The effects of high temperature on the compaction behaviour of waste rock backfill materials in deep coal mines

Meng, Guohao; Li, Meng; Wu, Zhongya; Ma, Haobin; Wang, Yuyao

doi:10.1007/s10064-019-01603-1

Cited by 10 publications

(3 citation statements)

References 25 publications

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“…Researchers combined coal gangue's physical and chemical properties in the research of coal mine solid waste resource utilization. They carried out the mechanical properties of coal gangue-filled materials under high-temperature conditions to analyze the changes of material stress, strain, and porosity with temperature and then derived the influence law of temperature on material deformation mechanism [21,22]. In the use of microbial technology to improve the performance of coal gangue-filling materials, researchers conducted a study on microbial-induced calcium carbonate precipitation (MICP) solidification of coal gangue-filling materials.…”

Section: Introductionmentioning

confidence: 99%

Study on Solidification Characteristics of Granular Coal Gangue: Fine Sand Paste-Cemented Filling Materials

Deng,

Wang,

Cao

et al. 2023

Advances in Civil Engineering

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Three groups of filling materials with different mix proportions were prepared. PO42.5 grade cement was selected as the binding material, mechanized granular coal gangue and fine sand were used as the filling aggregate, and then the specimens were curing at room temperature and 95% moisture. Through the uniaxial compression test, the influence of gangue–sand ratio, the mass fraction, and curing age on the mechanical properties of filling materials was analyzed. The microstructure analysis of SEM was conducted to explore the internal mechanism of the strength difference of filling materials. The results show that the gangue–sand ratio dramatically influences the uniaxial compressive strength. The strength increases first and then decreases with the gangue–sand ratio increase. The mass fraction of filling paste is positively correlated with specimen strength. When the sand–cement ratio, gangue–sand ratio, and the mass fraction remain unchanged, the longer the curing age, the greater the uniaxial compressive strength of specimens. The specimens with a sand–cement ratio of 3.5 : 1, a gangue–sand ratio of 5 : 5, and a mass fraction of 86% reach the maximum value of 11.03 MPa at a curing age of 10 days. It can be seen that when the gangue–sand ratio is 5 : 5, the filling material has the best mechanical properties, so it can be recommended as the optimal mix proportion for goaf filling. Thus, it provides a solid technical guarantee for the treatment of mine surface collapse disasters and the utilization of bulk coal gangue resources.

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Section: Introductionmentioning

confidence: 99%

Study on Solidification Characteristics of Granular Coal Gangue: Fine Sand Paste-Cemented Filling Materials

Deng,

Wang,

Cao

et al. 2023

Advances in Civil Engineering

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“…The strength and mechanical properties of the backfill are closely related to the backfill material, cementitious material, lime-sand ratio, curing conditions, and other factors (Guo et al 2022;Meng et al 2019;Wu et al 2021b). conducted uniaxial compression tests on cemented tailings backfills with different cement-sand ratios and waste rock content, the mechanical stability and failure modes is analyzed, and discussed the effects of cement-sand ratio and waste rock content on the mechanical stability of backfill specimens.…”

Section: Introductionmentioning

confidence: 99%

Deformation failure and acoustic emission characteristics of continuous graded waste rock cemented backfill under uniaxial compression

Guan

Yao

et al. 2022

Environ Sci Pollut Res

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In order to study the effect of aggregate particle size on damage and failure of cemented backfill, uniaxial compression tests were carried out on waste rock cemented backfill with different Talbol particle size gradations using YZW-30A rock direct shearing instrument. The characteristic parameters of acoustic emission (AE) of the specimens during loading process were monitored, and the damage evolution and failure mode of waste rock cemented backfill with different particle size gradations were discussed. The results show that：With the increase of Talbol particle size gradation index n, the uniaxial compressive strength of backfill body first increased and then decreased, and the failure mode of backfill body gradually changed from shear failure to tensile failure. The cracks on the surface of specimens are more and damage is more serious with the increase of the gradation index n. With the increase of the Talbol gradation index n, AE energy rate is more active, and the cumulative AE energy rate is higher. The AE energy rate increases rapidly in the plastic development stage, and reaches maximum value before and after the peak stress, which can be used as the precursor to judge the failure of waste rock cemented backfill. According to the test results, the damage model and constitutive equations of waste rock cemented backfill with different Talbol particle size gradations are established, which can provide engineering guidance for filling mined-out areas with waste rock to ensure safe production of mines.

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“…Along with the high-intensity mining of the coal resources, the shallow coal resources in Eastern China are on the verge of depletion. Currently, the depth of coal mines is extending at an annual rate of 10-25 m [7][8][9][10]. The high-intensity mining of coal resources is inevitably accompanied by the production of a large amount of solid waste.…”

Section: Introductionmentioning

confidence: 99%

Effect of Doped Glass Fibers on Tensile and Shear Strengths and Microstructure of the Modified Shotcrete Material: An Experimental Study and a Simplified 2D Model

et al. 2021

Self Cite

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Shotcrete material has found extensive applications as a reinforcing material in the engineering sector. This study examined the effect of doped glass fibers on the mechanical performance of the modified shotcrete material composed of aeolian sand, fly ash, cement, quicklime, and doped glass fibers. Its tensile and shear strengths values were experimentally determined via a WAW-1000D computerized hydraulic universal tensile testing machine. Its microstructure was analyzed via a size analyzer, scanning electron microscope (SEM), and X-ray diffractometer (XRD). A 2D simplified mechanical model was elaborated to reflect the influence mechanism of the doped glass fibers on the mechanical performance of the modified shotcrete material. The experimental and mechanical analysis results indicated that, at the macroscopic scale, the experimental tensile and shear strengths of the shotcrete material doped with glass fibers were significantly higher than those of the undoped shotcrete material (by up to 310% and 596%, respectively). These results were in concert with the proposed model predictions, where the compound stresses in the shotcrete material were derived as the sum of the stress borne by the shotcrete material itself and the bridging stress exerted by the glass fibers. At the microscopic scale, SEM observations also revealed that the glass fibers were intertwined with each other and tightly enveloped by the shotcrete material particles within the modified shotcrete specimens, connecting the particles of different components into a whole and improving the overall mechanical strength. In addition, the relationships of the compound stress of the shotcrete material vs. embedment length, embedment angle, and cross-sectional area of the glass fibers were established. The research findings are considered instrumental in clarifying the mechanism by which the glass fibers influence the mechanical performance of shotcrete materials and optimize their solid waste (fly ash and quicklime) utilization.

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The effects of high temperature on the compaction behaviour of waste rock backfill materials in deep coal mines

Cited by 10 publications

References 25 publications

Study on Solidification Characteristics of Granular Coal Gangue: Fine Sand Paste-Cemented Filling Materials

Study on Solidification Characteristics of Granular Coal Gangue: Fine Sand Paste-Cemented Filling Materials

Deformation failure and acoustic emission characteristics of continuous graded waste rock cemented backfill under uniaxial compression

Effect of Doped Glass Fibers on Tensile and Shear Strengths and Microstructure of the Modified Shotcrete Material: An Experimental Study and a Simplified 2D Model

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