Early Mechanical Properties and Energy Evolution Characteristics of Alkali Slag Modified Backfill

被引：0
|
作者：
Sun H. [1 ,2 ]
Gan D. [1 ,2 ]
Xue Z. [1 ,2 ]
Liu Z. [1 ,2 ]
Zhang Y. [1 ,2 ]
机构：
[1] College of Mining Engineering, North China University of Technology, Hebei, Tangshan
[2] Mining Development and Safety Technology Key Laboratory of Hebei Province, North China University of Technology, Hebei, Tangshan
来源：
Cailiao Daobao/Materials Reports | 2024年 / 38卷 / 09期
基金：
中国国家自然科学基金;
关键词：
alkali slag modified backfill; energy evolution characteristic; failure model; proportional parameters optimization; uniaxial compressive strength;
D O I：
10.11896/cldb.22070248
中图分类号：
学科分类号：
摘要：
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. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
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