矸石胶结充填体单轴压缩损伤破坏尺寸效应研究

doi:10.13722/j.cnki.jrme.2021.0527

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Abstract In order to study the influence of size on damage and failure of cemented gangue backfill body(CGBB)，cube specimens with sizes of 70.7，100，150，200 and 300 mm were prepared for uniaxial compression test. The acoustic emission(AE) and resistivity values of specimens during loading were monitored，and the micro morphology of the specimens was observed by scanning electron microscope. The damage evolution and failure mode of CGBB with different sizes were discussed. The results show that the uniaxial compressive strength of CGBB decreases with increasing the size，and the failure mode of CGBB gradually changes from splitting failure to shear failure with increasing the size. The smaller CGBB shows stronger AE activity in the initial compaction stage than in the post-peak failure stage. The sudden change of AE ringing and the stable stage of resistivity can be used as the precursor to judge the failure of CGBB. According to the test results，a calculation formula of size effect law of the compressive strength of CGBB and a damage constitutive model of CGBB with different sizes were established，which can provide reference for the design of backfill body in structural backfill.

Key words： mining engineering cemented gangue backfill body size effect failure mode acoustic emission resistivity micro morphology damage model

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	Articles by authors
	GUO Yuxia1
	2
	ZHAO Yonghui1
	2
	FENG Guorui1
	2
	RAN Hongyu1
	2
	ZHANG Yujiang1
	2

Cite this article:

GUO Yuxia1,2,ZHAO Yonghui1, et al. Study on damage size effect of cemented gangue backfill body under uniaxial compression[J]. , 2021, 40(12): 2434-2444.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0527 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I12/2434

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