单自由面垂直炮孔爆破残孔长度研究

Study on the Residual Length of Vertical Hole with Single Face

在分析单自由面垂直炮孔装药爆破作用特性的基础上 ,探讨了残孔形成的机理 ,进行了单自由面垂直炮孔装药的爆破漏斗模型试验。研究结果表明 :由于炮孔深部岩石的夹制作用 ,炮孔装药爆破后易产生一定量的残孔 ,而采用孔内装药分段微差爆破则能减少残孔长度 ,提高爆破效率。

In the light of the blasting characteritics of vertical hole column charge in rock, the mechanism of producing residual hole was analyzed, and the blasting funnel model test on vertical hole with single free face was conducted. The result shows that residual hole is resulting from rock extruding, and that residual length of hole can be reduced as application of divided charge and millisecond delay firing in hole.