土壤结构对城轨中杂散电流分布的影响分析

Influence of Soil Structure on Stray Current Distribution in Urban Rail Transit

杂散电流分布受列车运行工况、供电区间长度、钢轨过渡电阻和土壤结构等多因素影响。研究杂散电流的影响因素是防治杂散电流的基础。为了研究土壤结构对城市轨道交通中杂散电流分布的影响,构建含多层土壤结构的杂散电流仿真模型。基于该仿真模型,分析均匀土壤、分层土壤中电阻率、土壤厚度等参数对杂散电流分布的影响。仿真结果表明,土壤结构会影响排流网、辅助排流和大地中的电流分布,而对沿线钢轨电位和总的杂散电流分布几乎没有影响。此外,在分层土壤结构中,首层土壤厚度越小或电阻率越大,流向大地中的杂散电流越少。

Harmful stray current has become a prominent problem with the rapid development of urban rail transit.The distribution of stray current is affected by several factors,such as train operating conditions,length of the power supply section,rail transition resistance,and soil structure.Studying the influencing factors of the stray current is required for preventing it.In this study,a stray current simulation model with a multi-layer soil structure is constructed to study the influence of soil structure on the distribution of stray current in urban rail transit.Based on this model,the effects of resistivity and soil thickness in uniform and layered soil on the stray current distribution are analyzed.The simulation results show that the soil structure affects the current distribution in the drainage network,auxiliary drainage,and the ground,but has little effect on the rail potential and the total stray current distribution along the line.In addition,in the layered soil structure,the less the thickness of the first layer of soil or the greater the resistivity,the less stray current flows to the earth.