水利水电技术（中英文）2024，Vol.55Issue(1)：40-50,11.DOI:10.13928/j.cnki.wrahe.2024.01.004
堆石混凝土劈裂抗拉破坏过程中声发射特征分析
Analysis of acoustic emission characteristics during the splitting tensile failure process of rock filled concrete
摘要
Abstract
[Objective]Investigating acoustic emission characteristics during the splitting tensile failure process of rock filled con-crete(RFC)and self-compacting concrete(SCC),and further determining the ultimate crack patterns are helpful to understand the splitting failure characteristics of RFC and SCC,so as to ensure the reliability and safety of the structure.[Methods]Cubic specimens with a side length of 600 mm were prepared for RFC and SCC.The relationship between acoustic emission parameters(ringing counts and cumulative ringing counts)and displacement-load curves during the splitting tensile failure of RFC and SCC was investigated.Statistical method(RA and AF)were employed to analyze the crack evolution characteristics based on acoustic emission signals.Furthermore,a Hybrid Gaussian Mixture Model(GMM)based on RA-AF values was used to identify the crack-ing modes(tensile cracking or shear cracking)of RFC and SCC during splitting tensile failure.[Results]The results show that in the process of splitting failure,the distribution of RFC acoustic emission ringing count is uneven,showing the characteristics of segmented change.The cumulative ringing count shows an obvious step-like rise.The distribution of SCC acoustic emission rin-ging count is uniform,and the cumulative ringing count rises gently.The tensile crack area of RFC and SCC corresponds to the RA-AF data point moving closer to the AF axis,and the shear crack area corresponds to the RA-AF data point moving closer to the RA axis,both of which show obvious origin concentration.[Conclusion]The conclusion are as follows:(1)The splitting tensile strength of RFC and SCC is 0.065 and 0.067 times their respective cubic compressive strengths.(2)In the process of splitting tensile failure,the failure mode of RFC is mainly tensile cracking,accounting for 89.4％,and SCC is mainly shear cracking,accounting for 53.6％.(3)Using the GMM method,the classification characteristics of cracks can be more accurately captured by probability density estimation.关键词
堆石混凝土/自密实混凝土/劈裂抗拉/声发射/RA-AF/GMM/力学性能/变形Key words
rock filled concrete/self-compacting concrete/splitting tensile/acoustic emission/RA-AF/GMM/mechanical prop-erties/deformation分类
水利科学引用本文复制引用
罗滔,黄陈霖,张天祺,金峰..堆石混凝土劈裂抗拉破坏过程中声发射特征分析[J].水利水电技术（中英文）,2024,55(1):40-50,11.基金项目
国家自然科学基金青年基金项目(51909223) （51909223）
国家自然科学基金重点项目(52039005) （52039005）
陕西省青年科技新星项目(2022KJXX-85) （2022KJXX-85）
清华大学水圈科学与水利工程全国重点实验室开放基金项目(sklhse-2023-C-04) （sklhse-2023-C-04）
