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从理论上分析了切缝护壁爆破新技术的爆破过程和力学行为。完成了该技术的动态光弹性试验,获得了切缝护壁爆破过程的等差条纹图。通过对条纹图的分析表明,切缝护壁爆破时,爆炸产物首先对切缝处炮孔壁产生作用,然后对临空面方向产生作用,最后才对护壁面方向产生作用,且这种作用越来越小。由于护壁材料的存在,能够大大降低爆炸产物对护壁面方向的冲击作用,临空面和护壁面之间的剪应力差值高达1.75倍,它是形成光滑爆破开裂面和破碎临空面方向介质的重要动力,理论分析和试验结果表明,切缝护壁爆破技术充分利用了爆炸能量,有较好的应用前景。
The blasting process and mechanical behavior of the new technology of cutting seam wall blasting are theoretically analyzed. The dynamic photoelasticity test of this technology has been completed, and the contour of the kerf is obtained. Through the analysis of the fringe pattern, it is shown that when the kerf is broken, the explosive product first has an effect on the hole wall at the kerf, and then has an effect on the direction of the free surface, and finally acts on the direction of the wall, The smaller it is. Due to the presence of the wall material, the impact of the explosive products on the direction of the wall can be greatly reduced. The difference of the shear stress between the surface and the wall is as high as 1.75 times. It is a medium for forming a smooth blasting cracking surface and a crushing temporary surface The theoretical analysis and experimental results show that the technology of cutting seam wall blasting fully utilizes the explosive energy and has a good prospect of application.