基于高速摄像技术的破孔导爆管传爆可靠性研究

采用高速摄像技术对单一、连续破孔特殊情况下的导爆管传爆可靠性进行了室内试验研究,试验采用的导爆管爆速平均为1750m/s。通过对高速摄像图的精细观察和测量分析,得出破孔导致导爆管管道效应被破坏后,对于单一破孔,维持导爆管可靠传爆的半破槽长度最大为15mm;15³0mm之间可能传爆,传爆几率随着半破槽长度增加而减小;超过30mm传爆失败;20mm单一半破槽导致的传爆延迟时间至少为195μs。对于连续破孔,半破槽长度及密集度越大,传爆可靠度越低,连续3个5mm半破槽的导爆管整体传爆时间延迟255μs。试验结论可对爆破施工现场的网路连接提供防范参考。

RESEARCH ON THE INFLUENCE TO DETONATION PROPAGATION RELIABILITY OF BROKEN HOLE NONEL TUBE BASED ON HIGH-SPEED PHOTOGRAPHY

Indoor laboratory experiments of the nonel tube detonation propagation reliability under different special circumstances had been conducted by using high-speed photography.The special circumstances included single broken hole nonel and continuous broken hole nonel.The average velocity of the normal nonel tube using in the test was 1750m/s.Through the observation and calculation analysis of the slow motion picture taken by the high-speed camera,the results showed that after the nonel's pipes were destroyed caused by broken holes,for single broken hole nonel,the maximum length of half-broken groove to maintain a reliable propagation was 15mm,and it may propagate successfully or maybe not when the length of half-broken groove was between 15mm and 30mm,the chance of propagating successfully decreased with the increased of half-broken groove′s length.When the length of half-broken groove exceeded 30mm,it would fail to propagate certainly.The delay time caused by 20mm single broken hole was 195μs at least.For continuous broken hole,the larger of the half-broken grooves′length and density,the lower reliability of the detonation propagation,and the overall delay time caused by 3continuous 5mm length half-broken groove was 255μs.The test conclusions can provide references and reasonable recommendations for the network connection on blasting construction site.