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本文定量分析地温、地下水位变化对视电阻率的影响。首先建立与地温、地下水位变化相应的地电断面,这种断面的电性不是分层均匀的,然后用有限单元法计算视电阻率。计算结果表明,对与临沂地电台相近的地电断面,地下水位的变化对视电阻年变的影响大于地温年变的影响,前者约为后者的两倍。基岩对年变大小有强烈的控制作用,基岩浅,年变明显,基岩深,年变大为减弱。
This paper quantitatively analyzes the influence of the change of ground temperature and groundwater level on the apparent resistivity. Firstly, the geoelectric section corresponding to the change of ground temperature and groundwater level is established. The electrical properties of this section are not uniform and then the apparent resistivity is calculated by the finite element method. The calculation results show that for the geoelectric section similar to Linyi station, the change of groundwater level has more influence on the apparent resistivity change than the annual change of geothermal temperature, the former is about twice of the latter. Bedrock has a strong controlling effect on the annual variation. The bedrock is shallow, the annual change is obvious, the bedrock is deep, and the annual change is greatly weakened.