Research on the influence of cyclic stress damage on coal bursting liability

• Published in: Gong kuang zi dong hua = Industry and mine automation Vol. 49; no. 10; pp. 142 - 150
• Main Authors: YANG Yongliang, REN Jianhui, LI Xuanliang, DU Taotao
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Industry and Mine Automation 01.10.2023
• Subjects: bursting liability; coal body; coal dynamics; cyclic stress damage; impact load; residual elastic energy index
• ISSN: 1671-251X
• DOI: 10.13272/j.issn.1671-251x.2022120064

Currently, research on the dynamic behavior features of coal and rock masses only considers the influence of original geological processes such as temperature and confining pressure, without considering the impact of cyclic stress generated during coal mining on the dynamic features of coal. And the determination of the dynamic features of coal is based on the index of coal bursting liability. The impact of cyclic stress damage on coal bursting liability and its dynamic features has not been thoroughly studied. In order to solve the above problems, cyclic stress damage tests are conducted on coal samples. The variation features of coal bursting liability under two cyclic stress damage conditions, namely constant upper and lower limits and variable upper limits, are analyzed. The experimental results show the following points. ① The static compressive strength of coal under the action of constant upper and lower limit cyclic stress and variable upper limit cyclic stress has decreased by 13.86% and 16.00%, resp