早期受载对矸石胶结充填体力学特性及损伤破坏的影响

doi:10.13722/j.cnki.jrme.2021.0829

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Abstract In order to study the effect of the early load on the later mechanical properties of cemented gangue backfill(CGB)，the specimens cured for 7 days were loaded at 4 stress levels，and after 28 days of continuously loading，unloaded and used for carrying out uniaxial compression test. The ultrasonic wave velocity changes in the CGB during the continuous loading process and the acoustic emission response characteristics during the uniaxial compression process were monitored，and the microscopic morphology of the specimens was observed using a scanning electron microscope. The results show that the early load has a great influence on the mechanical properties of the CGB. When the early stress level is less than 80%，the load has a significant strengthening effect on the compressive strength and the elastic modulus of the CGB. With increasing the early stress level，the transverse strain and the Poisson¢s ratio increase exponentially，and the specimen failure form gradually changes from shear failure to split failure. The ultrasonic wave velocity shows obvious multistage characteristics during the continuous load process，and the acoustic emission activity of the CGB subjected to high stress levels decreases. Early load promotes cement hydration reaction and contributes to the improvement of the strength. According to the test results，a damage evolution model of the early loaded CGB was established under uniaxial compression，which can provide a basis for the design of the backfill in the structural filling.

Key words： mining engineering cemented gangue backfill early load mechanical property failure characteristic ultrasound acoustic emission microscopic mechanism

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	FENG Guorui1
	2
	XIE Wenshuo1
	2
	GUO Yuxia1
	2
	GUO Jun1
	2
	RAN Hongyu1
	2
	ZHAO Yonghui1
	2

Cite this article:

FENG Guorui1,2,XIE Wenshuo1, et al. Effect of early load on mechanical properties and damage of cemented gangue backfill[J]. , 2022, 41(4): 775-784.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0829 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I4/775

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