Crushed Gangue

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 gangue particles were crushed …

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).

Crushed gangue models were made by gangue block containing single shape blocks or mixed-shape blocks. The influence of block shape on the macro deformation response and meso-fabric evolution of crushed gangue under triaxial compression was studied. The main conclusions are as follows: Li et al. (2020a) [1] the more irregular the block shape ...

An equation for predicting stress-strain relationship during compression-induced deformation of gangue backfill materials under multi-factor coupling effects was established and shows that this equation can predict compression- induced deformation in goaf, beneficial to providing a basis for predicting strata movement and surface subsidence and guidance for …

crushed gangue under di erent loading rates was designed, and the acoustic emission (AE) signal was monitored in the process of confined compression. The test results showed that with the increase

The explosion scene in gob was simplified and the position of the crushed gangue from the ignition source was set to 0.5 m, the actual setup is shown in Fig. 3.The gangue used in the experiments ...

The numerical model of FLAC/PFC continuous-discrete coupled particle flow for crushed gangues under the triaxial compression was established. Crushed gangue models …

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 compression process of crushed …

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

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 crushed gangue is backfilled into underground goaf, which not only inhibits mining-induced subsidence but also reduces accumulation of waste on the ground: however, the effects of backfilling with gangue backfill materials in goaf are affected by a combination of multiple factors. To predict compression-induced deformation (CID) of gangue ...

An interaction model of the crushed gangue and the rock pillar in the gob during the bearing process was established, yielding the relationship between the deformation modulus of the two. This has ...

crushed gangue backfill materials (CGBM) with different particle sizes, a method of simulating of CGBM was pro-posed to study the influences of particle sizes of CGBM on surface subsidence. Study site The No. 12 coal mine, Pingmei Group, which is located in

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 …

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 selected crushed ...

The effect of particle size on the re-crushing characteristics of different lithological caving crushed gangues in mine goaf is investigated in this study based on an innovative compression–AE (acoustic emission) measuring …

Compaction properties of the backfill body are the key to reveal the law of roof subsidence and illustrate the mechanism of ground pressure control with gangue backfill mining.

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 ...

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 ...

dissipation of crushed gangue under actual mining stress. Authors consider the actual mining stress state in goaf to design the experiments depending on the background of gangue backll in the Renjiazhuang Coal Mine. The energy dissipation of crushed gangue was also analyzed, because gangue backfill controls the dynamic pressure through the

The particle size gradation of the two gangue specimens exhibited fractal characteristics after manual crushed, and the fractal dimension of each crushed specimen ranged from 0.352 to 2.654. (2) Regarding sandstone and sandy mudstone, the fractal dimension D of specimens with particle sizes from 20 to 31.5 mm and 31.5 to 50 mm rose quickly at ...

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 strain–stress relationship in the compaction process of crushed gangue and the crushing law of gangue particles were obtained through the test, and the effects of the axial stress, water ...

The compaction and re-crushing characteristics of crushed gangue are important factors which affect the quality and effectiveness of the filling of the quarry.

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 [[5 ...

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 ...

mixed particle sizes are rare, while studies on crushed gangue in goaf are mostly com-posed of gangue formed after two or more kinds of crushed lithology. The research on AE characteristics mainly focuses on the topic of crushed coal rock, with studies on combined lithology crushed rocks in goaf being less common. The evolution law of the micro and

Three stages of compressive deformation for crushed gangue is found. • The energy density of crushed gangue increases nonlinearly as the strain increases. • The …

The following conclusions were obtained, (1) the axial displacement increment and fractal dimension of the graded crushed gangue are closely related to the graded structure of the skeletal ...

The surface morphology of compacted and crushed gangue presents self-similarity and other fractal characteristics. This research constructed a fractal model for the particle size …