| 二叠系炭质页岩软弱夹层剪切蠕变特性研究 |
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| 引用本文： | 朱赛楠,殷跃平,李滨.二叠系炭质页岩软弱夹层剪切蠕变特性研究[J].岩土力学,2019,40(4):1377-1386. |
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| 作者姓名： | 朱赛楠 殷跃平 李滨 |
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| 作者单位： | 1. 中国地质调查局 中国地质环境监测院，北京 100081；2. 中国地质大学（北京）工程技术学院，北京 100083；
3. 中国地质科学院地质力学研究所，北京 100081 |
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| 基金项目： | 国家自然科学基金项目(No. 41472295)；中国地质调查局项目(No. 12120114079101，No. DD20179609，No. DD20190637) |
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| 摘 要： | 以西南灰岩山区二叠系炭质页岩软弱夹层为研究对象，开展了原生软岩、层间剪切带和滑带3个演化阶段的矿物组成成分、微结构和不同正应力水平的剪切蠕变力学特性分析。结果表明：软弱夹层在演化过程中，矿物组分发生改变，黏土矿物含量在原生软岩中小于5%，层间剪切带中在5%～10%之间，滑带中大于10%。微结构由致密变得疏松，颗粒间连接力减弱；软弱夹层的蠕变位移和蠕变速率随着剪应力增加而增大，呈非线性关系。在相同剪应力条件下，蠕变位移和蠕变速率的关系为：滑带>层间剪切带>原岩。长期剪切强度逐渐降低，黏聚力的降幅大于内摩擦角，对时间的敏感程度较高。为受软弱夹层控制的层状基岩滑坡的发育发展过程、失稳机制研究提供了重要借鉴意义。
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| 关 键 词： | 炭质页岩 软弱夹层 剪切蠕变 长期强度 非线性损伤蠕变模型 演化过程 |
| 收稿时间： | 2017-10-25 |
Shear creep behavior of soft interlayer in Permian carbonaceous shale |
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| ZHU Sai-nan,YIN Yue-ping,LI Bin.Shear creep behavior of soft interlayer in Permian carbonaceous shale[J].Rock and Soil Mechanics,2019,40(4):1377-1386. |
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| Authors: | ZHU Sai-nan YIN Yue-ping LI Bin |
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| Institution: | 1. China Institute of Geo-Environment Monitoring, China Geological Survey, Beijing 100081, China; 2. School of Engineering and Technology, China University of Geosciences, Beijing 100083, China; 3. Institute of Geo-Mechanics, Chinese Academy of Geological Sciences, Beijing 100081, China |
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| Abstract: | We focus on the weak intercalation of Permian carbonaceous shale and analyze mineral composition, microstructure, and shear creep characteristics of Permian carbonaceous shale under different levels of normal stress during three evolutionary stages: original soft rock, interlayer shear zone, and sliding zone. The analysis results indicate that during the evolutionary process of the weak intercalation stage, the mineral compositions and content of the shale changed, and the clay mineral content gradually increased from less than 5% in the original soft rock stage to 5%-10% in the interlayer shear zone stage, and finally to greater than 10% in the sliding zone stage. The microstructure changed from compact to loose, and the bonding force between the particles was weakened. The creep displacement and the rate increases non-linearly with increasing shear stress. Under identical shear stress, the relationship of the creep displacement and the rate was that the sliding zone was greater than the interlayer shear zone, and the interlayer shear zone was greater than the original soft rock. The long-term shear strength gradually decreased, the drop in cohesion was greater than the angle of internal friction, and the cohesion was more sensitive to time than the angle of internal friction. The conclusions of this paper provided an important reference for the study of the development and mechanism of layered rock landslides controlled by weak intercalations. |
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| Keywords: | carbonaceous shale weak intercalation shear creep long-term strength nonlinear damage creep model evolutionary process |
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