冻融裂隙砂岩细观损伤与应变局部化研究

doi:10.13722/j.cnki.jrme.2022.0126

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摘要寒区循环冻融作用致使岩石损伤劣化，进而影响局部应变发展及其受载破坏特征。为在不同冻融方式下评估完整/裂隙岩石的细观损伤、应变集中及破坏模式，预制断续节理砂岩，开展饱水完整试件、饱水裂隙试件、饱冰裂隙试件的循环冻融及单轴压缩试验研究。通过CT技术获取不同冻融次数与应力状态下的细观图像，分析损伤演化特征，而后结合数字体相关法量化三维应变分布，实现冻融岩石细观特征与宏观破坏的内在关联探讨。研究结果表明：(1) 完整岩石与裂隙岩石的损伤劣化分别主要发生在试件外围及低倾角预制裂隙附近；随着循环次数增加，饱水冻融岩石的异质系数与裂隙占比逐渐增大，而饱冰冻融岩石则相对稳定。(2) 岩石内部的等效应变与正应变，，的统计频率分别呈对数正态分布和正态分布。但完整岩石与裂隙岩石的局部应变特征不一，前者受载后形成一条75°的剪切带；后者于低倾角预制裂隙及岩桥区域发生应变集中，且的极差与标准差约为的2倍。(3) 冻融损伤直接影响完整岩石的应变集中，进而引导次级裂隙发展；但对裂隙岩石只可作为翼裂纹发展的诱因，其破坏模式由预制裂隙排布决定。本文结论可为探索岩体冻融损伤机制及破坏预测方法提供参考。

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	谭皓
	宋勇军
	郭玺玺
	孟凡栋
	韩冬阳
	孙银伟

关键词 ：岩石力学, CT扫描, 冻融循环, 裂隙砂岩, 细观损伤, 数字体相关

Abstract：In cold regions，cyclic freezing and thawing leads to rock damage and deterioration，which in turn affects the development of local strain and its loading failure characteristics. In order to evaluate the meso-damage，strain concentration and failure modes of intact/fractured rocks under different freeze-thaw(F-T) types，discontinuous jointed sandstones were prefabricated. Then the cyclic F-T and uniaxial compression tests of saturated intact，saturated fractured and ice-filled fractured specimens were carried out. The meso-images under different F-T cycles and stress states were obtained by CT technology，and the damage evolution characteristics were analyzed. Then，combined with the digital volume correlation method to quantify the three-dimensional strain distribution，the intrinsic relationship between the mesoscopic and macroscopic damage of frozen-thawed rocks was realized. The results show that：(1) The deterioration of intact rock and fractured rock mainly occurs in the periphery of the specimen and near the prefabricated fracture with low dip angle. With the increase of F-T cycle times，the heterogeneity coefficient and fracture ratio of saturated F-T rocks gradually increase，while the ice-filled F-T rock is relatively stable. (2) The statistical frequencies of von Mises equivalent strain( ) and normal strain( ，， ) in rocks show lognormal distribution and normal distribution respectively. However，the local strain distribution of intact rock and fractured rock are different. The former forms a 75°shear band after loading，while the latter occurs strain concentration at the low dip prefabricated fracture and rock bridge area，and the range and standard deviation of are about twice that of . (3) F-T damage directly affects the strain concentration area of intact rock，and then guides the development of secondary fractures. But for fractured rocks，it can only be used as the inducement of wing crack development，and its failure mode is determined by the arrangement of prefabricated fractures. The conclusion of this paper can provide reference for exploring the mechanism of F-T damage and the method of failure prediction.

Key words： rock mechanics CT scanning freeze-thaw cycles fractured sandstone mesoscopic damage digital volume correlation

引用本文:

谭皓，宋勇军，郭玺玺，孟凡栋，韩冬阳，孙银伟. 冻融裂隙砂岩细观损伤与应变局部化研究[J]. 岩石力学与工程学报, 2022, 41(12): 2485-2496.
TAN Hao，SONG Yongjun，GUO Xixi，MENG Fandong，HAN Dongyang，SUN Yinwei. Research on meso-damage and strain localization of fractured sandstone after freeze-thaw cycles. , 2022, 41(12): 2485-2496.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0126 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I12/2485

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