碱渣改性充填体早期力学特性及能量演化特征

doi:10.11896/cldb.22070248

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Abstract To investigate the early mechanical properties and energy evolution characteristics of the alkali slag modified backfill, uniaxial compression test was carried out using WHY-600 press to analyze the compressive strength, elastic modulus, failure mode and energy change. Combined with the response surface methodology, the mass concentration, tailings gradation and alkali slag addition were analyzed to optimize the results. The results show that with the increase of alkali slag addition, the instability damage displacement, uniaxial compressive strength and elastic modulus of the backfill first increase and then decrease. When the amount of alkali slag addition is 5%, the backfill has high compressive strength and strong resistance to deformation. The dissipation energy, elastic deformation energy, strain energy per unit volume at peak strength and total energy of the backfill increase and then decrease with the increase of alkali slag addition. Under uniaxial compression, the failure model of the alkali slag modified backfill is semi-penetrating or penetrating oblique shear, parallel double crack and inverted Y-shaped fracture, and the degree of damage increases with the increase of alkali slag addition. It is recommended to prepare alkali slag modified backfill with 77% mass concentration, 3∶7 fine and coarse tailings gradation, and 5.35% alkali slag addition, and the calculated compressive strength is 5.345 8 MPa, which can satisfy the early production demand of the mine. The results provide some theoretical basis for the feasibility of alkali slag modified materials.

Key words： alkali slag modified backfill uniaxial compressive strength energy evolution characteristic failure model proportional parameters optimization

Published: 10 May 2024 Online: 2024-05-13

CLC number:

TD853

Fund:Graduate Student Innovation Fund of Hebei Province, China (CXZZBS2023127) and the National Natural Science Foundation of China (51774137, 52074124).

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	Articles by authors
	SUN Haikuan
	GAN Deqing
	XUE Zhenlin
	LIU Zhiyi
	ZHANG Yajie

Cite this article:

SUN Haikuan,GAN Deqing,XUE Zhenlin, et al. Early Mechanical Properties and Energy Evolution Characteristics of Alkali Slag Modified Backfill[J]. Materials Reports, 2024, 38(9): 22070248-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22070248 OR http://www.mater-rep.com/EN/Y2024/V38/I9/22070248

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