瞬变电磁法用于检测与识别硐室爆破盲炮的可行性探讨

Feasibility study of the transient electromagnetic method for chamber blasting misfire detection and recognition

应用瞬变电磁法对硐室爆破盲炮的检测与识别进行了可行性研究。试验时先确立电磁背景场,然后在硐室中预置良性导体并测得电磁场后消除背景场,在爆破后再次进行瞬变电磁测量。通过对比爆破前后预置良性导体涡流场的变化,实现硐室爆破盲炮检测与识别的目的。试验结果表明,当铝箱目标体埋深不超过30 m时,瞬变电磁检测法可以明确地确定铝箱的位置;当铝箱埋深超过30 m后,铝箱形成的二次涡流场层次不明,不能确定铝箱的埋深与位置。

In this paper,transient electromagnetic method was used to carry out the feasibili-ty study on the detection and recognition of chamber blasting misfire. First,an electromagnetic background field was established in the test;second,a benign conductor was preset in the chamber,and then the background field was eliminated after the electromagnetic field was mea-sured;finally,the transient electromagnetic field was measured again after blasting;at last, the chamber blasting misfire was detected and recognized by comparing the change of vortex field of the preset benign conductor before and after blasting. The test results showed that：When the buried depth of aluminum box target was no more than 30 m,transient electromag-netic method can clearly identify the position of the aluminum box;when the buried depth of aluminum box was more than 30 m,the buried depth and position of the aluminum box was not sure due to the unknown level of secondary vortex field generated by aluminum box.