【摘要】 研究城市轨道交通路基附近不同组分土壤内部温度、湿度变化对其电阻率的影响规律，对于获得土壤内部杂散电流的变化规律非常关键。采用实验和数值模拟相结合的方法进行研究；利用四极法获得不同组分的土壤温度、含水率对土壤电阻率的影响规律；运用响应面法的多因素分析，构建各组分土壤电阻率的响应面函数，得到土壤组分、温度与含水率等因素对土壤电阻率的影响关系；实测了多组分土壤不同深度处的杂散电流。结果表明：不同组分土壤电阻率均与土壤温度和含水率呈负相关；土壤温度、含水率和土壤组分3种要素中，含水率对土壤电阻率的影响最显著，土壤组分次之。由于太阳辐射强度及环境参数的变化，随着测试时间的延长，不同位置处混合土壤的含水率变化特征存在一定差异，土壤中杂散电流均随土壤深度和时间的增大而减小，越接近走行轨的土壤杂散电流越大。4种土壤在不等比混合的条件下，电阻率较大的土壤占比越高，土壤中的杂散电流值越低。更多还原

【Abstract】 Understanding the dynamics of stray current in soil, which is critically influenced by soil resistivity, requires a thorough investigation of how temperature and moisture variations in different soil components near urban rail transit subgrades affect resistivity. This study employed a hybrid approach integrating experimental investigations with numerical simulations. The four-electrode method was used to determine the effects of soil temperature and moisture content on the resistivity of various soil components. A multi-factor analysis using the response surface method was conducted to develop response surface functions for the resistivity of each soil component, thereby quantifying the effects of soil composition, temperature, and moisture content. Furthermore, in situ measurements of stray currents were conducted at various depths within the multi-component soils. The results indicate that the resistivity of all soil components is negatively correlated with both soil temperature and moisture content. Of the three factors of soil temperature, moisture content, and soil composition, moisture content emerges as the predominant factor affecting soil resistivity, with soil composition being the next most influential. Owing to variations in solar radiation and environmental conditions, the temporal evolution of moisture content in the mixed soil varies spatially over the test duration. Stray currents consistently decrease with increasing depth and time, and are higher in proximity to the running rails. For non-proportionally mixed soils, a higher fraction of the high-resistivity component results in lower stray current magnitudes.更多还原