Blasting methods for heterogeneous rocks in hillside open-pit mines with high and steep slopes

2017 Global Conference on Polymer and Composite Materials

材料科学;化学

Chen, Y.J.^1 ; Chang, Z.G.^1 ; Chao, X.H.^1 ; Zhao, J.F.^2

Department of Mining, Xinjiang Institute of Engineering, Urumqi

830000, China^1

Xinjiang Hong Shun Mining Investment Co. Ltd., Urumqi

830054, China^2

关键词: Blasting method;    Blasting schemes;    Different heights;    Existing problems;    Heterogeneous rocks;    High and steep slope;    Lime-stone quarry;    Technical guidances;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/213/1/012006/pdf
DOI  :  10.1088/1757-899X/213/1/012006

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In the arid desert areas in Xinjiang, most limestone quarries are hillside open-pit mines (OPMs) where the limestone is hard, heterogeneous, and fractured, and can be easily broken into large blocks by blasting. This study tried to find effective technical methods for blasting heterogeneous rocks in such quarries based on an investigation into existing problems encountered in actual mining at Hongshun Limestone Quarry in Xinjiang. This study provided blasting schemes for hillside OPMs with different heights and slopes. These schemes involve the use of vertical deep holes, oblique shallow holes, and downslope hole-by-hole sublevel or simultaneous detonation techniques. In each bench, the detonations of holes in a detonation unit occur at intervals of 25-50 milliseconds. The research findings can offer technical guidance on how to blast heterogeneous rocks in hillside limestone quarries.