分形矸石胶结充填体的宏细观力学特性

doi:10.13722/j.cnki.jrme.2021.0234

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Abstract In order to investigate the macroscopic and mesoscopic mechanical properties of cemented waste rock backfill using fractal gangue，the ultrasonic detection，uniaxial compression and microscopic scanning tests were carried out on cemented waste rock backfill of which the aggregate size distribution satisfies fractal theory. The ultrasonic，strength，deformation and microstructure characteristics of cemented waste rock backfill were studied. A particle flow model considering the aggregate size distribution，multiple particle media and contact boundaries was constructed for simulating cemented waste rock backfill. The evolution laws of the energy，crack，force chain and particle failure of cemented waste rock backfill during the whole loading process were explored. The influencing mechanism of the aggregate size distribution on the mechanical property of cemented waste rock backfill was revealed from the microscopic and mesoscopic views. The results show that the ultrasonic pulse velocity and the compressive strength of cemented waste rock backfill have a quadratic polynomial relationship with the fractal dimension of the aggregate size distribution，while the peak strain is negatively correlated with the fractal dimension. The fractal dimension of the optimal aggregate size distribution for cemented waste rock backfill is between 2.4–2.6，which shows a more uniform microstructure. The peak strain energy of cemented waste rock backfill increases firstly and then decreases with the fractal dimension of the aggregate size distribution，but the low fractal dimension of the aggregate size distribution is more conducive to strengthening the friction effect in the structure. The cracks initiate from the stress concentration of the sharp corners of aggregates in cemented waste rock backfill，develop along the cementing-aggregate boundaries，and propagate along the weakest or thinnest cemented matrix to the adjacent sharp corners of aggregates or fracture interfaces in the cemented matrix. The fractures of local force chains are prone to occur in the cemented waste rock backfill with a low fractal dimension of the aggregate size distribution，showing obvious early local crack accumulation and particle bulking. The increase of the fractal dimension of the aggregate size distribution can weaken this local failure characteristic，but the increase of the fine aggregate proportion causes the expansion of the interfacial transition zone，which induces more force chain fractures of cementing-aggregate boundaries.

Key words： mining engineering cemented waste rock backfill aggregate size distribution mechanical property microstructure mesostructure evolution

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	Articles by authors
	WU Jiangyu1
	JING Hongwen1
	PU Hai1
	ZHANG Xinguo2
	3
	MENG Qingbin1
	YIN Qian1

Cite this article:

WU Jiangyu1,JING Hongwen1,PU Hai1, et al. Macroscopic and mesoscopic mechanical properties of cemented waste rock backfill using fractal gangue[J]. , 2021, 40(10): 2083-2100.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0234 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I10/2083

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