Application and Practice of Pre-splitting Blasting Technology for High-and-steep Slopes in Open-pit Mines
In recent years,slope collapse accidents caused by slope instability in open pit mines have occurred from time to time.Therefore,it's of great importance to improve the quality of slope construction and ensure slope stability,especially for open-pit mines designed with high and steep slopes.In the construction process of the slopes of open-pit mines,due to the complexity of rock face fissures,faults,dip angles,and strikes,it is necessary to design the optimal pre-splitting hole blasting parameters based on the actual exposed rock and soil conditions to ensure the construction quality of the slopes.The open-pit mining and stripping project in the Niukutou lead-zinc mining area of Qinghai Hongxin Mining Co.,Ltd is located at a high altitude on a plateau,with complex hydrogeological and geotechnical structures and it's designed with high and steep slopes.After repeated optimization and practice of the design parameters such as pre-splitting hole spacing,hole diameter,charging method,detonation method,etc.,the relevant design parameters to guarantee the quality of slope cutting are finally obtained.Currently,the percentage borehole vestiges is high and the shape of cut slope is beautiful and neat.
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