| 盐岩三轴压缩破坏与声波声发射特征试验研究 |
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| 引用本文： | 李浩然,杨春和,赵维刚,刘 博,尹雪英.盐岩三轴压缩破坏与声波声发射特征试验研究[J].岩土力学,2016,37(9):2458-2466. |
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| 作者姓名： | 李浩然 杨春和 赵维刚 刘 博 尹雪英 |
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| 作者单位： | 1. 石家庄铁道大学 大型结构健康诊断与控制研究所，河北 石家庄 050043； 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. 国家知识产权局专利局 材料工程发明审查部，北京 100088 |
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| 基金项目： | 国家自然科学基金资助项目（No.41272391）；国家自然科学青年基金资助项目（No.51304187）。 |
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| 摘 要： | 利用岩石声波-声发射一体化测试系统与应力加载装置，系统地研究了三轴压缩试验中盐岩的变形破坏特征与声波声发射活动规律。结果表明：（1）三轴加载试验中，盐岩的破坏过程分为压密与弹性压缩阶段、裂纹产生与稳定增长阶段、裂纹加速增长阶段和应变硬化阶段。阶段Ⅰ中，盐岩纵横波波速略微上升，并伴随少量的声发射事件；阶段Ⅱ中，盐岩的声发射活动开始活跃，超声波波速稳定；阶段Ⅲ和阶段Ⅳ中，岩石的声发射事件数量大幅度上升，纵波波速保持稳定，横波波速呈现明显地下降趋势。（2）盐岩的声波与声发射特征与试验围压应力密切相关。围压水平越低，受载盐岩破坏过程中的波速变化率越大；围压水平越高，盐岩超声波波速变化率越小。根据对试验数据的分析，当盐岩轴向应变达到10%，围压条件为5、10、15、20 MPa时盐岩的声发射事件数量分别为16 271、8 764、3 041、906个，围压对盐岩破坏过程的声发射活动有较大的影响，显示了围压致密效应。
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| 关 键 词： | 超声波波速 声发射 三轴压缩试验 围压 岩体损伤 |
| 收稿时间： | 2015-04-15 |
Experimental studies of failure characteristics and evolution laws of ultrasonic velocity and acoustic emission for salt rock under triaxial loading |
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| LI Hao-ran,YANG Chun-he,ZHAO Wei-gang,LIU Bo,YIN Xue-ying.Experimental studies of failure characteristics and evolution laws of ultrasonic velocity and acoustic emission for salt rock under triaxial loading[J].Rock and Soil Mechanics,2016,37(9):2458-2466. |
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| Authors: | LI Hao-ran YANG Chun-he ZHAO Wei-gang LIU Bo YIN Xue-ying |
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| Institution: | 1. Structural Health Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 3. Material Engineering Examination Department, Patent Office, State Intellectual Property Office of the P.R.C, Beijing 100088, China |
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| Abstract: | In order to investigate the characteristics of ultrasonic wave velocity and acoustic emission activity of salt rock under triaxial loading, the triaxial loading tests are conducted. Employing a device composed of acoustic wave testing system, acoustic emission testing systems, we obtain the following results: Four stages are identified in the process, including stageⅠof the elastic compression, stageⅡof initiation and stabilized growth of fractures, stage Ⅲ of accelerated growth of fractures, stage Ⅳ of sustained strength. During phaseⅠ, the velocity of ultrasonic wave of salt rock has a slight increase，and a few acoustic emission(AE) events happen in this stage. In the stageⅡ, P-wave and S-wave remain stable, AE events become active. In phase Ⅲ and Ⅳ, AE activity of salt rock performs intensely, and the velocity of P-wave remains stable while velocity of S-wave reduces significantly. The level of confining pressure significantly influence ultrasonic wave velocity and acoustic emission activity. The rate of change of velocity of ultrasonic wave is large at a low level of confining pressure while small at a high level of confining pressure. When dynamic axial strain is 10%, the total amount of AE events is 16 271 under confining pressure of 5 MPa, the number decreases to 8 764 under confining pressure of 10 MPa due to the effect of compaction, 3 041 under confining pressure of 15 MPa, and 906 under confining pressure of 20 MPa, which indicates that the level of confining pressure greatly influenc the AE activity, showing “the effect of confining pressure densification”. |
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| Keywords: | ultrasonic velocity acoustic emission triaxial loading test confining pressure rock damage |
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