Abstract
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.
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