多源煤基固废充填体强度演化规律及声发射特征

doi:10.13722/j.cnki.jrme.2021.1264

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Abstract Twenty-nine groups of cube specimens with a size of 70.7 mm were prepared to explore the mechanical properties of the multi-source coal-based filling body of solid wastes. The compressive strength of the filling specimens at different ages was obtained by using an uniaxial compression test system. The micromorphology and material composition of the raw materials were analyzed by XRD and SEM，and the cross-section micromorphology of the specimens at different ages was collected，to reveal the strength evolution law of the filling body. The effects of each component on the filling body strength at different ages(3，14，and 28 d) were studied based on the response surface method，and the acoustic-emission characteristics of the specimens in the whole failure process were monitored adopting an acoustic-emission test system. The results show that the influence of fly ash on the strength of the specimen is most significant，followed by gangue，desulfurization gypsum and 1∶1 mixture of gasification slag and bottom slag. Analysis by the response surface method presents that fly ash and gangue significantly affect the compressive strength of the filled specimens. The newly formed rod-shaped crystals and honeycomb cotton-flock cementitious materials gradually increase with age，which increases the strength of the filling body. The strength of the specimens at 3 d age is the maximum，and the increment of the strength of the specimens increases is largest at 3–14 d age followed by that at 14–28 d age. At the plastic-deformation stage，a few ring counts and small-amplitude energy release exist，and fine cracks appear on the specimen surface，which gradually evolve into through cracks. At the yield failure stage，the acoustic emission ring count increases sharply，and the energy accumulated in the specimen is released suddenly through the cracks on the specimen surface，resulted in the specimens to gradually crack and collapse. At the post-peak stage，the specimens still have a certain strength，and the acoustic emission event is still active，accompanied by energy release. The research results provide a basis for optimizing the filling-material ratio in the engineering site.

Key words： mining engineering coal-based solid wastes filling mining filling body mechanical properties acoustic emission response surface method

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	HUA Xinzhu1
	2
	CHANG Guanfeng1
	2
	LIU Xiao1
	2
	3
	YANG Ke1
	2
	CHEN Denghong1
	2
	LI Chen1
	2
	WANG Enqian1
	2

Cite this article:

HUA Xinzhu1,2,CHANG Guanfeng1, et al. Strength evolution law and acoustic-emission characteristics of multi-source coal-based filling body of solid wastes[J]. , 2022, 41(8): 1536-1551.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1264 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I8/1536

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