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作 者:邢鹏飞 袁杰 吴亚华 周煌 XING Pengfei;YUAN Jie;WU Yahua;ZHOU Huang(Nuclear Industry Jingxiang Construction Group Co.,Ltd.,Huzhou 313002,Zhejiang,China)
机构地区:[1]核工业井巷建设集团有限公司,浙江湖州313002
出 处:《水力发电》2022年第8期41-49,共9页Water Power
摘 要:为研究岩石各变形阶段裂纹扩展形式,利用声发射特征参数分布规律判别单轴压缩试验条件下3类岩石整体及4个变形阶段破坏裂纹模式。结果显示,黄砂岩和细粒大理岩呈现出低AF、高RA值分布特点和峰值频率主要集中分布在0~100 kHz的规律,整体以剪切型裂纹破坏为主,且各阶段都以剪切型破坏为主要裂纹扩张形式;细粒花岗岩则随着应力的增大,裂纹扩张形式从拉伸型转向拉-剪复合型裂纹,最终以拉伸裂纹破坏为主。此外,岩石裂纹非稳定发展阶段声发射信号特征对岩石整体声发射信号特征起决定性作用。In order to study the crack propagation forms in rock compression at various deformation stages,the distribution of acoustic emission characteristic parameters is used to distinguish the failure crack modes of three typical rock as a whole and four kinds of deformation stages under uniaxial compression test.The results show that,(a)the yellow sandstone and fine marble exhibit a concentrated distribution range of low AF,high RA and peak frequency of 0-100 kHz,and the shear crack failure is the main failure mode and the shear failure mode is the main crack expansion mode at each stage;(b)with the increase of stress,the crack propagation mode of fine-grained granite changes from tensile type to tension-shear type,and the tensile crack is the main failure mode.In addition,the acoustic emission signal characteristics of rock crack in unstable development stage play a decisive role in the overall acoustic emission signal characteristics of rock.
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