Experimental study on meso-structure of rock in the process of crack(pore) water freezing
LIU Hui1，YANG Gengshe1，JIA Hailiang1，YE Wanjun1，WEI Yao1，XI Jiami1，SHEN Yanjun1，ZHANG Huimei2
(1. Institute of Architecture and Civil Engineering，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China；
2. Department of Mechanics，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China)
Abstract：Studying the change of meso-structure of rock during freezing has great significance for deepening the understanding of the mechanical and damage characteristics of frozen rock. The CT images of the meso-structure of rock at different freezing temperature gradients were obtained. The edge of CT images of frozen rock was detected using the Canny operator and two-dimentional meso-structure of rock during freezing was identificated. The composition and relationship of the meso-structure for frozen rock were analyzed based on the theory of stereo vision. The formula for calculating the characteristic parameters of meso-structure of frozen rock were presented. The variation of lengths，widths，areas and roundness for the pores and cracks were analyzed quantitatively during the process of freezing. The length，width and area of cracks (pores) were found to be rapidly increased in the temperature range of 0 ℃ to －2 ℃ due to the volume expansion of freezing water in the macroscopic cracks. The expansion rate of cracks (pores) was significantly reduced in the temperature range of －2 ℃ to －5 ℃. In this stage, It is deduced that the freezing process of the water in the meso-cracks (pores) (or partly micro) occurred. The expansion of the cracks (pores) increased again in the temperature range of －5 ℃ to －20 ℃，but with a lower rate than in temperature range of 0 ℃ to －2 ℃. In this stage the water in the micro cracks(pores) was transformed into the ice crystals.
刘 慧1，杨更社1，贾海梁1，叶万军1，魏 尧1，奚家米1，申艳军1，张慧梅2. 裂隙(孔隙)水冻结过程中岩石细观结构变化的实验研究[J]. 岩石力学与工程学报, 2016, 35(12): 2516-2524.
LIU Hui1，YANG Gengshe1，JIA Hailiang1，YE Wanjun1，WEI Yao1，XI Jiami1，SHEN Yanjun1，ZHANG Huimei2. Experimental study on meso-structure of rock in the process of crack(pore) water freezing. , 2016, 35(12): 2516-2524.
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2016, Vol. 35 
