Effects of Heat and Moisture Transfer on Stray Currents of Urban Rail Transit by Different Types of Soil in Lanzhou
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.
Urban rail transitStray currentSoil temperatureSoil moisture contentExperimental testEntropy weight law
万方数据
维普
