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| Experimental study on the size effect of crack propagation process of disk samples containing parallel double pre-existing flaws |
| ZHANG Xulong1，ZHANG Sheng1，2，AN Dingchao1，CHEN Zhao1，WANG Zheng1 |
| (1. College of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454001，China；
2. Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization，Jiaozuo，Henan 454001，China) |
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Abstract In view of the size effect of internal crack propagation and penetration when rocks of different sizes containing multiple flaws are loaded，sandstone disk samples with diameters of 50，100，150 and 200 mm containing parallel double flaws were made. Their thickness，flaw length and flaw spacing change in proportion to the diameter. Static loading tests were carried out on disc samples on GCTS RTX–3000 testing machine，and the crack propagation process of the samples was monitored by comprehensively using acoustic emission(AE) and digital image correlation(DIC) technology. The results show that with the increase of the sample size，the failure load increases linearly，the weakening effect of prefabricated flaws on the bearing capacity of the samples is enhanced，and the energy consumed per unit volume of sample failure decreases gradually. There is a competitive relationship between multiple crack propagation. The crack initiation sequence determines the propagation direction. The crack propagation of samples with diameters of 50，100 and 200 mm has the same direction. Cracks expand in opposite directions of samples with diameter of 150 mm. AE can accurately reflect the damage evolution process inside the sample. Using DIC technology to digitize the crack propagation process，the crack opening displacement and propagation speed can be accurately analyzed. The variation law of crack propagation speed of samples with different sizes is similar，that is，the crack starts to grow at a low initial speed and reaches a peak speed within a short distance，then the propagation speed drops sharply，and the final crack propagation speed decreases slowly and tends to be stable.
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2023, Vol. 42 
