| 单轴压缩条件下岩石声发射特性的实验研究 |
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| 引用本文： | 陈宇龙,魏作安,许江,唐晓军,杨红伟,李树春.单轴压缩条件下岩石声发射特性的实验研究[J].煤炭学报,2011,36(Z2):237-240. |
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| 作者姓名： | 陈宇龙 魏作安 许江 唐晓军 杨红伟 李树春 |
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| 作者单位： | 1.煤矿灾害动力学与控制国家重点实验室（重庆大学），重庆 400030；;
2.重庆大学 资源及环境科学学院,重庆 400030 |
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| 基金项目： | 国家自然科学基金资助项目(10772205); 重庆大学大学生创新基金资助项目 |
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| 摘 要： | 利用MTS岩石力学试验系统和PAC声发射信号采集系统，研究了砂岩在单轴压缩条件下应力-应变全过程的声发射特征以及加载速率对其的影响。获得了岩石轴向应力与轴向应变、横向应变、体应变之间的关系曲线，以及全应力-纵向应变过程曲线中4个阶段的声发射特征；在初始压密和弹性阶段，声发射撞击数少、能量低、振幅小、无事件数产生；在应变硬化阶段，撞击数骤增、能量高、振幅大、有大量事件数产生；在应变软化阶段撞击数骤减、能量低、振幅小、有事件产生。由于岩石每个变形阶段具有不同的声发射特征，因此，可用声发射来表征岩石的微观损伤演化和预测现场工程岩体的宏观断裂失稳过程。另外，随着加载速率的提高，岩石裂纹扩展速率会加快，损伤加大，从而产生更多的声发射；但峰值处释放能量的最大值呈递减趋势，产生强烈声发射的应变值变小。
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| 关 键 词： | 声发射 单轴压缩 加载速率 砂岩 |
| 收稿时间： | 2011-05-12 |
Experimental research on the acoustic emission characteristics of rock under uniaxial compression |
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| CHEN Yu-long,WEI Zuo-an,XU Jiang,TANG Xiao-jun,YANG Hong-wei,LI Shu-chun,Chongqing ,China,.College of Resource , Environmental Sciences,Chongqing University,.State , Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam.Experimental research on the acoustic emission characteristics of rock under uniaxial compression[J].Journal of China Coal Society,2011,36(Z2):237-240. |
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| Authors: | CHEN Yu-long WEI Zuo-an XU Jiang TANG Xiao-jun YANG Hong-wei LI Shu-chun Chongqing China College of Resource Environmental Sciences Chongqing University State Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam |
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| Affiliation: | CHEN Yu-long1,2,WEI Zuo-an1,3,XU Jiang1,TANG Xiao-jun4,YANG Hong-wei1,LI Shu-chun1(1.State Key Laboratory for Coal Mine Disaster Dynamics and Control(Chongqing University),Chongqing 400030,China,2.College of Resource and Environmental Sciences,Chongqing University,3.State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam(Chongqing University),4.Department of Building Engineering,Chongqing Industry Polytechnic College,Cho... |
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| Abstract: | All characteristics of acoustic emission in the procedure of rock stress-strain and effect of loading rates were studied experimentally under uniaxial compression by using PAC acoustic emission acquisition system and MTS equipment.The relationship of axial stress with axial strain,transverse strain and volume strain of rock,as well as the characteristics of acoustic emission at four stages of the stress-strain curve were obtained.In initial consolidation and elastic phase,it is found out that hits seldom ha... |
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| Keywords: | acoustic emission(AE) uniaxial compression loading rate sandstone |
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