张亚芳,欧成贵,程从密,等.平行双缝倾角变化混凝土圆盘的三维动态研究[J].深圳大学学报理工版,2019,36(6):599-605.[doi:10.3724/SP.J.1249.2019.06599]
ZHANG Yafang,OU Chenggui,CHENG Congmi,et al.Three-dimensional dynamic numerical simulation of a Brazilian disc of concrete with variation of dip angle of parallel double slits[J].Journal of Shenzhen University Science and Engineering,2019,36(6):599-605.[doi:10.3724/SP.J.1249.2019.06599]
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平行双缝倾角变化混凝土圆盘的三维动态研究
张亚芳1,欧成贵1,程从密1,刘吉福2

1)广州大学土木工程学院,广东广州 510006; 2)广东省交通规划设计研究院股份有限公司,广东广州 510507

混凝土; 数值模拟; 平台巴西圆盘; 双缝倾角; 裂纹扩展; 声发射

Three-dimensional dynamic numerical simulation of a Brazilian disc of concrete with variation of dip angle of parallel double slits
ZHANG Yafang1, OU Chenggui1, CHENG Congmi1, and LIU Jifu2

1)Faculty of Civil Engineering, Guangzhou University, Guangzhou 510006, Guangdong Province, P.R.China 2)Guangdong Communication Planning & Design Institute Co. Ltd., Guangzhou 510507, Guangdong Province, P. R. China

concrete; numerical simulation; flattened Brazilian disc; parallel double slits; crack propagation; acoustic emission

DOI: 10.3724/SP.J.1249.2019.06599

备注

为研究动荷载下平行双缝倾角变化对混凝土圆盘的影响,基于有限元方法,建立平台巴西圆盘的三维动态数值模型.采用Weibull统计学理论,考虑混凝土材料的非均匀分布,研究应力波作用下平行双缝倾角变化对裂纹扩展模式的影响,得到裂纹萌生、扩展直至贯通的破坏全过程图与声发射图.结果表明,试件的破坏是劈裂性的,新生裂纹扩展的方向与动荷载加载方向一致; 声发射活动随预制裂纹倾角增大而减少; 双缝预制裂纹倾角越大,峰值荷载越大,声发射累积能量越小,试件越不容易发生破坏.

In order to study the influence of the change of the inclination angle of parallel double slits on concrete disk under dynamic load, we establish a three-dimensional dynamic numerical model of the flattened Brazilian disc by using finite element method. Non-uniform distribution of concrete materials has been realized in the model by adopting Weibull statistical theory. Moreover, we study the effect of variation of dip angle of parallel double slits on crack propagation pattern under stress wave, and obtain both diagrams of the complete failure process and acoustic emission of crack initiation, propagation and penetration. The results show that the failure of the specimen is cleavage and the direction of new crack growth is consistent with that of the dynamic load, the acoustic emission activity decreases with the increase of the dip angle of the prefabricated slits; the bigger the dip angle of prefabricated parallel double slits is, the bigger the peak load is, and the less the accumulated energy of acoustic emission is, the less likely the specimen is to be damaged.

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