环境温度及含水率对土体温度场影响研究

Study on the effect of ambient temperature and water content on soil temperature field

通过模型试验和数值模拟的方法,研究了环境温度和土体含水率对冻土温度场的影响。结果表明:冻结过程中土体内温度场变化只表现为降温阶段、平稳变化阶段及再降温阶段,过冷阶段表现不明显;环境温度变化对降温阶段影响较小,对平稳变化阶段和再降温阶段影响较大,环境温度越低,平稳变化阶段持续时间越长,再降温阶段同一时刻同一深度处温度越低;含水率的变化对土体内温度场的影响在降温阶段较小,对平稳变化阶段和再降温阶段影响相对较大,含水率越大,平稳变化阶段持续时间越短,再降温阶段同一时刻同一深度处温度越低;且模型试验得到的冻土温度场变化规律与数值模拟结果基本一致。研究结果可为冻土地区工程建设及对冻土的进一步研究提供参考。

The effect of ambient temperature and soil moisture content on frozen soil temperature field is studied by model test and numerical simulation.The results show that the temperature field in the soil only shows the cooling stage,the stable change stage and the re-cooling stage,and the performance is not obvious in the undercooling stage.The change of ambient temperature has little effect on the cooling stage,but has great effect on the stationary change stage and the re-cooling stage.The lower the ambient temperature is,the longer the duration of the stationary change stage is,and the lower the temperature at the same depth at the same time in the re-cooling stage is.The change of water content has less effect on the temperature field in the cooling stage,but has more effect on the stable change stage and the re-cooling stage.The larger the water content is,the shorter the duration of the stable change stage is,and the lower the temperature at the same depth at the same time in the re-cooling stage is.The variation law of frozen soil temperature field obtained by model test is basically consistent with the numerical simulation results.The research results can provide reference for engineering construction and further research on frozen soil in permafrost region.