干湿循环作用下预制裂隙炭质页岩力学特性及强度准则研究

doi:10.13722/j.cnki.jrme.2021.0730

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摘要为研究干湿循环和裂隙倾角对炭质页岩力学特性的影响，利用MTS815岩石力学试验系统，对不同干湿循环次数(0，5，15和20次)的预制裂隙炭质页岩进行单轴压缩和三轴压缩试验。研究结果表明：炭质页岩的峰值强度、黏聚力及内摩擦角随干湿循环次数的增加逐渐减小，表现出明显的干湿劣化效应，劣化程度表现为：峰值强度＞黏聚力＞内摩擦角；随围压的增加，干湿循环后炭质页岩强度的劣化度逐渐减小，表明围压对干湿劣化效应具有抑制作用。炭质页岩的峰值强度、黏聚力及内摩擦角随裂隙倾角的增加先减小后增大，表现出明显的倾角效应，但其与干湿劣化效应相互抑制，即随干湿循环次数的增加，峰值强度、黏聚力和内摩擦角减小，其倾角效应减弱。通过在Drucker-Prager准则中引入2个力学参数(和)，建立一种考虑干湿循环和裂隙倾角的强度准则，该准则能够很好地描述炭质页岩强度的干湿劣化效应和及倾角效应。研究结果可为工程实践中炭质页岩强度预测及边坡稳定性分析提供参考依据。

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	刘新喜
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	成磊
	范子坚

关键词 ：岩石力学, 干湿循环, 预制裂隙, 炭质页岩, 力学特性, 强度准则

Abstract：In order to investigate the influence of drying-wetting cycles and the fissure angle on the mechanical properties of carbonaceous shale with pre-existing fissures，uniaxial and triaxial compression tests on carbonaceous shale with pre-existing fissures after drying-wetting cycles(0，5，15 and 20 times) were carried out. The results show that the peak strength，cohesion and internal friction angle of carbonaceous shale gradually decrease with increasing the number of drying-wetting cycles，which manifests an obvious drying-wetting deterioration effect. The degree of deterioration is as follows：peak strength＞cohesion＞internal friction angle. The strength deterioration degree of carbonaceous shale after drying-wetting cycles gradually decreases with increasing the confining pressure，which indicates that the confining pressure has an inhibitory effect on the drying-wetting deterioration effect. The peak strength，cohesion and internal friction angle of carbonaceous shale show a trend of decreasing first and then increasing with increasing the fissure angle，which manifests an obvious angle effect. However，the angle effect and drying-wetting deterioration effect are mutually inhibited. In other words，as the number of drying-wetting cycles increases，the peak strength，cohesion and internal friction angle will decrease and the angle effect will attenuate. By introducing two mechanical parameters(and ) into the Drucker-Prager criterion，a strength criterion was established considering the drying-wetting cycles and the fissure angle，which can well describe the drying-wetting deterioration effect and angle effect of the strength. The research results can provide a reference for the strength estimation of carbonaceous shale in engineering practice and the stability analysis of slopes.

Key words： rock mechanics drying-wetting cycles pre-existing fissure carbonaceous shale mechanical properties strength criterion

引用本文:

刘新喜，李玉，王玮玮，周炎明，成磊，范子坚. 干湿循环作用下预制裂隙炭质页岩力学特性及强度准则研究[J]. 岩石力学与工程学报, 2022, 41(2): 228-239.
LIU Xinxi，LI Yu，WANG Weiwei，ZHOU Yanming，CHENG Lei，FAN Zijian. Research on mechanical properties and strength criterion of carbonaceous shale with pre-existing fissures under drying-wetting cycles. , 2022, 41(2): 228-239.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0730 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I2/228

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