Damage evolution characteristics of fractured rock under freeze-thaw cycles

doi:10.3969/j.issn.1000-1565.2024.06.003

Abstract

Abstract: In order to analyze the influence of freeze-thaw cycle on the characteristics of rock fissure development in detail, CT scanning technology was used to obtain three-dimensional structural images of intact sandstone and fissured sandstone samples, and quantitatively describe the model parameters of the pore network, aiming to systematically analyze the dynamic evolution of the fissure morphology of the rock during the freeze-thaw cycle and the change rule of the pore structure along with the increase of the number of freeze-thaw cycles. The results show that during the freeze-thaw cycle, the fine structural parameters of sandstone samples show positive correlation with the number of freeze-thaw cycles; intact sandstone is more resistant to freeze-thaw damage, and mainly forms a ring-shaped damage zone at the periphery of the rock; the fractal dimension of fractured sandstone is significantly higher than that of intact sandstone, and the change of pore size distribution is more significant, and due to the existence of preformed - DOI:10.3969/j.issn.1000-1565.2024.06.003冻融循环作用下裂隙岩石损伤扩展演化特征吕远强^1,2,叶万军³,赵金刚¹,姜海波¹,蒋蓓茹³,张雪丽³(1.中煤西安设计工程有限责任公司,陕西西安 710000;2.长安大学地质工程与测绘学院,陕西西安 710054;3.西安科技大学建筑与土木工程学院,陕西西安 710054)摘要:为深入剖析冻融循环对岩石裂隙发育特性的影响,运用CT扫描技术获取完整砂岩与裂隙砂岩样本的三维结构影像,对孔隙网络的模型参数实施量化描述,旨在系统分析岩石在经历冻融循环过程中的裂隙形态动态演变,以及伴随冻融循环次数增加的孔隙结构变化规律.结果表明:冻融循环过程中,砂岩样本细观结构参数表现出与冻融循环次数之间的正相关性;完整砂岩对冻融损伤的抵抗力较强,主要在岩石外围形成环状损伤区;裂隙砂岩的分形维数显著高于完整砂岩,孔径分布变化更为显著,由于存在预制裂隙,裂隙成为冻融损伤的集中区;孔隙总体积和面孔隙率的增加是冻融损伤的直接结果.研究结果对于揭示寒冷地区岩体损伤机制具有一定参考价值.关键词:CT扫描;裂隙砂岩;冻融循环;孔隙网络模型;孔隙率中图分类号:TU45 文献标志码:A 文章编号:1000-1565(2024)06-0581-12Damage evolution characteristics of fractured rock under freeze-thaw cyclesLYU Yuanqiang^1,2, YE Wanjun³, ZHAO Jingang¹, JIANG Haibo¹, JIANG Beiru³, ZHANG Xueli³(1. China Coal Xian Design Engineering Co., Ltd., Xian 710000, China; 2. College of Geological Engineering and Geomatics, Changan University, Xian 710054,China; 3. School of Architecture and Civil Engineering, Xian University of Science and Technology, Xian 710054, China)Abstract: In order to analyze the influence of freeze-thaw cycle on the characteristics of rock fissure development in detail, CT scanning technology was used to obtain three-dimensional structural images of intact sandstone and fissured sandstone samples, and quantitatively describe the model parameters of the pore network, aiming to systematically analyze the dynamic evolution of the fissure morphology of the rock during the freeze-thaw cycle and the change rule of the pore structure along with the increase of the number of freeze-thaw cycles. The results show that during the freeze-thaw cycle, the fine structural parameters of sandstone samples show positive correlation with the number of freeze-thaw cycles; intact sandstone is more resistant to freeze-thaw damage, and mainly forms a ring-shaped damage zone at the periphery of the rock; the fractal dimension of fractured sandstone is significantly higher than that of intact sandstone, and the change of pore size distribution is more significant, and due to the existence of preformed - 收稿日期:2024-08-10;修回日期:2024-08-24 基金项目:国家自然科学基金资助项目(42220104005) 第一作者:吕远强(1977—),男,中煤西安设计工程有限责任公司高级工程师,长安大学在读博士研究生,主要从事岩土工程和工程地质方面的研究.E-mail:4109914@qq.com 通信作者:叶万军(1976—),男,西安科技大学教授,博士生导师,博士,主要从事岩土工程、隧道工程等方面的研究.E-mail:63451400@qq.com 第6期吕远强等:冻融循环作用下裂隙岩石损伤扩展演化特征河北大学学报(自然科学版) 第44卷fissures, there is a concentrated zone of freeze-thaw damage; and the increase of the total volume of the pore and the face porosity is a direct cause of freeze-thaw damage. The results of this study have certain reference value for revealing the damage mechanism of rock bodies in cold regions.

Key words: CT scan, fractured sandstone, freeze-thaw cycle, pore grid model, porosity

CLC Number:

TU45

LYU Yuanqiang, YE Wanjun, ZHAO Jingang, JIANG Haibo, JIANG Beiru, ZHANG Xueli. Damage evolution characteristics of fractured rock under freeze-thaw cycles[J]. Journal of Hebei University(Natural Science Edition), 2024, 44(6): 581-592.

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