Blast hole stemming length effects of rock blasting with parallel double free-surface

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (15) : 80-85.

WANG Yang SHI Xiu-zhi GOU Yong-gang GUO Ting

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Abstract

Rock fragmentation was examined for determining how stemming length affected blast effect. The formula for calculating borehole stemming length range was deduced by momentum theorem. The experiments of rock blasting with parallel double free-surface were simulated with the finite element software ANSYS/LS-DYNA, in which Multi-Material ALE method was used. A four-meter and four-hole infinite rock mass model was established. After analyzing peak stress of the element nearby the free surface and the stress distribution of the rock, we can obtain that the optimal explosive length is 2.4 m in borehole model experiment without stemming; In the borehole model with one-sided stemming or asymmetric double-sided stemming, blasting had no effect on the stress distribution law of rock mass, but the peak stress near the free surface increased and acting time lengthened; The optimal stemming length of model with symmetric double-sided blast hole is 1.0~1.2 m. The blasting effects of numerical simulation result was the best after comparing with other simulation results. The validity of numerical simulation result was thus proved.

Key words

parallel double free-surface / rock mass blasting / stemming length / numerical simulation

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WANG Yang SHI Xiu-zhi GOU Yong-gang GUO Ting. Blast hole stemming length effects of rock blasting with parallel double free-surface[J]. Journal of Vibration and Shock, 2016, 35(15): 80-85

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