炮孔水压预裂爆破的实验研究

EXPERIMENTAL STUDY ON HOLE PRE SPLITTING BLASTING WITH WATER PRESSURE

介绍了水压预裂爆破的实验研究和爆炸应变场的近区测试结果。采用应变砖作为传感器，用动态分析仪作为分析处理设备。实验对比分析了空气不偶合装药、普通水不偶合装药及预加不同静水压力的水不偶合装药爆破效果。结果表明，水作为不偶合介质能提高爆生气体压缩作用产生的准静态应力场的作用时间，预加一定的静水压力对孔壁初始裂纹的产生起导向作用，从而只在炮孔连线方向产生初始裂纹。炮孔水压预裂爆破能量利用率高，爆破效果好，因此可获得更好的成缝质量和裂面质量。

This paper introduces the experimental study on presplitting blasting with water pressure.Strain gauge is adopted here as sensor and also dynamic analyzer as analyzing instrument.Air decoupling is compared with water decoupling blasting through lab tests.We certificated that the hole presplitting blasting with water pressure presente give longer quasi static stress effect time.The pre pressure can predominate the cracking direction of the initial crackle and is of high energy utilization effect and good blasting effect.The cracking mechanism of presplitting blasting with water pressure is analyzed preliminaring.