标题：A new burst evaluation index of coal-rock combination specimen considering rebound and damage effects of rock
作者：Zhang, Dong-Xiao; Guo, Wei-Yao; Zang, Chuan-Wei; Gong, Xu-Fei; Li, Zhan-Hai; Qiu, Yue; Chen, Wen-guo
作者机构：[Zhang, Dong-Xiao; Guo, Wei-Yao; Zang, Chuan-Wei; Gong, Xu-Fei; Li, Zhan-Hai; Qiu, Yue] Shandong Univ Sci & Technol, Coll Energy & Min Engn, Qingdao, 更多
通讯作者地址：Guo, WY; Zang, CW; Gong, XF (corresponding author), Shandong Univ Sci & Technol, Coll Energy & Min Engn, Qingdao, Peoples R China.; Guo, WY; Zang, CW; 更多
来源：GEOMATICS NATURAL HAZARDS & RISK
关键词：Rock burst; coal-rock combination; bursting liability; index; energy
摘要：Obtaining the bursting liability is essential for rock burst mitigation. To reasonably evaluate the bursting liability of coal in deep coal mining, a new modified bursting energy index considering rebound and damage effects of rock is proposed. Then, uniaxial compressive tests of gypsum-rock combination specimens with different rock types are conducted for researching the energy evolution and bursting liability. Third, the traditional bursting energy index K-E and modified bursting energy index K-ED are compared. At last, the reasonability of K-ED is verified through PFC2D simulation. Results show: (1) When evaluating the bursting liability of coal-rock combination, the rebound and damage effects of rock must be considered. (2) The uniaxial compressive strength of gypsum-rock combination specimen nonlinearly increases with increasing rock strength, but the dynamic failure duration exponentially decreases. (3) K-E and K-ED all increase linearly when the rock strength increases. (4) The slope of fitting curve of K-ED is smaller than that of K-E, indicating that the bursting liability calculated by K-E is strengthened. (5) PFC2D simulation shows that K-ED decreases with increasing number of drilling hole in the coal component. When using K-ED to evaluate the bursting liability of coal-rock combination, it is more reasonable and applicable.