关键词: 无底柱分段崩落法, 扇形炮孔, 爆破推墙, 物理模拟分析

Abstract: The pushing-wall accident caused by the medium-deep hole blasting is one of the common accidents in the mines the sublevel caving mining method is adopted.The occurrence of the accidents not only lead to process difficulty,but also increased the large rate,which affect the stope regular production.In order to solve the above problems effectively,according to the fan-patterned hole blasting physical simulation test results,the influence of charge structure to the blasting direction is discussed,and the internal mechanism of the rock mass broken by fan-patterned medium-deep hole blasting is revealed,besides that,the fundamental causes of the formation of pushing-wall accidents are discussed.Based on the above analysis results,the determination method of reasonable charging coefficient and charge structure of fan-patterned hole is proposed.The application results show that the method proposed in this paper is help for avoiding the formation of pushing-wall accidents,and it is also conducive to reducing the large rate remarkably.

Key words: Non-pillar sublevel caving mining method, Fan-patterned hole, Blasting pushing-wall, Physical simulation analysis