Effect of bedding angle on dynamic fracture behavior of natural rock materials
WANG Yanbing1，2，FU Dairui1
(1. School of Mechanics and Civil Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；
2. State Key Laboratory of Geomechanics and Deep Underground Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China)
Abstract：In order to explore the dynamic fracture behavior of rock materials under different bedding angles，the dynamic fracture impact test were carried out on three kinds of notched semi-circular bend rock specimens in 30°，45°，60°，75° and 90° bedding angles using the split Hopkinson pressure bar impact loading system. The stress wave and energy propagation law，stress response characteristics and dynamic fracture toughness of the three rock specimens under different bedding angles conditions were studied. DLSM numerical simulation software is used to assist analysis，which proves that the simulation method can be well applied to the study of rock dynamic fracture behavior. Stress wave propagation images and crack tip stress field images are used to analyze the stress wave transmission law of specimens，and explain the mechanism of dynamic fracture toughness changing with the bedding angle. Combined with kinetic energy and failure curves of the model，failure characteristics of rocks under different bedding angles are summarized. The results show that the change of bedding angle will affect the effective reflection area of the stress wave，and thus affect the transfer law of reflected wave and transmitted wave，resulting in the change of the energy ratio of each part. The three kinds of rocks have different failure characteristics，but their dynamic fracture toughness is affected by the bedding angle，and precracking and tensile failure are more likely to occur at small bedding angle，leading to the reduction of specimen strength. The simulated stress wave propagation image explains the transreflectance law of stress waves at different bedding angles，while the stress field image of crack tip reflects that the dynamic fracture toughness is related to the occurrence of premature failure in the specimen. With the increase of the bedding angle，the larger the kinetic energy consumed by the fracture of the specimen，the more uniform the failure.
王雁冰1，2，付代睿1. 层理角度对天然岩石材料动态断裂行为的影响研究[J]. 岩石力学与工程学报, 2023, 42(4): 849-867.
WANG Yanbing1，2，FU Dairui1. Effect of bedding angle on dynamic fracture behavior of natural rock materials. , 2023, 42(4): 849-867.
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2023, Vol. 42 
