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| Thermal contact resistance calculation at rock-lining interface in high-temperature tunnels with consideration of surrounding rock lithology |
Guangyao CUI1( ),Ziyang HE1,Daoyuan WANG2,3,Wenhao SHI4 |
1. School of Civil Engineering, North China University of Technology, Beijing 100144, China
2. Department of Road and Bridge Engineering, Hebei Jiaotong Vocational and Technical College, Shijiazhuang 050091, China
3. Hebei Provincial Seasonal Frozen Area Highway Service Safety and Early Warning Technology Innovation Center, Shijiazhuang 050091, China
4. College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China |
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Abstract To accurately reflect the temperature jump phenomenon at the surrounding rock-lining interface, a new calculation method for thermal contact resistance was proposed. Based on the disc-model thermal contact resistance calculation, a rock thermal impedance evaluation coefficient was introduced as a function of the rock-mass basic quality index for different surrounding rocks. The accuracy of the proposed method was verified through numerical simulations and laboratory experiments. When the temperature was increased from 20 ℃ to 80 ℃, the interfacial thermal contact resistance between rock and concrete specimens decreased. As the surrounding rock grade declined and its quality deteriorated, the rock-mass basic quality index decreased. A higher thermal impedance evaluation coefficient resulted in a more pronounced increase in interfacial thermal contact resistance, with a maximum increase of 111.24%. The maximum relative error between the interfacial thermal contact resistance calculated using the proposed method and the theoretical results was 12.52%. Experimental results show that the proposed method takes into account the lithological factors of the surrounding rock. Compared with traditional methods, the proposed method features convenient parameter acquisition and strong engineering applicability.
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Received: 27 September 2024
Published: 27 October 2025
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| Fund: 国家自然科学基金资助项目（52178378）. |
考虑围岩岩性影响的高岩温隧道围岩-衬砌界面接触热阻计算方法
为了准确反映围岩-衬砌界面的温度跃变现象，基于圆盘模型下的界面接触热阻计算公式，根据不同围岩的岩体基本质量指标引入岩石热阻抗评价系数，提出新的界面接触热阻计算方法. 通过数值模拟和室内实验验证所提方法的准确性. 当温度由20 ℃升至80 ℃时，岩石与混凝土试件的界面接触热阻呈减小趋势. 围岩等级和质量越低，岩体基本质量指标越小；热阻抗评价系数越高，界面接触热阻增大越明显，最大增幅为111.24%. 采用所提方法计算的界面接触热阻与理论结果的最大相对误差为12.52%. 实验结果表明，所提方法考虑了围岩岩性因素，相比传统方法，具有获得参数便捷、工程适用性强的特点.
关键词：
隧道工程,
高岩温,
围岩-衬砌,
界面接触热阻,
计算方法,
室内实验
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