软岩隧洞中乳化炸药拒爆的解决办法

为解决在软岩隧洞掘进爆破中乳化炸药发生拒爆的问题,通过分析乳化炸药破乳的原因,发现乳化炸药在爆炸环境中结构成分容易发生变化。研究结果表明,在分段延时爆破作业中,先引爆的炮孔产生的冲击波会对其作用范围内后引爆炮孔中的炸药产生挤压作用,被挤压的部分微小敏化气泡消失,导致乳化炸药破乳失效。盐边县偏路水库泄洪排沙隧洞爆破工程的实验,验证了在不改变爆破器材的情况下,可以通过改变装药结构,调整布孔参数以及起爆顺序成功克服乳化炸药在软岩隧洞掘进爆破中发生的拒爆问题,并取得了良好的爆破效果,可为类似爆破工程提供参考。

Solution of emulsion explosive misfire in soft rock tunnel blasting

In order to solve the problem of emulsion explosive misfire in soft rock tunnel blasting,it was found that the structure composition of emulsion explosive was easy to change in the explosion environment through analyzing the reason of demulsification.The research found that in section delay blasting operation,the shock wave generated first detonated had the extrusion effect on the explosive after detonated within its scope.Part of the squeezed tiny sensitized bubbles disappeared,which lead to demulsification failure.The experiment of the blasting project of the reservoir tunnel in Yanbian county was taken.It was verified that the problem of the emulsion explosive misfire in the soft rock tunnel excavation blasting could be successfully overcome by changing the charge structure,adjusting the parameters of the blastholes and the initiation sequence.A good blasting effect was achieved and it could provide a reference for similar blasting projects.