切缝药包定向断裂爆破机理与应用研究
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摘要
采用理论分析、数值计算、模型试验和现场试验相结合的方法,对切缝药包定向断裂爆破机理及其在预裂爆破中的应用进行研究。首先对影响爆破效果的三个主要因素,即径向不耦合系数α,切缝宽度W和切缝管材质f进行了数值与试验研究。结果表明,当孔径为42mm,α取1.62,切缝宽度为6mm,切缝管采用硬质PVC材料时,定向断裂效果较好,模型试验与数值结果有较好的一致性。其次对切缝药包轴向分段装药爆破进行了模拟与试验研究,研究结果表明,轴向不耦合系数β取值在33.3%-50%时,定向断裂效果显著。最后进行了90mm和250mm的大孔径双炮孔切缝药包爆破模拟研究,并进行了90mm孔径边坡现场预裂爆破试验,爆破后定向断裂面平整光滑,半眼痕明显,边坡成型质量得到了显著提高。
The mechanism of directional fracture blasting with slotted cartridge and its application in slope presplitting blasting had been studied by theoretical analysis, numerical calculation, model test and field test. First, the three main factors of the impact on blasting effect were carried out numerical and experimental study, namely, non-radial coupling coefficient a, kerf width W and the slotted pipe material f.The result showed that adopting the pore diameter of 42mm, non-radial coupling coefficient of 1.62, kerf width of 6mm and rigid PVC pipe material, the binding energy effect was significant and model test and numerical results were agreed. Secondly, slotted cartridge with axial segment charge had been simulated and experimented. The research indicated that when non-axial coupling coefficientβvalue was at 33.3%-50%, the directional fracture blasting effect was remarkable. Finally, the simulation study of slotted cartridge double blasthole was carried out with pore diameter of 90mm and 250mm. And 90mm diameter blastholes were used in presplitting blasting slope field tests. The research conclusion can be shown that directional fracture surface was smooth, the rates of half-hole marks were higher and apparent slope forming quality had been significantly enhanced.
引文
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