The finite element modelling of iron interference on earth resistivity of Yanqing station
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摘要: 近年来延庆台地电阻率观测多次出现因环境干扰而引起的较为显著的异常变化，尤其是观测环境中铁质干扰源对地电阻率观测的幅度和形态的影响.本文依据台站测区地下高密度电性结构剖面和电测深结果建立了三维数值模型，分析了几种铁质对延庆台地电阻率观测的影响幅度和形态，结果表明，在扣除地电阻率基准值后，干扰幅度和形态与实际观测值的异常变化较吻合，从而从数值分析的角度确定了地下铁质对延庆地电阻率观测的干扰.Abstract: In recent years, resistivity observation in Yanqing station appeared with more than once remarkable anomalies caused by environmental interference, especially the iron interference on disturbance amplitude and pattern. According to underground high density electric structure profile and electrical sounding of Yanqing station, we established a three-dimensional numerical model to analyze the influence from several iron media on the amplitude and the pattern of the earth resistivity. The results showed that after deducted the reference value of earth resistivity, the disturbance amplitude and pattern tallied with the actual observed anomalies, which verified that the iron medium has interference on earth resistivity observation from the perspective of numerical analysis.
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图 2 延庆地电阻率观测线路布极图
Figure 2. Electrodes arrangement for resistivity observation at Yanqing station
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图 3 1995—2016年延庆台地电阻率观测数据月均值曲线
Figure 3. The monthly mean value curves of georesistivity observation data at Yanqing station from 1995 to 2016
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图 6 延庆台地电阻率有限元模型示意图
Figure 6. The three-dimensional finite element model of georesistivity at Yanqing station
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图 7 有限元模型计算值和解析解曲线
Figure 7. The numerical results and analytic solution curve of the finite element model
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图 8 延庆台地电阻率观测数据及有限元分析
Figure 8. Georesistivity observation data and finite element analysis for Yanqing station
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图 9 铁脚架(a)和铁质地基(b)干扰的有限元分析
Figure 9. Finite element analysis for three-dimensional structures of the iron frame (a) and the iron foundation (b)
表 1 2002年延庆地电阻率有限元模拟计算得到的干扰源年变化量
Table 1 Annual variations of interference sources calculated from FEM simulation for georesistivity of Yanqing station in 2002
月份 干扰源年变化量 EW测向/(Ω·m) NS测向/(Ω·m) 1 -0.236 0.111 2 -0.242 0.070 3 -0.227 0.165 4 -0.283 -0.144 5 -0.273 -0.104 6 -0.249 -0.054 7 -0.231 -0.025 8 -0.249 0.026 9 -0.246 0.049 10 -0.242 0.070 11 -0.227 0.165 12 -0.239 0.091 
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表 2 铁脚架有限元分析的干扰量
Table 2 Disturbances achieved from finite element analysis of iron frame
月份 干扰源年变化量 EW测向/(Ω·m) NS测向/(Ω·m) 2014-10 0.0017 -0.0004 11 0.0019 -0.0005 12 0.0023 -0.0007 2015-01 0.0027 -0.0007 02 0.0023 -0.0007 03 0.0019 -0.0005 2015-04 0.0018 -0.0005 05 0.0016 -0.0005 06 -0.0035 -0.0004 07 -0.0218 -0.0003 08 -0.0195 -0.0002 09 -0.0292 -0.0002
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表 3 铁地基有限元分析的干扰量
Table 3 Disturbances achieved from finite element analysis of iron foundation
月份 干扰源年变化量 EW测向/(Ω·m) NS测向/(Ω·m) 2014-10 -0.0049 -0.0029 11 -0.0016 -0.0013 12 -0.0054 -0.0015 2015-01 0.0055 -0.0013 02 0.0013 -0.0093 03 -0.0019 -0.0069 2015-04 -0.0022 -0.0004 05 0.0044 -0.0012 06 -0.0052 -0.0006 07 -0.0332 -0.0023 08 -0.0540 -0.0008 09 -0.0425 -0.0033
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