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Compaction characteristics and energy dissipation of …

The compressive characteristics of crushed gangue with different particle sizes as shown in Fig. 5. The crushed gangue with a small particle diameter (0–10 mm) resists compressive deformation most …

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Study of the Internal Rebreaking Characteristics of Crushed …

The compaction of crushed gangue in the caved zone, and its influence on the overlying strata and surface movement, has significant impact on and plays an …

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Effect of particle size on re-crushing characteristics of crushed …

In 2018, Li analyzed the AE location events of crushed coal gangue using the AE positioning method, which is suitable for intact and unbroken media without any modifications [30]. By 2019 and 2021, Li and Feng [[31], [32]] first proposed an AE positioning method that is suitable for crushed particle media during compression and …

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Research on the properties of creep compaction of crushed gangue …

The crushed gangue samples were sieved with a graded sieve to obtain three single lithologies samples, sandstone, sandy mudstone, mudstone, sandstone-sandy mudstone (5:5, 7:3), mudstone-sandy mudstone (5:5, 7:3), and four combinations of lithologies with different ratios in the range of 15 to 25 mm particle size, respectively. (Fig 2).

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Experimental Study on Acoustic Emission of …

The crushed gangue materials which are filled into the goaf in solid-backfilling coal mining become the main body of bearing the overburden after the tamping process. Its resistance to deformation ...

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Microscopic fabric evolution and macroscopic deformation …

In the process of coal mining, the discharge of crushed gangue accounts for 15–20% of coal output. At present, the crushed gangue accumulated on the ground of …

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Mesoscopic influence mechanism of particle fragmentation …

The coal gangue was taken from Xin'an Coal Mine in Luoyang, Henan Province. The lithology of the gangue was sandstone, and the average density of the gangue was 1.369 × 10 3 kg/m 3, with an average uniaxial compressive strength of 38.03 MPa.To reduce the impact of boundary effects on the results (He et al., 2022), the larger …

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Experimental Study on Confined Compaction Deformation of Crushed Gangue …

the topic is original and it addresses the possibility of using crushed gangue in road engineering (via the study of water conditions influence on the crushed gangue). The obtained curves showing the influence of water content on crushed gangue under confining pressure are interesting for use as well was the relationship curves between …

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Characterization of the gas explosion under continuous …

The void ratio of coal gangue in Fig. 3 was measured by the drainage method, each set of experiments was repeated 3 times, and the void fraction was calculated based on the average of the experiments. The testing of coal gangue void fraction is shown in Fig. 4.The gangue collected in gob was crushed and sieved into selected size range …

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Effects of Water Immersion on the Long‐Term Bearing …

To study the long-term bearing characteristics of crushed gangue in goaf under water immersion conditions, the creep test of the crushed gangue in the water immersion state was performed by using the self-developed large-scale deformation-seepage test system of crushed rock. The effects of the rock lithology, axial stress, and …

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Stiffness of gangue backfilling body in goaf and its influence

To study the influence mechanism of gangue backfilling material (GBM) with different particle sizes on overburden deformation, the particle movement characteristics and the mechanism of stiffness difference with different particle sizes of GBM were analysed by physical compression and particle flow numerical simulations. Then, …

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Compressive deformation and energy dissipation of crushed …

Crushed gangue, an inhomogeneous and discontinuous medium, is accompanied with the absorption and dissipation of energy under compression. In order …

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Effects of particle size on compressive deformation …

Zhou et al. [8] conducted impact crushing experiments on single crushed gangue particles, and found that with the increase of particle size and impact velocity, the crushing ratio of gangue decreased. Liu et al. [9] and Ma et al. [10] conducted separate compaction seepage experiments on broken rock. They discovered that the evolution of ...

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Influence of block shape on macroscopic deformation response and meso

The accumulation of crushed gangue on the ground not only wastes a large number of land resources, but also causes a series of environmental problems such as soil pollution, surface vegetation damage, surface water and groundwater pollution. In a word, it poses a great threat to the ecological environment and human health in the mining area …

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Particle Crushing and Morphology Evolution of Saturated Crushed Gangue …

The main reasons for the compression of saturated crushed gangue were as follows: (1) Under the action of the axial loading, gangue particles overcame the frictional resistance between particles. This resulted in sliding and rolling to a more stable position; hence, it led to a reduction in the void volume. (2) Gangue particles were broken.

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Microscopic fabric evolution and macroscopic deformation …

Deviatoric stress–strain curves and overall deformation of crushed gangue under triaxial compression. The deviatoric stress–strain curve and overall deformation of crushed gangue under different confining pressures are shown in Figs. 1 and and2, 2, respectively.It can be concluded from the Figs. 1 and and2 2 that in the triaxial …

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Characterizations of macroscopic deformation and particle crushing …

In solid backfilling coal mining (SBCM), the deformation resistance of crushed gangue particle material (CGPM) is critical for controlling overburden strata movement and ground surface subsidence.In engineering practice, CGPM is generally circularly compacted first by the compaction machine to reduce its …

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Effects of Water Immersion on the Long‐Term Bearing …

To study the long-term bearing characteristics of crushed gangue in goaf under water immersion conditions, the creep test of the crushed gangue in the water immersion state was performed by using the self-developed large-scale deformation-seepage test system of crushed rock.

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Experimental Study on Confined Compaction Deformation of …

To study the deformation characteristics of crushed gangue under different water content conditions, the confined compaction test of crushed gangue was carried …

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Particle Crushing and Morphology Evolution of Saturated …

In this research, the deformation, particle crushing, and morphology evolution of saturated crushed gangue under variable axial stresses (0, 2, 4, 8, 12, 16, and 20 MPa) were …

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Deformation Behaviour of Crushed Waste Rock Under …

The crushed gangue specimens used in this study are collected from the gangue hill at Huayuan Coal Mine, Jining City, China. The gangue must be crushed before backfilling the underground space as a backfilling material. The crushed gangue with the particle size smaller than 50 mm is normally used for backfilling the mining goaf.

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Research on the bearing creep characteristics and …

The crushed gangue continues to fill the surrounding small voids, resulting in a further increase in gangue density and a gradual reduction in the magnitude of gangue compression deformation. The ...

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Study of the Internal Rebreaking Characteristics of Crushed Gangue …

The crushed gangue in the sample will come into local mutual touch when the amount of hard crushed gangue grows to a specific point. The formation of a stable crushed gangue skeleton between the crushed gangue under lateral compression conditions increases the compressive strength of the composite gangue sample.

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Influence of block shape on macroscopic deformation …

Crushed gangue models were made by gangue block containing single shape blocks or mixed-shape blocks. The influence of block shape on the macro …

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Study on the macro–micro evolution of compaction

The crushed gangue will be displaced laterally in the process of being compacted, and the wall of the cylinder will be subjected to a certain amount of lateral pressure due to the presence of the ...

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Mesoscopic influence mechanism of particle

Additionally, a lateral confined compression particle flow model for gangue was established, the meso-structural evolution law of gangue aggregates under triaxial compression under different gradation conditions was studied, and the influence mechanism of the internal microstructure of crushed gangue on its macroscopic deformation was revealed.

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Particle-Crushing Characteristics and Acoustic …

In solid backfilling coal mining (SBCM), the crushed gangue backfilling material (CGBM) is generally compacted circularly by a compaction machine in order to reduce its compressibility. In this cyclic …

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Experimental Investigation of the Compaction-Crushing

The compaction and re-crushing characteristics of crushed gangue are important factors which affect the quality and effectiveness of the filling of the quarry. To study the compaction and re-crushing characteristics of the gangue particles, continuous grading and intermittent grading of two different structures were designed to study the …

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Control effect of overburden grout injection on surface …

Fly ash can further reduce the porosity of crushed gangue, improve the flowability and cohesion of the filling material, and enhance the pumpability and impermeability of the mixture. Therefore, gangue particles can be used as grouting aggregate materials for coal seam mining, combined with loess and fly ash for OGI …