石灰岩热冲击破裂二维分形参数演化规律研究

doi:10.13722/j.cnki.jrme.2021.0791

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摘要为探究石灰岩热冲击破裂二维分形参数演化规律，应用高分辨X射线三维CT检测系统对经过不同温度热冲击试验处理的标准石灰岩试件进行观测，结合图像处理软件统计并计算石灰岩二维分形参数，对石灰岩热冲击破裂后的二维分形参数演化规律进行研究。结果表明：高温石灰岩在20 ℃水中热冲击冷却时，随着温度由 200 ℃升至600 ℃，二维分形维数D单调递增，且D在200 ℃～400 ℃上升幅度小于400 ℃～600 ℃阶段。对于裂隙强随机分布的石灰岩，引入裂隙发育指数K，并得到在 20 ℃水中热冲击下K关于石灰岩温度T的拟合关系式；400 ℃石灰岩在不同温度水中热冲击破裂，随着水温由20 ℃升至100 ℃，任意方向的二维分形维数逐渐减小，且具有方向差异性；400 ℃石灰岩在不同温度水中热冲击破裂，裂隙面三维分形容量维数与二维分形维数演变规律一致，且两者具有高度拟合的线性关系。研究结果可以丰富和发展高温岩石力学理论。

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	董赟盛1
	郤保平1
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	何水鑫1
	辛国旭1
	杨欣欣1

关键词 ：岩石力学, 石灰岩, 热冲击破裂, 分形规律, 显微CT

Abstract：In order to explore the evolution law of two-dimensional fractal parameters of limestone thermal shock fracture，the high-resolution X-ray three-dimensional CT detection system was used to observe the standard limestone specimens treated by thermal shock tests at different temperatures，and the two-dimensional fractal parameters of limestone were counted and calculated with image processing software. To study the evolution law of two-dimensional fractal parameters after thermal shock fracture of limestone. The results show that when the high-temperature limestone is cooled by thermal shock in 20 ℃ water，as the temperature increases from 200 ℃ to 600 ℃，the two-dimensional fractal dimension D increases monotonically，and the increase range of D is less than 400 ℃–600 ℃ at 200 ℃–400 ℃ stage. For limestone with strong random distribution of fissures，the fissure development index K is introduced，and the fitting relationship between K and limestone temperature T under thermal shock in 20 ℃ water is obtained. The thermal shock fracture of limestone at 400 ℃ in water at different temperatures，as the water temperature increases from 20 ℃ to 100 ℃，the two-dimensional fractal dimension in any direction gradually decreases，and there are directional differences. The thermal shock fracture of 400 ℃ limestone in water at different temperatures shows that the three-dimensional fractal volume dimension of the fracture surface is consistent with the two-dimensional fractal dimension，and they have a highly fitted linear relationship. The study results can enrich and develop the theory of high temperature rock mechanics.

Key words： soil mechanica limestone thermal shock cracking fractal law micro-CT

引用本文:

董赟盛1，郤保平1，2，何水鑫1，辛国旭1，杨欣欣1. 石灰岩热冲击破裂二维分形参数演化规律研究[J]. 岩石力学与工程学报, 2022, 41(S1): 2823-2833.
DONG Yunsheng1，XI Baoping1，2，HE Shuixin1，XIN Guoxu1，YANG Xinxin1. Study on evolution law of two-dimensional fractal parameters of thermal shock fracture of limestone. , 2022, 41(S1): 2823-2833.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0791 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/2823

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