立井大直径中空孔直眼掏槽爆炸应力场数值模拟分析与应用

doi:10.13722/j.cnki.jrme.2014.0296

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Abstract For improve drilling and blasting excavation efficiency of vertical shaft hard rock section，design a large diameter cavity in center of same deep of two section parallel cut blasting. According to theoretical calculation and practical experience choose cut blasting parameters，circle diameter of the first section cut hole is 1 700 mm and it?s hole space is 850 mm，the second section cut hole circle diameter is 2 500 mm with hole space 650 mm. Finite element software LS-DYNA is used for blasting stress field of first section cut blasting numerical simulation analysis and blasting parameters rationality verification. The numerical simulation results show that large diameter cavity in center can improve stress peak value and extend action time，stress wave of rock around large diameter cavity is 2.2 times than the value of rock without cavity. At the same time，numerical simulation show stress wave superposition and reflection，guiding phenomena during large diameter cavity of parallel cut. Then deep-hole blasting field research for vertical shaft hard rock section is done，obtained good effect of average utilization rate 91.7%，lumpiness uniform in rock stability coefficient f = 12–17.

Key words： blasting mechanics vertical shaft hard rock large diameter cavity parallel cut blasting stress field numerical simulation

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0296 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/Is1/3223

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