Mechanical properties and damage evolution characteristics based on the acoustic emission of gangue and high-water-content materials based cemented paste backfill

Sun, Ke; Zhang, Jixiong; He, Manchao; Li, Meng; Wang, Chongjing; Feng, Wenchang; Li, Fengming

doi:10.1016/j.conbuildmat.2023.132324

Cited by 13 publications

(3 citation statements)

References 14 publications

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“…Gu et al [43] and Zhu et al [44,45] conducted comprehensive investigations into the flow characteristics and diffusion laws of gangue paste in underground filling spaces through similar simulations and industrial tests. Sun et al [46] and Wu et al [47] analyzed the mechanical properties and damage evolution mechanisms of coal gangue paste with high water content and viscosity using the acoustic emission, hydrodynamics, and discrete element coupling method (DEM-CFD). The studies provide theoretical support and practical guidance for the application of gangue underground filling technology.…”

Section: Introductionmentioning

confidence: 99%

Study on Ultra-Long-Distance Transportable Concentration Gradient of Coal Gangue Slurry with Different Gradations

Wang,

Yu,

et al. 2024

Minerals

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Coal gangue, the primary solid waste generated during the coal mining process, is typically disposed of on the surface, where it gradually accumulates to form gangue piles that significantly contaminate the surrounding environment. Filling technology has been widely employed for the safe and efficient disposal of coal gangue due to its sustainability, safety, and efficiency. However, there is still a lack of theoretical research on the concentration of gangue slurry in long-distance filling pipeline transportation. Therefore, a calculation model of the ultra-long-distance transportable concentration of coal gangue slurry with different grades was constructed based on the static anti-segregation performance and Bingham model. In addition, the relevant parameters of the calculation model of the ultra-long-distance transportable concentration of coal gangue slurry in this mine were determined using the 8 km pipeline transport of coal gangue slurry in one mine as the technical background. It was subsequently demonstrated that the yield stress, plastic viscosity, and mass concentration of the various grades of gangue slurry in this mine exhibit an increasing exponential function, while the slurry density and mass concentration exhibit an increasing linear function, and the mass concentration and actual flow rate correspond to a quadratic polynomial increment. Finally, the minimum and maximum concentrations for different grades of gangue slurry that can be transported over long distances in this mine were determined. This work provides theoretical and practical guidance on how to select the concentration of gangue slurry for long-distance pipeline transport.

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Section: Introductionmentioning

confidence: 99%

Study on Ultra-Long-Distance Transportable Concentration Gradient of Coal Gangue Slurry with Different Gradations

Wang,

Yu,

et al. 2024

Minerals

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“…In recent years, researchers have combined the reuse of solid waste with backfilling and mining to develop new filling materials such as tailings [8], fly ash [9][10][11][12][13], coal gangue [14][15][16][17][18] and coal gasification slag [6,[19][20][21]. The reuse of solid waste can alleviate the cost pressure of backfill mining to a large extent, but most solid waste materials (tailings, coal gangue and coal gasification slag, etc.)…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

Wang,

Chen,

Guo

et al. 2023

Materials

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Backfill mining has significant advantages in safe mining, solid waste utilization and ecological environmental protection, but solid waste materials (tailings, gangue and coal gasification slag, etc.), as derivative residues of the chemical and metallurgical industries, contain a large number of heavy metal elements, which is posing great challenges to the underground environment after backfill. In order to study the feasibility of bentonite for reducing the permeability of gangue/tailing sand cemented backfill body, relevant tests were carried out from the basic performance index, flow performance and mechanical properties of paste backfill materials. The test results show that bentonite has a significant effect on the water secretion rate of cemented fillers, and also promotes the improvement of slump and diffusion diameter of backfill slurry. The enhancement effect of mechanical properties in the early stage is not obvious, mainly concentrated in the middle and late stages of specimen curing. With the increase of bentonite content, the 28-day uniaxial compressive strength increased from 7.1 MPa and 7.9 MPa to 8.7 MPa and 9.0 MPa, respectively. Bentonite is filled between the pores of the cemented backfill with its fine particles and water swelling, which can reduce the porosity and permeability of the gangue and tailings cemented backfill. Therefore, on the premise of satisfying the flow and mechanical properties of paste backfill, bentonite can be used to improve the permeability of cemented backfill and reduce the leaching and migration of heavy metal ions.

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“…Wang [14] performed uniaxial compression acoustic emission experiments on layered paste fillers with various structural characteristics, examined the mechanical behavior and acoustic emission properties of layered paste fillers, and created a damage model based on the strain equivalence assumption and the Newtonian body assumption. Sun [15] conducted uniaxial compression acoustic emission tests on gangue-doped and high-water-content material-cemented paste filler, analyzed its damage and acoustic emission characteristics, and created damage constitutive equations based on cumulative counts of acoustic emission. Cheng [16] examined the filled body's acoustic emission properties under uniaxial compression.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission-Based Modeling of Fiber Tailings Cementation and Filling Body Dynamics and Damage Ontology

Zhang,

Song,

et al. 2023

Minerals

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Optimizing the mechanical characteristics of cemented tailings backfill (CTB) and quickly identifying its damage state under external loading, this study compares and prepares CTB specimens without fiber, doped with polypropylene fiber (PF), doped with glass fiber (BL), and doped with polypropylene and glass blended fiber (PB). Uniaxial compression and acoustic emission (AE) monitoring experiments are also conducted. Based on the cumulative energy of AE, the damage ontology model of CTB was developed. As shown by the study’s findings, adding various fibers can greatly enhance the filler body’s uniaxial compressive strength (UCS). BL has the greatest effect, followed by PB, while PFs have the least effect. Furthermore, the fibers primarily prevent the growth of crack extension by extending or breaking themselves, The results of the tests on acoustic emission revealed that the fiberless filler’s signals were more active prior to the peak point and less intense in the later stages of the damage, whereas the fiber-doped filler’s signals began to increase following the peak point and remained high. Thus, the damage model curves of various fiber-filled bodies are constructed based on the cumulative energy of acoustic emission, and the experimental data verification shows that the two have good consistency, suggesting that the established theoretical model can serve as a basis of reference for assessing the filled bodies’ damage state.

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Mechanical properties and damage evolution characteristics based on the acoustic emission of gangue and high-water-content materials based cemented paste backfill

Cited by 13 publications

References 14 publications

Study on Ultra-Long-Distance Transportable Concentration Gradient of Coal Gangue Slurry with Different Gradations

Study on Ultra-Long-Distance Transportable Concentration Gradient of Coal Gangue Slurry with Different Gradations

A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

Acoustic Emission-Based Modeling of Fiber Tailings Cementation and Filling Body Dynamics and Damage Ontology

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