Study on the optimization of blasting parameters and blastholes charging structure for broken orebody
Kunpeng Yu, Peng Lin, G. P. Chitombo, Liqiang Ma, Chengkun Peng
Abstract
Optimizing blasting parameters is a crucial and challenging aspect for mines to enhance production efficiency and ensure safe operations. Effectively controlling the distribution density of explosive loading in blastholes is equally vital for achieving optimal blasting results and safeguarding the brow line. This study focuses on the ore recovery blasting in fractured rock structures using the sublevel caving method. Through orthogonal experiments and range analysis, the factors of burden, hole bottom distance, and charge coefficient are prioritized, leading to the determination of the optimal combination of blasting parameters. Addressing the challenges posed by ore recovery blasting, such as damage to surrounding rock masses , excessive blasting, wall pushing, hang-up, blockage of large fragments, brow line damage, and the excessive compression of fragmented ore, this study employs the LS-DYNA program to establish a numerical model based on explosive loading structure optimization for sublevel caving. The model analyzes the extent of damage to the rock mass in the working face caused by blasting loads, as well as the proportion of fragmented rock, providing a quantitative assessment of the impact of blasthole loading structures on blasting effectiveness.