渠道混凝土衬砌与基土界面冻胀温度特性研究Characteristics of frost heave temperature of concrete lining and foundation
刘政;申向东;薛慧君;王仁远;刘倩;韩超;
摘要(Abstract):
通过室内冻结试验,研究渠道混凝土衬砌与渠床基土两材料相互接触界面的温度变化,分析试验结果可知界面温度时程变化可划分为3个阶段:急速阶段、缓慢阶段和平稳阶段。结合材料力学、冻土力学等理论,利用温度场、温度梯度和温度应力计算公式得出界面温度应力变化特性。在冷端温度降低过程初期,混凝土内部温度变化较基土更为敏感;界面温度达-12℃时,界面温度应力的增速由快变慢且存在转折点,该转折点使温度应力对界面的破坏速率减慢,温度应力大于0.4MPa时会对界面有破坏效应;界面温度达-15℃时,应力达到最大值。室内冻结试验与灌区渠道冻胀变化趋势基本一致,具有实践应用价值。
关键词(KeyWords): 界面;温度场;温度梯度;温度应力;渠道混凝土
基金项目(Foundation): 国家自然科学基金资助项目(51569021,51769025)
作者(Author): 刘政;申向东;薛慧君;王仁远;刘倩;韩超;
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