223 / 2022-03-14 19:49:05

Study on soil conductive path based on micro-element statistical method

Grounding; soil resistance rate; fractal; porous media; pore structure

Soil conductivity will directly determine the stability of grounding system, and the cost of grounding system will vary from tens to hundreds of times due to the difference of soil resistivity under the same grounding resistance. Soil, as a porous medium, has a large number of pores between solid mineral particles, and ions can migrate through the channels formed by pore water, thus forming electric currents. Existing studies have found that there is a sudden change in soil resistivity with the change of water content, but it can only be macroscopically speculated that it is caused by the connectivity of water distribution. By AYSYS simulation software, write a program to build soil fractal model, to analyze the soil electrical conductivity, study its conductive mechanism and the influencing factors, and the micro-element statistical method is used to statistically analyze and study the apparent conductivity of the water in the soil micro element, and the soil resistivity at different time before and after the mutation of connectivity and statistical soil conduction path. By controlling the variation of porosity and water content, it is found that the ratio of the soil conductivity path area to the plane area of the whole model conforms to the law of the change of water conductivity when the soil resistivity changes suddenly.