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利用新型全息动光弹，以南芬矿高台阶靠帮控制爆破的现场参数为实验模拟基础，研究了两预裂孔间应力波迭加的动态变化过程。在两炮孔均实行孔底和孔口同时起爆（四起爆点），并对孔底进行加强装药条件下，获得了不同时刻的等差条纹图。发现沿炮孔方向应力波分布有很大不同，提出了初始Ｐ波与后出现的Ｓ波迭加形成的波是所有波中最重要的部分。研究表明，孔底加强装药是深孔孔底产生预裂效果的关键因素，孔底连线上应力场强度不受端部效应影响。
Using the new holographic dynamic photoelastic system, the field parameters of the high-level abutment controlled blasting in Nanfen Mine are used as the basis of the experimental simulation. The dynamic variation process of stress wave between two pre-fractures is studied. At the same time, the hole bottom and the orifice were detonated at the same time (four explosion points), and the equal-difference fringe pattern at different time was obtained under the condition of strengthening the bottom of the hole. It is found that the distribution of stress wave along the borehole is quite different. It is proposed that the wave formed by the superposition of the initial P wave and the post S wave is the most important part of all the waves. The results show that the bottom hole strengthening charge is the key factor to produce the pre-cracking effect in the deep hole bottom hole. The stress field strength on the bottom hole connection is not influenced by the end effect.