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不同加载模式下岩石声发射及其分形特征分析 预览

Acoustic Emission and Fractal Characteristics of Rock under Different Loading Modes
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摘要 利用MTS815Flex Test GT岩石力学试验设备和PCI-2AE实时三维定位监测系统,对灰岩进行单轴压缩和巴西劈裂损伤破坏过程中声发射事件分形特征进行了研究。结果表明,不同的声发射特征可反映岩石在不同加载方式下的声发射内部活动特性和内部破裂过程;劈裂加载条件下的声发射分形维数普遍大于单轴加载条件,单轴加载条件下的声发射活动性强于劈裂加载条件,劈裂加载条件下岩石的破裂尺度较小,裂纹的扩展分布较均匀;不同加载条件下的破裂过程中,声发射分形维数整体上均呈现下降趋势,且在岩石试样破坏前下降到最低值,表明岩石失稳破坏是一个降维有序的过程。 The limestone samples are tested on MTS815 Flex Test GT rock mechanics test system under uniaxial compression condition and brazilian test condition,and the acoustic emission events are monitored by PCI-2 AE system during whole test process.The experimental results show that,(a) the characteristics of acoustic emission can reflect the internal activity characteristics and internal rupture process of rock under different loading modes;(b) the fractal dimension of acoustic emission under splitting loading is generally larger than that under uniaxial loading,which indicates that the acoustic emission activity under uniaxial loading is stronger than that under splitting loading,and under the condition of splitting loading,the fracture size of rock is smaller and the distribution of cracks is more uniform;and (c) the fractal dimension of acoustic emission shows a downward trend throughout the fracture process under different loading conditions,and it decreases to the lowest value before the rock specimen is destroyed,which indicates that the rock instability and failure is a process of dimensionality reduction.
作者 王崔林 许强 刘文德 WANG Cuilin;XU Qiang;LIU Wende(Chengdu University of Technology,Chengdu 610059,Sichuan,China;State Key Laboratory of Geohazards Prevention and Geoenviroment Protection,Chengdu 610059,Sichuan,China)
出处 《水力发电》 北大核心 2019年第4期33-38,115共7页 Water Power
基金 国家自然科学基金重点项目(41630640).
关键词 岩石力学 单轴压缩试验 巴西劈裂试验 声发射 分形特征 关联维数 rock mechanics uniaxial compression test brazilian test acoustic emission (AE) fractal characteristics relevant dimension
作者简介 王崔林(1992-),男,河南封丘人,硕士研究生,研究方向为岩土工程.
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