细观组构特征对含U型切槽岩石梁断裂特性的影响规律

doi:10.13722/j.cnki.jrme.2022.1148

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Abstract In order to reveal the influence of microstructural features on the fracture characteristics of rock beams with a U-shaped notch，the theoretical relationships of the rock apparent fracture toughness KIN with the inherent fracture toughness KIC，the critical distance L，as well as the notch radius ? were established based on the theory of critical distance. A new approach to calculate KIC and L was proposed. Then，the discrete element method was used to built two groups of rock grain-based models，one of which is different in grain size，and another group is different in heterogeneity. Both of them were employed to conduct three-points bending simulation test to obtain the fracture mechanical parameters of KIN，KIC and L. Furthermore，the influences of the grain size and heterogeneity of rock on KIC and L were studied. The results show that，the obtained KIC and L from numerical tests have a good agreement with the values calculated by the theoretical equation，which indicates that the numerical experiment is highly reliable. The microstructural features have a significant influence on the rock fracture characteristics. With the increase of grain size，the rock fracture toughness KIC gradually decrease，while the critical distance L gradually increase. Additionally，KIC and L are both decreased with the increasing of rock heterogeneity.

Key words： rock mechanics rock fracture fracture toughness critical distance grain-based discrete element model heterogeneity

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	Articles by authors
	WANG Zhao1
	2
	WANG Tiehang2
	WANG Haiquan1
	WANG Weiqin1
	SHI Guangbin1

Cite this article:

WANG Zhao1,2,WANG Tiehang2, et al. Influence of microstructural features on the fracture characters of rock beams with a U-shaped notch[J]. , 2023, 42(9): 2175-2189.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1148 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I9/2175

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