冻融循环过程中岩石热传导规律试验及理论分析

doi:10.13722/j.cnki.jrme.2016.0861

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摘要为研究岩石在低温环境下内部温度场随冻结、融化过程变化特征，探讨岩石在冻融循环过程中整体热传导规律。现开展干燥、饱水状态下类砂岩试样冻融循环室内试验，分析类砂岩试样在冻结、融化过程中内部非等温传递规律；结合试验现象，从水冰微观结构探讨水冰相变过程产生的热传导弛豫机制；最后，基于热传导理论，详细探讨冻融循环干燥、饱水状态下岩石热传导方程，给出饱水岩石三阶段温度分布理论解，并通过与试验对比，验证理论分析的合理性。研究结果表明：(1) 冻融循环过程中干燥状态下的类砂岩试样，其温变曲线大体呈现负指数曲线特征，且越靠近边界面，温变速率越大，同时相对冻结过程，融化升温过程速率更快；(2) 冻融循环过程中饱水状态下的类砂岩试样，其温变曲线呈现明显的三区段过程，在水冰相变过程产生典型的缓温变段，且相对干燥状态，其温变速率均出现一定程度降低；(3) 利用水分子相变过程中微观结构变化，可较好地解释水冰相变过程造成的热传导弛豫现象；(4) 给出了干燥、饱水状态下岩石热传导方程，并借此探讨了饱水状态下固相、液相及相变区温度理论解，通过与室内试验对比，验证了理论分析公式的合理性。研究对认识冻融环境下岩石内部温度场演化规律具有一定参考价值。

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	申艳军1
	杨更社1
	王铭1
	张慧梅1
	贾海梁1
	荣腾龙2

关键词 ：岩石力学, 冻融循环, 类砂岩试样, 水冰相变, 热弛豫机制, 热传导方程

Abstract：Quasi-sandstone samples in dry and water-saturated states were tested in laboratory to analyze the non-isothermal heat transfer of rocks. The process of phase changes of water to ice leading to the reduction of heat conduction was investigated based on the experimental results. The equations of heat conduction in rock considering the effect of the cyclic freezing and thawing were proposed. The expressions describing the three-step change of temperature for the water-saturated rocks were also put forward and verified with the experiment results. The temperature variation curve of the dry quasi-sandstone samples under cyclic freezing and thawing changes negative exponentially. The rate of temperature change closer to the boundary surface is greater. The rate of temperature change in thawing period is greater than in freezing process. The temperature variation curves of saturated quasi-sandstone samples show three distinctive stages. The temperature changes slower during the process of phase change of water-ice. The rates of the temperature change of the saturated samples appear a bit lower than the dry ones. The structural transformation of water molecules during the process of phase change can be used to explain the phenomenon of reduction of thermal conductivity.

Key words： rock mechanics freeze-thaw cycles quasi-sandstone sample water-ice phase thermal conductivity relaxation thermal conductivity equation

引用本文:

申艳军1，杨更社1，王铭1，张慧梅1，贾海梁1，荣腾龙2. 冻融循环过程中岩石热传导规律试验及理论分析[J]. 岩石力学与工程学报, 2016, 35(12): 2417-2425.
SHEN Yanjun1，YANG Gengshe1，WANG Ming1，ZHANG Huimei1，JIA Hailiang1，RONG Tenglong2. Experimental and theoretical study on thermal conductivity of rock under cyclic freezing and thawing. , 2016, 35(12): 2417-2425.

链接本文:

http://rockmech.org/CN/10.13722/j.cnki.jrme.2016.0861 或 http://rockmech.org/CN/Y2016/V35/I12/2417

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