An experimental study on slotted cartridge directional controlled blasting
YANG Renshu1,2,ZUO Jinjing1,YANG Guoliang1
1. School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;
2. State Key Laboratory for Geomechanics and Deep Underground Engineering ,Beijing 100083, China
The high speed schlieren experiment system and rock mass damage testing technology were used to discuss the propagation mechanism of slotted cartridge explosion wave and explosive gas, and the damage range of the rock mass was measured under doses of the slitting package.The experimental results show that the explosion shock wave and explosion gas of the slitting package are tracked and photographed.The separation study of the two effects was realized.And both maintain a high symmetrical state from the extended form.The blast wave propagates preferentially along the slit direction, and the formed "diversion" effect was preferentially applied to the blasthole wall.The generated initial damage area and the shock wave in other directions are caused by the expansion of the shock wave around the slit direction.The explosive gas first expands from the crack, and extends in a "one" shape mainly along the slit direction.The quasi-static pressure acts on the rock mass to promote the continuous development of cumulative damage zone, forms a “jet” effect along the slit direction, and promotes the continuous expansion of cracks.The increase of the dose has a great influence on the damage degree of the rock in the direction of the slit because the damage value of the rock mass in the direction of the slit is greater than in the direction of the vertical slit.
杨仁树1,2,左进京1,杨国梁1. 切缝药包定向控制爆破的实验研究[J]. 振动与冲击, 2018, 37(24): 24-29.
YANG Renshu1,2,ZUO Jinjing1,YANG Guoliang1. An experimental study on slotted cartridge directional controlled blasting. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(24): 24-29.
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