| 不同岩石破裂全过程的声发射序列分形特征试验研究 |
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| 引用本文： | 吴贤振,刘祥鑫,梁正召,游勋,余敏.不同岩石破裂全过程的声发射序列分形特征试验研究[J].岩土力学,2012,33(12):3561-3569. |
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| 作者姓名： | 吴贤振 刘祥鑫 梁正召 游勋 余敏 |
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| 作者单位： | 1.江西理工大学 资源与环境工程学院，江西 赣州 341000；2.河北联合大学 矿业工程学院，河北 唐山 063009； 3.大连理工大学 岩石破裂与失稳研究中心，辽宁 大连 116024；4.马钢集团设计研究院有限责任公司，安徽 马鞍山 243000 |
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| 基金项目： | 国家自然基金(No.51079017,No.50804006,No.51174071);教育部新世纪优秀人才计划(No.NECT-09-0258);全国优秀博士论文专项资助(No.200860) |
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| 摘 要： | 通过对不同岩性的岩石进行单轴压缩声发射试验，获取岩石破裂全过程中的载荷-轴向变形曲线及声发射参数，观察试件破裂失稳时的破坏情况，分析破坏过程的载荷变化关系。着重对比了不同岩石的不同力学性质、岩石声发射序列的时域特征和声发射序列的分形特征。研究结果表明，采用声发射率、能率可以很好地描述岩石破裂损伤的整个阶段；计算岩石声发射率、声发射能率的关联维数，可得出岩石破裂过程的声发射序列具有分形特征；岩石破裂过程的声发射分维值D反映了岩石内部微裂隙的统计演化规律；不同岩性的岩石破裂过程的声发射参数序列的分形特征具有一定的共性；归纳总结出岩体声发射序列分维曲线的演化模式，即波动→持续下降演化模式，提出可以将分维值的持续下降作为岩体破裂失稳的前兆。
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| 关 键 词： | 岩石力学 破裂失稳 声发射 分形 演化模式 |
| 收稿时间： | 2011-08-12 |
Experimental study of fractal dimension of AE serials of different rocks under uniaxial compression |
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| WU Xian-zhen,LIU Xiang-xin,LIANG Zheng-zhao,YOU Xun,YU Min.Experimental study of fractal dimension of AE serials of different rocks under uniaxial compression[J].Rock and Soil Mechanics,2012,33(12):3561-3569. |
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| Authors: | WU Xian-zhen LIU Xiang-xin LIANG Zheng-zhao YOU Xun YU Min |
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| Institution: | 1. School of Resources and Engineering, Jiangxi University of Science and Technology, Ganzhou,Jiangxi 341000, China; 2. College of Mining Engineering, Hebei United University, Tangshan, Hebei 063009, China; 3. Center of Rock Instability and Seismicity Research, Dalian University of Technology, Dalian, Liaoning 116024, China; 4. Masteel Design & Research Institute Co., Ltd., Maanshan, Anhui 243000, China |
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| Abstract: | Fractal dimension of AE (acoustic emission) serials of different types of rocks was investigated by uniaxial compression test. The complete stress-strain curves, the AE characteristics and the fracture patterns were obtained. The rupture instability specimens of destruction were observed; and the load change relationships of failure process were analyzed. Different mechanical properties, the AE sequence of time domain features and fractal feature of different rocks were researched emphatically. The results show that the AE rates ad AE energy rates can be very good to describe the collapse of the rock masses. The correlation dimension of the AE rates and AE energy rates during the progressive failure process has a strong characteristic of fractal feathers. The fractal dimension of AE sequences reflected the statistical evolution of the initiation and propagation of the microcracks in the rocks. The fractal dimension for all the specimens decreased when the loading stress increased. The evolutions of the fractal dimension of AE during failure can be divided into a mode for rocks. The fractal dimension for a mode of “fluctuation→gradual descending”. The descent of the fractal dimension can be regarded as the precursor information to predict the collapse of the rock masses. |
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| Keywords: | rock mechanics failure instability acoustic emission (AE) fractal the mode of evolution |
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