【摘要】 为研究土壤温湿度对城市轨道交通杂散电流分布的影响，采用试验与数值模拟相结合的方法研究兰州地区不同气象参数条件下杂散电流随土壤热湿传递的变化规律，分析不同深度土壤温湿度对电流密度的影响，运用熵权法得到土壤温湿度对电流密度的影响权重。结果表明：壤土、砂土及砂石土中杂散电流均随含水率的减小而减小，在土壤温度上升幅度较大时，杂散电流呈小幅度上升趋势；砂石土的杂散电流最小，可知其比壤土和砂土更有利于减小杂散电流的泄漏量；土壤深度为10 cm时，高温季节温度对杂散电流密度的影响权重值小于含水率；土壤深度为30 cm时，3种土壤在高温季节和低温季节时均是温度对杂散电流密度的影响权重更大，其温度对杂散电流密度的影响权重高温季节为55%～64%，低温季节为68%～69%。更多还原

【Abstract】 To study the influence of soil temperature and moisture on the stray current distribution in urban rail transit, this study combines experimental and numerical simulations to explore the variation laws of stray current with soil heat and moisture transfer under different meteorological parameters in Lanzhou. The influence of soil temperature and humidity at various depths on stray current density is analyzed. The entropy weight method is used to determine the weight of the influence degree of soil temperature and moisture in influencing the current density. The results show that stray currents in loam, sandy soil, and sandy stony soil decrease with the decrease of moisture content. When the soil temperature increases significantly the stray current increases slightly. Sandy stony soil exhibits the smallest stray currents, indicating that sandy stony soil is more effective in reducing the leakage of stray current than loam and sandy soil. At the soil depth of 10 cm, the influence weight value of temperature on stray current density in high-temperature seasons is less than that of moisture content.At the soil depth of 30 cm, the influence weight value of temperature on stray current density is greater in the three soils in both high-and low-temperature seasons. The influence weight of temperature on stray current density ranges from 55%-64% in high-temperature seasons and 68%-69% in low-temperature seasons.更多还原