QUANTITATIVE ASSESSMENT OF INTERFERENCE INDUCED BY ROOF BOLT DURING ADVANCED DETECTION WITH TRANSIENT ELECTROMAGNETIC METHOD IN MINE
HU Xiongwu1，ZHANG Pingsong1，CHENG Hua2，WU Rongxin1，GUO Liquan1
(1. School of Earth and Environment，Anhui University of Science and Technology，Huainan，Anhui 232001，China；
2. School of Civil Engineering and Architecture，Anhui University of Science and Technology，Huainan，
Anhui 232001，China)
Abstract：During the process of roadway construction in mine，the effect of advanced water exploration using transient electromagnetic method is often poor because of the interferences of electromagnetic field，in which the metal interfering the most. So，the study for the interference characteristic of metal has an important significance to improve the technology of advanced water exploration. For advanced detection，the roof bolt can be suggested as the main interference source，and the experiment of entity model is designed as its practical situation in working face. The test data analysis shows that the interference degree and stamp of roof bolt are decided by its own spatiality，including the plane coordinates(x，y) and the exposed length(L). The maximum jamming range of roof bolt d is confirmed as 3 m primarily. Among this range，the areas interfering strongly range from 0m to 1.5m and the weak range from 1.5 m to 3.0 m. And the sensitive variation range of interference by the roof bolt?s exposed length distribution is delimitated from 0 m to 0.5 m，but the range from 0.5–1.7 m remains basically stable. In addition，through the contrast between the superposed and measured values，the values of combination interference signal induced by two roof bolts are approximately equal to the vertical stacking of the amplitude of transient electromagnetic field induced by any one of roof bolts respectively. The achievements can provide a rule for the research on the technology of interference correction of metal. Last，the paper point that the validity of test data influenced by roof bolts need an intensive study.
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2013, Vol. 32 
