Influence of Stemming Length on Damage Effect of Rock Blasting
The numerical simulation was used to establish a single-hole blasting model,which was then used to simulate the blasting effect with different stemming length.Otsu thresholding technique was adopted for image segmentation,and the data,such as percentage of cracked rock area,fractal dimension of pore structure,and fragmentation of rock mass,were extracted for comparative analysis,so as to explore the influence of stemming length on damage effect under deep-hole blasting.The results show that fractal dimension and percentage of cracked rock area are in an uptrend before falling down as stemming length increases.The fractal dimension reaches the maximum value with stemming length of 3.0 m,and the percentage of cracked rock area reaches the maximum value with stemming length of 1.7 m.Stemming length of 2.2 m can bring the highest number of fragments,and stemming length of 2.0 m can result in the smallest average area of fragments.It is found that the blasting with the stemming length of 2.0-2.2 m can lead to better rock fragmentation effect.As the stemming length increases,the flyrock becomes bigger,and the displacement distance decreases.The research results can be taken as reference in selection of stemming parameters for blasting operation.
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