随着城市轨道交通的快速发展，杂散电流的危害日益突出。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，构建了含多层土壤结构的杂散电流仿真模型。基于该仿真模型，分析了均匀土壤、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。

The harm of stray current is becoming more and more prominent with the rapid development of urban rail transit. The distribution of stray current is affected by many factors, such as train operating conditions, length of power supply section, rail transition resistance and soil structure. Studying the influencing factors of stray current is the basis of preventing stray current. In order to study the influence of soil structure on the distribution of stray current in urban rail transit, a stray current simulation model with multi-layer soil structure was constructed in this paper. Based on the simulation model, the effects of resistivity and soil thickness in uniform soil and layered soil on stray current distribution were analyzed. The simulation results show that the soil structure will affect the current distribution in the drainage network, auxiliary drainage and the earth, 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 smaller the thickness of the first layer of soil or the greater the resistivity, the less stray current flows to the earth.

U239.5? ??

四川省重点研发项目（2021JDRC0113）