井下瞬变电磁法超前探测中锚杆干扰定量评价  

QUANTITATIVE ASSESSMENT OF INTERFERENCE INDUCED BY ROOF BOLT DURING ADVANCED DETECTION WITH TRANSIENT ELECTROMAGNETIC METHOD IN MINE

作　　者：胡雄武[1] 张平松[1] 程桦[2] 吴荣新[1] 郭立全[1] 

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《岩石力学与工程学报》2013年第S2期3275-3282,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金重点项目(51134012);安徽省科技攻关计划项目(11010401015)

摘　　要：矿井巷道掘进过程中,利用瞬变电磁法超前探水因易受电磁干扰而使测试效果变差,尤以金属干扰最突出。因此,研究金属干扰特征对于井下水害超前探查技术的提高具有重要意义。针对超前探测情况,以锚杆作为主要干扰源,按现场实际干扰情况,设计井下实体模型试验。分析测试数据认为:锚杆对瞬变电磁探测的干扰程度及特征主要受其自身空间状态(x,y,L)决定;初步确定锚杆的最大干扰距离d为3 m,其中,1.5 m内具有强干扰,1.5~3.0 m区域干扰较弱;划定锚杆外露长度L在0.5 m内为干扰程度变化敏感区,0.5~1.7 m以上基本持水平状态。通过2根锚杆测试数据的对比,近似认为组合干扰信号为2根锚杆单独响应信号的垂直叠加,该结果为金属干扰的校正技术研究提供可循规律。最后,指出受金属干扰的数据需研究其有效性。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.

关 键 词：采矿工程 巷道掘进 瞬变电磁超前探测 实体模型试验 锚杆干扰 信号垂直叠加 

分 类 号：TD353.6[矿业工程—矿井建设] P631.325[天文地球—地质矿产勘探]