| Numerical experimental study on failure process of sandstone containing natural damage under freeze-thaw cycle北大核心CSCD |
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| 引用本文： | 刘慧,徐雅丽,杨更社,潘鹏志,金龙,唐丽云,黄慧琦.Numerical experimental study on failure process of sandstone containing natural damage under freeze-thaw cycle北大核心CSCD[J].冰川冻土,2022,44(6):1875-1886. |
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| 作者姓名： | 刘慧 徐雅丽 杨更社 潘鹏志 金龙 唐丽云 黄慧琦 |
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| 作者单位： | 1.西安科技大学 建筑与土木工程学院，陕西 西安 710054;2.中国科学院 武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071;3.中交第一公路勘察设计研究院，陕西 西安 710075 |
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| 基金项目： | 国家自然科学基金项目(42277172);陕西省自然科学基础研究计划项目(2020JZ-53) |
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| 摘 要： | Natural damage such as fissures and pores make the rock microstructure show strong heterogeneity，which influences the failure process and mode. In this paper，the numerical test of freeze-thaw sandstone splitting failure with natural damage was carried out based on CT non-destructive identification technology，combined with digital image processing technology and CASRock numerical simulation software. The analysis of splitting failure mode，deformation localization and crack evolution process of freeze-thaw sandstone with natural damage reveals the failure mechanism of sandstone with natural damage under freeze-thaw and load. The results show that the expansion of primary pores（cracks）and the formation of new pores in sandstone are the main forms of freeze-thaw rock failure evolution. The failure of rock containing natural damage under freeze-thaw and load is related to the degree and distribution of natural damage. The generation of secondary cracks mostly occurs in natural damage-intensive areas. During the loading process，the stress in the localized damage zone is far greater than sandstone’s overall stress，and rock’s failure in the localized damage zone is synchronized with the energy release and stress release in the region. Localized damage reflects the evolution of cracks in rocks and helps to predict the direction of sandstone crack development. The failure mode of rock is related to the number of freeze-thaw cycles. The freeze-thaw cycles make the sandstone with natural damage gradually change from brittle failure to ductile failure，and the change of the overall strength of the rock is a gradual deterioration process. © 2022 Science Press (China).
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| 关 键 词： | 冻融岩石 CASRock CT扫描 图像处理 破坏过程 局部化损伤 |
| 收稿时间： | 2022-04-24 |
| 修稿时间： | 2022-09-14 |
Numerical experimental study on failure process of sandstone containing natural damage under freeze-thaw cycle |
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| Hui LIU,Yali XU,Gengshe YANG,Pengzhi PAN,Long JIN,Liyun TANG,Huiqi HUANG.Numerical experimental study on failure process of sandstone containing natural damage under freeze-thaw cycle[J].Journal of Glaciology and Geocryology,2022,44(6):1875-1886. |
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| Authors: | Hui LIU Yali XU Gengshe YANG Pengzhi PAN Long JIN Liyun TANG Huiqi HUANG |
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| Institution: | 1.College of Architecture and Civil Engineerin，Xi’an University of Science and Technology，Xi’an 710054，China;2.State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan 430071，China;3.CCCC First Highway Consultants Co. LTD，Xi’an 710075，China |
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| Abstract: | Natural damage such as fissures and pores make the rock microstructure show strong heterogeneity， which influences the failure process and mode. In this paper， the numerical test of freeze-thaw sandstone splitting failure with natural damage was carried out based on CT non-destructive identification technology， combined with digital image processing technology and CASRock numerical simulation software. The analysis of splitting failure mode， deformation localization and crack evolution process of freeze-thaw sandstone with natural damage reveals the failure mechanism of sandstone with natural damage under freeze-thaw and load. The results show that the expansion of primary pores （cracks） and the formation of new pores in sandstone are the main forms of freeze-thaw rock failure evolution. The failure of rock containing natural damage under freeze-thaw and load is related to the degree and distribution of natural damage. The generation of secondary cracks mostly occurs in natural damage-intensive areas. During the loading process， the stress in the localized damage zone is far greater than sandstone’s overall stress， and rock’s failure in the localized damage zone is synchronized with the energy release and stress release in the region. Localized damage reflects the evolution of cracks in rocks and helps to predict the direction of sandstone crack development. The failure mode of rock is related to the number of freeze-thaw cycles. The freeze-thaw cycles make the sandstone with natural damage gradually change from brittle failure to ductile failure， and the change of the overall strength of the rock is a gradual deterioration process. |
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| Keywords: | freeze-thaw rock CASRock CT scan image processing destruction process localized damage |
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