influ- ential factors have been discussed. After systematic comparison, different applicable conditions, as well as advantages and disadvantages in different hypothesis are pointed out. Consequently, this paper offers theoretical guidance to the improvement of millisecond blasting in open-pit mining and economic revenue. In the meantime, on the basis of experimental data, millisecond blasting shows a better effect than traditional blasting.