矿井瞬变电磁金属干扰响应特征与校正方法
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摘要
为了消除巷道内金属干扰对矿井瞬变电磁探测的影响,以常见的铁轨干扰源为例,采用井下实验方法系统分析了铁轨影响下不同距离、不同方向和不同探测模式等情况的瞬变电磁响应特征和影响规律,发现铁轨的存在导致感应电动势幅值增大,且不同情况的探测响应差异较大。通过计算有无干扰的归一化感应电动势比值得到各时间窗的校正系数,在其基础上提出拟合函数校正法,并将其应用到某煤矿工作面顶板探测中。实际应用结果表明:基于拟合函数的校正方法能够较好的剔除干扰异常,准确反映煤层顶板含水异常区的范围和赋水程度,明显提高金属干扰下矿井瞬变电磁探测含水异常区的准确性。
In order to eliminate the effect of metal facilities in the roadway on mine transient electromagnetic surveying,take trail interference sources for example,the transient electromagnetic response characteristics were analyzed by method of field experiment,with different distance,direction and modes between the wire-frame and tracks.It showed that the induction electromotive force amplitude increased under the influence of the tracks,and there was great difference of the response characteristics obtained in different condition.By calculating the induction electromotive force ratio of different time windows in interference and non-interference environment,the correction method of fitting function was proposed,and was used to correct the disturbed data of practical engineering.The results show that the fitting function correcting method can remove the abnormal interference in disturbed data,and better reflect the feature of abnormalities in coal seam roof,improving the detection accuracy of water anomaly by method of mine transient electromagnetic survey.
In order to eliminate the effect of metal facilities in the roadway on mine transient electromagnetic surveying,take trail interference sources for example,the transient electromagnetic response characteristics were analyzed by method of field experiment,with different distance,direction and modes between the wire-frame and tracks.It showed that the induction electromotive force amplitude increased under the influence of the tracks,and there was great difference of the response characteristics obtained in different condition.By calculating the induction electromotive force ratio of different time windows in interference and non-interference environment,the correction method of fitting function was proposed,and was used to correct the disturbed data of practical engineering.The results show that the fitting function correcting method can remove the abnormal interference in disturbed data,and better reflect the feature of abnormalities in coal seam roof,improving the detection accuracy of water anomaly by method of mine transient electromagnetic survey.
引文
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[9]周璇,刘树才,常江浩,等.金属棚支架对矿井瞬变电磁探测影响及校正技术[J].煤炭科学技术,2014,42(11):101-104.
[10]孙怀凤,李貅,卢绪山,等.隧道强干扰环境瞬变电磁响应规律与校正方法:以TBM为例[J].地球物理学报,2016,59(12):4720-4732.
[11]于景邨.矿井瞬变电磁法理论与应用技术研究[D].徐州:中国矿业大学,2001.
[2]张欢,彭刘亚.矿井瞬变电磁场井下人文噪声干扰物理模拟[J].工程地球物理学报,2010,7(6):679-683.
[3]于景邨,刘树才,王扬州.巷道内金属体瞬变电磁响应特征及处理技术[J].煤炭学报,2008,33(12):1403-1407.
[4]王明明,刘志新,雷枫.铁轨影响下煤层底板瞬变电磁探测技术应用[J].煤矿安全,2013,44(4):162-164.
[5]周嗣辉,于景邨,常江浩,等.锚网支护下矿井瞬变电磁响应特征及处理技术研究[J].矿业安全与环保,2014,41(3):17-23.
[6]张军.矿井瞬变电磁超前探测干扰校正技术研究[J].物探化探计算技术,2017,39(1):17-22.
[7]范涛,安绍鹏,王秀臣,等.煤矿采空区探测中的瞬变电磁干扰压制[J].物探与化探,2012,36(6):1006-1009.
[8]胡雄武,张平松,成桦,等.井下瞬变电磁法超前探测中锚杆干扰定量评价[J].岩石力学与工程学报,2013,32(S2):3275-3282.
[9]周璇,刘树才,常江浩,等.金属棚支架对矿井瞬变电磁探测影响及校正技术[J].煤炭科学技术,2014,42(11):101-104.
[10]孙怀凤,李貅,卢绪山,等.隧道强干扰环境瞬变电磁响应规律与校正方法:以TBM为例[J].地球物理学报,2016,59(12):4720-4732.
[11]于景邨.矿井瞬变电磁法理论与应用技术研究[D].徐州:中国矿业大学,2001.