| 循环加卸载下花岗岩非均匀变形演化的声发射特征试验研究 |
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| 引用本文： | 杨小彬,韩心星,刘恩来,张子鹏,王逍遥.循环加卸载下花岗岩非均匀变形演化的声发射特征试验研究[J].岩土力学,2018,39(8):2732-2739. |
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| 作者姓名： | 杨小彬 韩心星 刘恩来 张子鹏 王逍遥 |
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| 作者单位： | 1. 中国矿业大学（北京） 资源与安全工程学院，北京 100083； 2. 中国矿业大学（北京） 共伴生能源精准开采北京市重点实验室，北京 100083 |
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| 基金项目： | 国家自然科学基金（No.51274207，No.50904071） |
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| 摘 要： | 为了研究岩石材料在循环加卸载过程中的声发射特征与非均匀变形的对应关系，开展了花岗岩试件单轴循环加卸载试验。利用声发射系统和CCD相机分别对试样变形破坏过程中的声发射信号和试件表面的变形图像进行采集，结合数字散斑相关方法，对试件非均匀变形演化过程中的声发射特性进行研究。研究结果发现：每次循环加载过程中，非均匀变形的最小点皆与应力卸载的最低点相对应。而自局部化带启动后，每次循环加载过程中的非均匀变形的最大点滞后于循环加载应力的顶点。非均匀变形演化与声发射信号存在较好的对应关系，循环加载过程中非均匀变形的首次转折增大点对应声发射信号增加的起点，非均匀变形的最大点对应声发射信号平静期的起点。随循环次数增加，非均匀变形程度与Felicity比呈负相关关系，即非均匀变形越大，损伤程度越大，Felicity比越小。
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| 关 键 词： | 循环加卸载 非均匀变形 声发射信号 局部化带 Felicity比 |
| 收稿时间： | 2018-01-09 |
Experimental study on the acoustic emission characteristics of non-uniform deformation evolution of granite under cyclic loading and unloading test |
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| YANG Xiao-bin,HAN Xin-xing,LIU En-lai,ZHANG Zi-peng,WANG Xiao-yao.Experimental study on the acoustic emission characteristics of non-uniform deformation evolution of granite under cyclic loading and unloading test[J].Rock and Soil Mechanics,2018,39(8):2732-2739. |
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| Authors: | YANG Xiao-bin HAN Xin-xing LIU En-lai ZHANG Zi-peng WANG Xiao-yao |
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| Institution: | 1. School of Resource and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; 2. Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing 100083, China |
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| Abstract: | In this study, uniaxial cyclic loading tests were carried out on granite specimens to study the relationship between acoustic emission (AE) characteristics and non-uniform deformation of rock materials during the cyclic loading process. The AE signals and the deformation images of the specimen surfaces were collected by using the AE system and CCD camera in the deformation and failure process, respectively. Combined with the digital speckle correlation method, the AE characteristics of specimens were investigated during the evolution process of non-uniform deformation. The research results showed that the minimum point of non-uniform deformation corresponded to the lowest point of unloading stress during each cyclic loading process. However, after the startup of the localisation band, the maximum point of non-uniform deformation lagged behind the vertex of loading stress in each cyclic loading process. There was a good correspondence between the non-uniform deformation evolution and the AE signal. During the cyclic loading process, the first turning and increasing point of non-uniform deformation is the starting point of the increase of AE signal, whereas the maximum point of non-uniform deformation is the starting point of the quiet period of the AE signal. With the increase of cyclic number, the degree of non-uniform deformation is negatively correlated with the Felicity ratio, that is, the greater the non-uniform deformation is, the greater the damage degree is, and the smaller the Felicity ratio is. |
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| Keywords: | cyclic loading and unloading non-uniform deformation acoustic emission signal localisation band Felicity ratio |
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