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    陈佩佩, 金铭, 张桓伟, 郭志光, 白冰, 诸瑞松. 复杂温度路径下非饱和土的热-水-力耦合响应特性[J]. 应用基础与工程科学学报, 2024, 32(5): 1294-1306. DOI: 10.16058/j.issn.1005-0930.2024.05.007
    引用本文: 陈佩佩, 金铭, 张桓伟, 郭志光, 白冰, 诸瑞松. 复杂温度路径下非饱和土的热-水-力耦合响应特性[J]. 应用基础与工程科学学报, 2024, 32(5): 1294-1306. DOI: 10.16058/j.issn.1005-0930.2024.05.007
    CHEN Peipei, JIN Ming, ZHANG Huanwei, GUO Zhiguang, BAI Bing, ZHU Ruisong. Thermal-Hydro-Mechanical Coupling Response Characteristics of Unsaturated Soil Under Complex Temperature Paths[J]. Journal of Basic Science and Engineering, 2024, 32(5): 1294-1306. DOI: 10.16058/j.issn.1005-0930.2024.05.007
    Citation: CHEN Peipei, JIN Ming, ZHANG Huanwei, GUO Zhiguang, BAI Bing, ZHU Ruisong. Thermal-Hydro-Mechanical Coupling Response Characteristics of Unsaturated Soil Under Complex Temperature Paths[J]. Journal of Basic Science and Engineering, 2024, 32(5): 1294-1306. DOI: 10.16058/j.issn.1005-0930.2024.05.007

    复杂温度路径下非饱和土的热-水-力耦合响应特性

    Thermal-Hydro-Mechanical Coupling Response Characteristics of Unsaturated Soil Under Complex Temperature Paths

    • 摘要: 复杂温度路径下非饱和土热-水-力多场耦合研究在交通岩土和工程地质等方面有着重要的意义.考虑孔隙比和温度影响效应修正经典土水特征曲线模型,从而更准确地确定热-水-力耦合数值建模所涉及的关键耦合参数.通过与室内模型试验结果的对比验证,证实了数值模型的精度和可靠性.针对周期循环和指数增长两类典型的温度路径作用下非饱和土热-水-力多场耦合响应特性开展分析,研究结果表明:周期温度荷载作用下温度和饱和度循环变化过程呈现出与温度荷载相同的周期;且其周期变化中均有相位延滞和波幅衰减现象,且距离热源越远,波幅衰减越大;测点总位移亦随温度荷载发生相同周期的循环变化,然而并未出现相位延滞情况,距离热源越近,总位移的波幅越大.在指数增长温度路径下,各测点的饱和度和温度具体表现为先减小后增大,越靠近热源的测点,减小的程度越大且越早达到极低点,而后迅速抬升到稳定阶段;然而总位移曲线却呈现为与温度曲线不同的演变特征.

       

      Abstract: The study of thermo-hydro-mechanical (THM) coupling in unsaturated soils under complex temperature paths is of significant importance in the fields of traffic geotechnics and engineering geology.This research modifies the classical soil-water characteristic curve model by incorporating the effects of porosity and temperature,thus providing a more accurate determination of the parameters involved in THM coupling numerical modeling.The accuracy and reliability of the numerical model were validated through comparison with experimental results.An analysis was conducted on the THM coupling response characteristics of unsaturated soil under two typical temperature paths of periodic cycle and exponential growth.The results indicate that under cyclic temperature loading,the temperature and saturation undergo cyclical changes that mirror the temperature load cycle.Phenomena such as phase lag and amplitude attenuation are observed within these cycles,with amplitude attenuation increasing with distance from the heat source.Additionally,the total displacement of measurement points exhibits cyclical changes in sync with the temperature load,without phase lag,and the amplitude of total displacement increases closer to the heat source.Under exponential growth temperature paths,the saturation and temperature of the measurement points first decrease and then increase.Points closer to the heat source show a greater degree of decrease and reach their lowest points earlier before rapidly rising to a stable stage.However,the total displacement curve evolves differently from the temperature curve.

       

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