Study on mechanical properties of coal gangue and fly ash mixture as backfill material based on fractal characteristics

Li, Wei; Yue, Lei; Liu, Yu; Li, Shuncai; Ma, Liqiang; Wang, Jintao

doi:10.1007/s11356-023-30221-4

Cited by 5 publications

(1 citation statement)

References 26 publications

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“…At present, many scholars have done a lot of researches on the mechanical properties of the different backfill materials, and have achieved plenteous research achievements. Through the seepage test of coal gangue materials, Li [4] found that that adding a certain concentration of coal fly ash can achieve a better water barrier. Nie [5] revealed that significant differences in the mechanical properties, acoustic emission (AE) responses, maximum principal strain fields, and ultimate failure modes of CGBS under different static-dynamic combined loading paths.…”

Section: Introductionmentioning

confidence: 99%

Study on Bingham fractional damage model of backfill material under different moisture content conditions

Wang,

Yang,

et al. 2024

PLoS ONE

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Filling mining technology is an important representative technology to realize green and low-carbon mining. The backfill materials have distinct rheological characteristics under the long-term action of formation loads and groundwater seepage. In order to study the creep characteristics of backfill materials under different moisture contents and reveal their aging-mechanical properties, based on the Riemann-Liouville fractional calculus and damage mechanics theory, the fractional element and damage variables are introduced to improve the traditional Bingham model, and the fractional Bingham creep damage model is proposed. Based on the experimental data of gangue cemented backfill under different moisture content, the parameters of the creep model are obtained by using user-defined function fitting and the least square method. The results show that the improved Bingham fractional creep damage model can describe the whole creep process of backfill materials under different moisture contents, and the rationality of the model is verified. Compared with the traditional Bingham model, the fitting degree of the Bingham fractional creep damage model is higher, which solves the problem that the traditional Bingham model cannot describe the nonlinear creep stage. Model parameter α and ξ increase with the increase of axial stress and moisture content. Under the same moisture content, η gradually increases with the increase of axial stress. This work has a certain reference significance for studying the mechanical properties and creep constitutive model of backfill materials containing water.

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Section: Introductionmentioning

confidence: 99%

Study on Bingham fractional damage model of backfill material under different moisture content conditions

Wang,

Yang,

et al. 2024

PLoS ONE

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Control effect of overburden grout injection on surface subsidence and groundwater quality pollution

Bai,

Li,

Guo

et al. 2024

Bull Eng Geol Environ

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Experimental Study on Permeability Characteristics of Compacted Backfill Body after Gangue Grouting and Backfilling in the Mining Space

Xu,

Liu,

Wang

et al. 2024

Applied Sciences

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The timely injection of gangue slurry into the mining space formed after coal mining can scale up the disposal of gangue and control surface deformation. However, the waterproof effect of gangue slurry in the mining space remains unclear, necessitating urgent investigation into the permeability characteristics of compacted backfill bodies of gangue slurry under the action of overburden. In this study, a multi-field coupled seepage test system for backfill materials was developed based on Forchheimer’s nonlinear seepage law, and a laboratory preparation method for compacted backfill body (CBB) of gangue slurry after grouting and backfilling in mining space under pseudo-triaxial conditions was proposed. Additionally, the pressure bleeding characteristics of gangue slurry under the action of overburden were studied, the variation law of permeability of the CBB with the axial pressure, a particle size range, and cement dosage was revealed, and the determination method for the permeability level of the CBB and its optimization method were put forward. The research results indicate that there are obvious staged characteristics in the pressure bleeding changes in gangue slurry. Axial pressure, particle size range, and cement dosage all have a significant impact on the permeability of the CBB. The permeability level of the CBB of gangue slurry is within the range of poor permeability and extremely poor permeability. After backfilling into the mining space, gangue slurry exhibits a significant water-blocking effect.

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Study on mechanical properties of coal gangue and fly ash mixture as backfill material based on fractal characteristics

Cited by 5 publications

References 26 publications

Study on Bingham fractional damage model of backfill material under different moisture content conditions

Study on Bingham fractional damage model of backfill material under different moisture content conditions

Control effect of overburden grout injection on surface subsidence and groundwater quality pollution

Experimental Study on Permeability Characteristics of Compacted Backfill Body after Gangue Grouting and Backfilling in the Mining Space

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