冻土的土壤电阻率影响因素及接地特性研究

Influence Factors of Soil Resistivity and Grounding Characteristics of Frozen Soil

冬季土壤受冻结作用影响,土壤电阻率明显升高。本研究提出了一种土壤导电模型,搭建了土壤电阻率测量试验平台,依据蒙东地区冬季环境的温度与土壤分层结构调研结果,设计不同含水量的黄土与砂土土壤样本在-20℃的恒温密闭环境内的冻土试验,对比分析不同样本的土壤电阻率随温度的变化情况与规律,将试验结果应用于变电站实例,计算分析土壤电阻率的升高对接地电阻、接触电压和跨步电压的影响规律。

The soil is affected by freezing in winter and the soil resistivity increases significantly.The author proposes a soil conductivity model and builds a soil resistivity measurement test platform.Based on the survey results of the temperature and soil layered structure in the winter environment in eastern Inner Mongolia,the loess and fine sand samples with different moisture contents are designed to be at a constant temperature of-20℃.Frozen soil test in a closed environment,compare and analyze the change and law of soil resistivity of different samples with temperature.The test results are applied to a substation example to calculate and analyze the influence of the increase of soil resistivity on the ground resistance,contact voltage and step voltage.