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Study of decoupled charge blasting based on high-speed digital image correlation method

机译：基于高速数字图像相关法的解耦装药爆破研究

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摘要

Incorporating high-speed camera technology, an experimental system of high-speed digital image correlation is established and extended to blasting research. Based on the model experiment, the effects of the filling medium and the decoupling coefficient on stress evolution in decoupled charge blasting are studied. Different filling media are found to have a significant effect on the transmission of blasting energy. Compared with coupled charge blasting, decoupled charge blasting with air as the filling medium reduces the blasting stress peak in the specimens; while within a certain decoupling coefficient range, the decoupled charge blasting with plasticine as the filling medium increases the blasting stress peak in specimens. The blasting stress attenuation index in specimens exhibits the trend of an initial increase and then a decrease with increasing decoupling coefficient, where the decoupling coefficient corresponding to the maximum stress attenuation index is determined by the filling medium. In addition, the numerical simulation results show that, in decoupled charge blasting, the filling medium greatly reduces the pressure at the borehole wall. With increasing decoupling coefficient, the pressure at the borehole wall attenuates with a mild degree of attenuation.
机译：结合高速相机技术，建立了高速数字图像相关性实验系统，并将其扩展到爆破研究。在模型实验的基础上，研究了去耦装药爆破中填充介质和去耦系数对应力演化的影响。发现不同的填充介质对爆破能量的传递具有重大影响。与耦合装药爆破相比，以空气为填充剂的去耦装药爆破减少了试样中的爆破应力峰值。当在一定的解耦系数范围内时，随着填充介质的增加，爆破应力峰值会随着橡皮泥的解耦而爆炸。试样中的爆破应力衰减指数呈现出先增大后减小的趋势，并随解耦系数的增加而增大，其中最大应力衰减指数所对应的解耦系数由填充介质决定。此外，数值模拟结果表明，在解耦装药爆破中，填充介质大大降低了井壁处的压力。随着去耦系数的增加，井壁处的压力会以适度的衰减程度衰减。

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