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| Study on the fracture characteristics and evolution mechanisms of Beishan granite under different crack propagation rates |
| ZHANG Dengke1，MENG Tao2，HAN Yang1，3，WANG Chuanle4，LU Hui5，LI Erbing1 |
(1. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact，Army Engineering University of PLA，Nanjing，Jiangsu 210007，China；2. College of Energy Materials and Engineering，Taiyuan University of Science and Technology，Taiyuan，Shanxi 030024，China；3. Nanjing Urban Construction Management Group Co.，Ltd.，Nanjing，Jiangsu 210006，China；4. School of Transportation，Southeast University，Nanjing，Jiangsu 211189，China；5. College of Field Engineering，Army Engineering University of PLA，Nanjing，Jiangsu 210007，China)
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Abstract Investigating the fracture characteristics of rocks subjected to variable crack propagation rates is essential for analyzing and forecasting the stability and safety profiles of engineering infrastructures. To study the fracture behavior of Beishan granite under different main crack propagation rates，five different loading rates were set to achieve different crack propagation rates. During the test，digital image correlation(DIC) technology and three dimensional laser scanning technology were used to obtain the deformation information and fracture surface morphology of the specimen during loading. Based on the change history of the specimen strain field，a new method for calculating the instantaneous propagation rate of the failed main crack was proposed. The result show that the loading rate/average crack propagation rate significantly affected the propagation process of the main crack. Capturing the mutation point of the strain field change history can effectively estimate the instantaneous propagation rate of the failed main crack at different times. Within the range of low and medium loading rates，the instantaneous propagation rate of the main crack showed a significant rapid growth stage and stable propagation stage. However，within the range of high loading rates，the instantaneous propagation rate of the main crack increased linearly，which directly led to an earlier initiation load stage of the fracture process zone(FPZ) and a reduction in the roughness of the fracture surface. In addition，it was found that the average propagation rate of the failed main crack was positively correlated with the fracture toughness and peak FPZ length，and negatively correlated with the fractal dimension of the fracture surface.
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2024, Vol. 43 
