煤柱–坝体协同承载体细观裂纹扩展及损伤特征分析

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Abstract The safety of the underground space storage geologic synergistic carrier is crucial for developing energy/carbon storage engineering. Based on the indoor uniaxial compression test of the sequestered geologic synergistic carrier constructed by coal pillar-dam，the UDTensor，the UDScalar and the Ball displacement_mag in discrete element particle flow PFC are respectively used to map the stress cross，the crack hot spot field and the displacement field，to analyze and study the evolution of the stress field-crack distribution-displacement field and the microscopic damage characteristics of the carrier during the loading process. The results show that the synergistic carrier specimen is mainly damaged by oblique shear，the rupture surface is inverted “V” type，and the shear expansion characteristics are weakened with the increase of the proportion of rock. The number of cracks in the specimen overall shows the change of“emergence-slowly-accelerating”characteristics，and after entering the damage stage，the coal monomer is damaged by the cracks. After entering the destruction stage，the shear and tension of coal monomer and rock monomer almost play a role at the same time，and the shear effect of the synergistic carrier is stronger than the tension；the concentration and transfer of stress(change in the length and direction of the stress cross)，the formation of microscopic damage(crack budding，nucleation) and accumulation，and then dominate the macro rupture(crack expansion，penetration)，which intuitively reveals the process of the accumulation of microscopic damage to macro rupture. The process of the accumulation of microscopic damage to macroscopic rupture is revealed intuitively. Finally，it is a reliable method to recognize the characteristic strength of rock samples based on the changes in crack number(emergence) and crack length(extension). Among them，the change of shear crack number can recognize the initiation strength of the specimen earlier，and the extension rate of tensile crack length can realize the damage strength earlier. The results of the study provide a theoretical basis for a deeper understanding of the microscopic damage and safety and stability monitoring of geologically synergistic bearers sealed in underground space.

Key words： mining engineering underground space sealing coal pillar-dam synergistic carrier crack propagation damage characteristics

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	TANG Yiju1
	2
	JIA Bing1
	HAO Tianxuan2
	3
	LOU Quan1
	LIU Jing1
	LU Fangchao1
	LIU Sheng1
	WAN Xiangyun1
	LI Chaohan1

Cite this article:

TANG Yiju1,2,JIA Bing1, et al. Characterization of fine-scale crack extension and damage in coal pillar-dam synergistic carrier[J]. , 2024, 43(12): 3081-3095.

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https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I12/3081

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