Experimental study on the natural mixing behaviour of waste rocks poured in a paste backfill

Zhang, Yuyu; Li, Li

doi:10.1080/17480930.2023.2235847

Cited by 2 publications

(1 citation statement)

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“…Coal mining faces a series of engineering challenges, including surface subsidence, surrounding rock deformation, and solid waste disposal. The production of coal gangue (CG), a significant solid waste issue, remains high [1,2]. The gangue filling body (GFB) technique involves mixing CG with binders, water, and other solid wastes to create a paste that is pumped into mining airspaces.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Paste Filling Body and Study on Supported Transportation Laws Using Flac3D Simulation

Wu,

Gao,

Jin

et al. 2024

Coatings

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This paper proposes a new type of gangue filling body (GFB) to address the issues of the low stability, strength, poor shrinkage performance, and inadequate seepage resistance of paste filling materials in overburdened mining conditions, as well as the challenge of fully utilizing solid waste gangue. The coal gangue (CG), U-expanding agent (UEA), and amount of water added were kept constant, and the mass ratio of the various components was adjusted to the design. The standard for filling was assessed using slump tests, uniaxial compression tests, shrinkage tests, and penetration tests. A further microscopic analysis of the pastes with an optimal filling performance was conducted using SEM. The support pressure and overburden migration patterns in the GFBs were evaluated using Flac3D. The results indicate that the GFB with ratio 4 performed best, highlighting the significant role of Portland cement (OPC). The GFB with ratio 3 demonstrated the second-best performance, suggesting that GFBs with a higher early strength should be chosen to fill hollow zones for an effective filling outcome. This study introduced a new type of paste filling material and confirmed the rock transport law of this material under overburdened conditions using Flac3D, offering significant insights for the engineering field.

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Section: Introductionmentioning

confidence: 99%