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未冻水含量是影响岩石低温冻结过程中热力学性质的重要因素,是冻土科学研究中的重要问题.采用CT无损识别技术进行不同温度梯度下岩石CT扫描实验,获得了20℃、-2℃、-5℃、-10℃、-20℃、-30℃下岩石的CT扫描图像.以数字图像处理理论为依据,运用CT图像直方图技术进行不同温度梯度下冻结岩石CT图像解析,完成了冻结岩石未冻水含量及损伤信息的定量分析.研究结果表明:-2~-5℃是岩石内未冻水含量急剧减小的温度区间;当温度降到-10℃时,岩石内未冻水全部冻结成冰.根据CT数直方图峰形形状可判别低温环境下冻结岩石的损伤大小及分布均匀性.论文所提出的冻结岩石CT图像直方图技术为定量分析不同温度梯度下冻结岩石未冻水含量、损伤扩展随温度的变化规律提供了新的方法和思路.
The unfrozen water content is an important factor that affects the thermodynamic properties during rock freezing and is an important issue in the research of frozen soil science.Using CT non-destructive identification technique to conduct CT scanning experiments under different temperature gradients, , -5 ° C, -10 ° C, -20 ° C and -30 ° C, respectively.According to the theory of digital image processing, the CT image histogram was used to analyze the frozen rock CT images under different temperature gradients The results show that: -2 ~ -5 ℃ is the temperature range in which the content of unheated water in the rock decreases sharply; when the temperature drops to -10 ℃, the rock is not frozen The water is all frozen into ice.According to the peak shape of CT histogram, the damage size and distribution uniformity of frozen rock under low temperature can be distinguished.The technique of frozen rock CT image histogram proposed in this paper is used to quantitatively analyze the frozen rock under different temperature gradients Frozen water content, damage spread with the temperature changes in the law provides a new method and train of thought.