兰州地区不同类型土壤热湿传递对城市轨道交通杂散电流的影响  

Effects of Heat and Moisture Transfer on Stray Currents of Urban Rail Transit by Different Types of Soil in Lanzhou

作　　者：王烨[1,2,3] 李永全 朱欣悦 党闻语 梁凯 WANG Ye;LI Yongquan;ZHU Xinyue;DANG Wenyu;LIANG Kai(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China;Key Laboratory of Railway Vehicle Thermal Engineering,Ministry of Education,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China;Engineering Research Center of Water Resource Comprehensive Utilization in Cold and Arid Regions,Ministry of Education,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]兰州交通大学铁道车辆热工教育部重点试验室,甘肃兰州730070 [3]寒旱地区水资源综合利用教育部工程研究中心,甘肃兰州730070

出　　处：《中国铁道科学》2024年第6期22-32,共11页China Railway Science

基　　金：国家自然科学基金资助项目(51476073);甘肃省自然科学基金资助项目(21JR7RA304);甘肃省高等学校产业支撑计划项目(2023CYZC-38);甘肃省教育厅高校科研创新平台重大培育项目(2024CXPT-14)。

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%。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.

关 键 词：城市轨道交通 杂散电流 土壤 温度 含水率 热湿传递 试验 熵权法 

分 类 号：U239.5[交通运输工程—道路与铁道工程]