Mesoscopic simulation for damage and failure of rock with double-fractures under dynamic compression

2018 International Conference on Civil, Architecture and Disaster Prevention

土木建筑工程

Yuan, Yue^1^2 ; Fu, Jinlei^3 ; Qin, Jian^3

Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Xiangtan, Hunan

411201, China^1

Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Xiangtan, Hunan

411201, China^2

School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan

411201, China^3

关键词: Damage and failure;    Damage variables;    Dynamic compression;    Elastic strain energy;    Mesoscopic simulation;    Particle flow code;    Underground mining;    Uniaxial dynamic compression;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/218/1/012123/pdf
DOI  :  10.1088/1755-1315/218/1/012123

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Aiming at instability of rock pillar subjected to dynamic load in underground mining, damage and failure process of rock with double-fractures under uniaxial dynamic compression was simulated by particle flow code (PFC). Mesoscopic damage variable was defined based on the number of fracture bonds between particles, and damage characteristics of the rock with double-fractures was analysed. Then change laws of rock peak strength, cracks distribution, accumulation and release of elastic strain energy were revealed, furthermore the internal cause for accelerated growth of rock sample microcracks post peak was obtained. The results show that the number of cracks on rock with double-fractures increases with the peak strength under uniaxial dynamic compression. Compared with large-size fractures, the rock sample with small-size fractures takes longer to reach peak strength and have higher bearing capacity. Additionally the number of microcracks on the rock sample is positively correlated with the mesoscopic damage variable (D), while the elastic strain energy accumulated at the peak and the peak strength are all negatively correlated with the length of fracture B.