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张正,马学宁,王聪. 单向冻结条件下兰州地区黄土的温度场变化规律[J]. 科学技术与工程, 2020, 20(32): 13362-13368.
ZHANG Zheng,WANG Cong.Study on temperature field of loess in Lanzhou area under unidirectional freezing conditions[J].Science Technology and Engineering,2020,20(32):13362-13368.
单向冻结条件下兰州地区黄土的温度场变化规律
Study on temperature field of loess in Lanzhou area under unidirectional freezing conditions
投稿时间:2020-01-12  修订日期:2020-07-31
DOI:
中文关键词:  冻土  温度场  模型试验  数值模拟.
英文关键词:frozen soil  temperature field  model test  numeral calculation
基金项目:国家自然科学(41562014)
        
作者单位
张正 兰州交通大学 土木工程学院
马学宁 兰州交通大学 土木工程学院
王聪 兰州交通大学 土木工程学院
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中文摘要:
      为研究不同含水率黄土在单向冻结融化过程中温度场的变化规律,选取兰州地区黄土进行了封闭系统下的单向冻结融化试验。研究了在单向冻结过程中土体温度的变化规律,给出了土体温度的变化曲线。研究结果表明:土体的降温过程分为三个阶段,降温冻结初期各深度处土体温度的下降速率较快;土体温度下降至-0.4℃时降温曲线出现转折点,土层各深度降温曲线出现近乎平行于横坐标的平稳段;冻结后期各深度处土体的温度下降速率相对较慢。对比分析了模型试验中不同深度处各点温度的实测值与数值模拟值,结果表明:数值模拟的各点温度曲线与实测温度曲线变化规律基本一致,冻结阶段模拟的降温速度稍大于实测降温速度,融化阶段则相反。研究结果可为冻土地区工程建设提供参考。
英文摘要:
      In order to study the change law of temperature field of loess with different water content during unidirectional freezing and thawing, the loess in Lanzhou area was selected for the unidirectional freezing and thawing test under a closed system. The change law of soil temperature during one-way freezing is studied, and the change curve of soil temperature is given. The results show that the temperature of the soil is divided into three stages, and the temperature of the soil at each depth in the initial stage of cooling and freezing is faster; When the temperature of the soil drops to -0.4 ℃, the turning curve appears, and the cooling curve at each depth of the soil layer appears as a stable section almost parallel to the abscissa; The rate of temperature drop of soil at various depths in the late period of freezing is relatively slow. The measured and simulated values of temperature at various points in different depths of the model test are compared and analyzed. The results show that the temperature curve at each point of the numerical simulation is basically consistent with the measured temperature curve. The simulated cooling rate is slightly higher than the measured cooling rate during the freezing phase, and the reverse is true during the melting phase. The research results can provide references for engineering construction in frozen soil areas.
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