Experimental study on the mechanics and deformation failure characteristics of multi-source coal-based solid waste cemented backfill

Authors

YANG Ke, Key Laboratory of Safe and Effective Coal Mining Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China; Institute of Energy, Hefei Comprehensive National Science Center, Hefei 230031, China; School of Mining Engineering, Anhui University of Science & Technology, Huainan 232001, ChinaFollow
ZHANG Jiqiang, Key Laboratory of Safe and Effective Coal Mining Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China; School of Mining Engineering, Anhui University of Science & Technology, Huainan 232001, ChinaFollow
HE Xiang, Key Laboratory of Safe and Effective Coal Mining Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China; School of Mining Engineering, Anhui University of Science & Technology, Huainan 232001, China
WEI Zhen, School of Civil Engineering, Lanzhou Institute of Technology, Lanzhou 730050, China
ZHAO Xinyuan, Key Laboratory of Safe and Effective Coal Mining Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China; School of Mining Engineering, Anhui University of Science & Technology, Huainan 232001, China

Abstract

[Objective] In order to study the mechanical properties and deformation failure laws of multi-source coal-based solid waste cemented backfill (CBSWCB), the uniaxial compression, acoustic emission response and microstructure test experiments were carried out with 5 types of typical coal-based waste. [Methods] The factors influencing the uniaxial compressive strength of CBSWCB, as well as their interaction, were analyzed, and a four-dimensional spatial visualization model of the factors influencing the compressive strength based on their interactions was established. Besides, the mechanical evolution characteristics and macroscopic deformation failure laws under uniaxial compression conditions were elaborated by referring to the acoustic emission and microstructure characteristics of CBSWCB. Further, the hydration mechanism of CBSWCB during the loading process and the macroscopic and microscopic relation were demonstrated from the microscopic point of view. [Results and Conclusions] The test results show that: (1) Mass fraction is the main factor influencing the uniaxial compressive strength, while the blending amount of furnace bottom slag has the least influence. (2) Under the uniaxial compression, the macroscopic deformation failure of CBSWCB transforms from plastic and weak splitting failure to brittle and shear failure. (3) The evolution of acoustic emission parameters of CBSWCB specimen can be divided into the rising stage, the quiet stage, the active stage and the stable stage. the cumulative ring count curve of acoustic emission shows an obvious "step-like" increase trend, with slow increasing in the rising and stable stages, sharp increasing in the active stage, and gradual leveling-off in the stable stage. (4) The low cement dosing and property difference of multi-source coal-based solid waste cemented backfills result in limited hydration, and the low number of hydration products is the main reason for the generally low uniaxial compressive strength of CBSWCB. The research results could provide a certain reference basis for the use of multi-source coal-based solid waste in cut-and-fill mining.

Keywords

coal-based solid waste, cemented backfill, deformation failure, acoustic emission characteristics, spatial visualization, hydration

DOI

10.12363/issn.1001-1986.24.03.0188

Recommended Citation

YANG Ke, ZHANG Jiqiang, HE Xiang, et al. (2024) "Experimental study on the mechanics and deformation failure characteristics of multi-source coal-based solid waste cemented backfill," Coal Geology & Exploration: Vol. 52: Iss. 6, Article 11.
DOI: 10.12363/issn.1001-1986.24.03.0188
Available at: https://cge.researchcommons.org/journal/vol52/iss6/11

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