煤矿安全2024，Vol.55Issue(8)：116-123,8.DOI:10.13347/j.cnki.mkaq.20231349
不同加载速率下煤体表面变形特性及能量演化特征研究
Study on deformation characteristics and energy evolution of coal under different loading rates
摘要
Abstract
The digital image correlation(DIC)technology was used to investigate the evolution law of the coal surface strain field under different loading rates and to analyze the influence of loading rate on the evolution of the deformation field,deformation local-ization,and surface deformation energy density.The experimental results indicate that the higher the loading rate is,the more com-plete the final failure mode of the coal body,and the failure mode of the coal body also transitions from shear failure to tensile fail-ure;the loading rates of different magnitudes also affect the localization time of coal deformation.The higher the loading rate is,the greater the proportion of the initiation time of coal deformation localization to the overall failure time.The higher the loading rate is,the more obvious the growth trend of deformation energy density before deformation localization,and the more energy accumulates in the surface deformation localization area;the qreater the stress at the start time of deformation localization.关键词
加载速率/煤体表面变形/数字散斑技术/变形能密度/变形局部化Key words
loading rate/coal surface deformation/digital image correlation/deformation energy density/deformation localization分类
矿业与冶金引用本文复制引用
金鹏,刘影,冯俊军,李世庚,曲远方..不同加载速率下煤体表面变形特性及能量演化特征研究[J].煤矿安全,2024,55(8):116-123,8.基金项目
国家自然科学基金资助项目(52104175) （52104175）
中国博士后科学基金面上资助项目(2022M712935) （2022M712935）
