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| Dynamic failure of manufactured similar rock plate containing a single fissure |
| WANG Qizhi1，2，WU Bangbiao1，2，LIU Feng1，2，XIA Kaiwen1，2，WANG Wei3 |
(1. State Key Laboratory of Hydraulic Engineering Simulation and Safety，Tianjin University，Tianjin 300072，China；2. School of Civil Engineering，Tianjin University，Tianjin 300072，China；3. School of Civil Engineering，Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China)
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Abstract A cement mortar plate containing a single flaw was used to simulate the rock mass. The flaw in each sample has an angle with respect to the loading direction from 0° to 90°. A modified split Hopkinson pressure bar (SHPB) system was used to carry out the dynamic compression test to the plate specimen and a high-speed imaging system was used to record the crack propagation under different loading rates. The surface of the plate specimen was coated with a speckle pattern and the digital image correlation(DIC) technique was adopted to analyze the characteristics of the fracturing process. The testing results indicate that the failure of the cemented mortar plate with a single flaw is mainly the X type and the strength of the specimen increases with the loading rate under a given orientation of flaw. The orientation of the flaw is the main factor influencing the strength of specimens. The shear cracks and tensile cracks were observed to be the dominant crack types. The crack propagation path，stress field，crack initiation and propagation process were also analyzed with the DIC method. The correlation between the dynamic initiation fracture toughness and the classical criterion of mixed cracks under different loading rates and different joint angles was analyzed.
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2018, Vol. 37 
