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本文研究了三层介质中膨胀球模拟震源的应力、应变场以及由这个应力、应变场产生的电阻率变化量和地表视电阻率变化的关系。结果表明,对于一定强度的“震源”,在地电装置探测范围内的应力场随具有不同弹性参数的层位有显著的变化;而应变场却看不出有明显的突变;由地表视电阻率变化量的计算结果揭示了地电异常受台站介质电性结构与力学结构的综合影响。因此作为预报地震的地电阻率法一方面要寻找具有高电阻率——应变灵敏度岩层的台址,另一方面台址的视电阻率变化对各层真电阻率变化要具有好的响应。
In this paper, we study the stress and strain fields of the expansive sphere in a three-layer medium and the relationship between the resistivity variation caused by this stress and strain field and the apparent apparent resistivity. The results show that for a certain intensity of “source”, the stress field in the detection range of the geoelectric device varies significantly with the layers with different elastic parameters; however, the strain field does not show obvious mutations; the surface apparent resistance The calculation results of rate variation reveal that the geoelectric anomaly is affected by the combined effect of the electrical structure and mechanical structure of the station medium. Therefore, as the earth resistivity method for earthquake prediction, it is necessary to look for a site with a high resistivity-strain sensitivity rock formation on the one hand, and the change of apparent resistivity at the site to have a good response to the change of the real resistivity of each layer.