瞬态电磁耦合法检测与识别硐室爆破盲炮的可行性探讨

为探明硐室爆破中的盲炮,在瞬变电磁法的基础上进行改进形成瞬态电磁耦合法,进行盲炮检测与识别的可行性理论分析与实验论证。在硐室内预置电磁灵敏感应器,在地表布置瞬态电磁耦合检测系统,检测炸药爆炸前后电磁场异常状况来实现硐室爆破盲炮检测与识别。结果表明,电磁灵敏感应器在感应耦合的作用下产生规则化涡流,在复杂的地形地质条件下,可以检测与识别出埋深不超过55m的单个盲炮;药室内的电雷管可能产生的感应电流远小于安全电流,可确保检测过程中电雷管的安全;但对于存在多个盲炮瞬态电磁耦合法难以精确的检测与识别。

FEASIBILITY STUDY ON THE TRANSIENT ELECTROMAGNETIC COUPLING METHOD IN DETECTION AND IDENTIFICATION OF MISFIRE IN CHAMBER BLASTING

To verify the misfire in the chamber blasting,the transient electromagnetic coupling method on the basis of transient electromagnetic method for demonstrating the feasibility of misfire detection were conducted.Electromagnetic sensitive sensors were presented in chamber and detection system of transient electromagnetic were arranged in the earth s surface to detect abnormal condition of electromagnetic field before and after the explosion.The result showed that eddy current were produced by electromagnetic sensitive sensors under the control of inductive coupling.The cover depth of single misfire less than 55 meters could be detected and identified under complicated geological conditions.The induced current might produced by electric detonator in the chamber was much less than the safe current.It s difficult for transient electromagnetic coupling method to detect and identify accurately for several misfires.