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本文依据吉林省四平台地质剖面、地下介质电性资料,将四平台地下介质电性分布简化为沿NW走向的二维电性结构,并结合台站电测深资料建立三维有限元模型,以模型浅层介质电阻率变化模拟测区浅层介质电阻率随季节的变化,计算了四平台N50°W和N40°E两测道地电阻率的年变化形态.计算结果表明,N50°W测道地电阻率在浅层介质电阻率升高时上升,在浅层介质电阻率降低时下降;N40°E测道地电阻率在浅层介质电阻率升高时下降,在浅层介质电阻率降低时升高.两测道地电阻率年变化表现出相反的形态,且N50°W测道年变幅度要大于N40°E测道,计算结果在变化形态上符合四平台实际的观测资料,因此认为四平台测区地下介质的非均匀分布是产生两测道地电阻率年变形态相反现象的原因.
Based on the geologic profile of the four platforms in Jilin Province and the electrical properties of the subterranean media, this paper simplifies the electrical distribution of the subterranean media in the four platforms to a two-dimensional electrical structure along the NW. Combined with the station sounding data, a three-dimensional finite element model Model resistivity changes of shallow medium simulated the change of resistivity of shallow medium with seasons, and calculated the annual variation of resistivity of N50 ° W and N40 ° E on four platforms.The calculated results show that N50 ° W The resistivity of the land increases with the increase of the resistivity of the shallow medium and decreases with the decrease of the resistivity of the shallow medium. The resistivity of the N40 ° E observatory decreases with the increase of the resistivity of the shallow medium, The annual change of resistivity of the two tracks showed opposite morphology, and the annual variation range of N50 ° W was greater than that of N40 ° E. The calculated results accorded with the observed data of four platforms in the changing morphology, Therefore, it is considered that the inhomogeneous distribution of underground media in the four-zone test area is the reason that causes the opposite phenomenon of the annual variation of resistivity of two measuring stations.