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 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 …
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Numerical simulation study on macroscopic mechanical …
The irregular shape of gangue blocks will affect the coordination structure between blocks in the crushed gangue accumulation body, and then affect the engineering mechanical properties of crushed … Expand. 3. PDF. Save.
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The distribution discipline of impact crushed on coal and gangue
The impacting crusher was used to impact crushing test on coal and gangue from three mining with different impact velocity.The distribution function of coal and gangue,the influence of the impact velocity and the hardness of coal and gangue on the distribution function were got from the data fitting of experimental results.The results show …
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Study on mechanical properties of coal gangue and fly ash
The coal fly ash concentration has a positive relationship with the acceleration factor. The permeability of crushed coal gangue follows a hierarchical distribution law and the permeability changes in the magnitude range of 10 –11 ~ 10 –9 m 2. The fractal dimension is inversely related to the permeability of crushed coal gangue.
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Experimental Investigation on the Grading
When measuring the breakage density of the crushed gangue body, plastic film is used to wrap the test material. In order to truly reflect the natural stacking state, the film is fully vibrated to shrink the space and make full contact between the gangue particles. A total of 10 samples were set up for measurement and analysis in the experiment.
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Effects of particle size of crushed gangue backfill materials …
In recent years, solid waste backfill mining has developed rapidly and widely used to control surface subsidence and reduce accumulation of solid waste. As crushed materials are used to backfill goafs, the particle size of backfill materials becomes a key factor influencing the control of surface subsidence. To analyse the influences of particle …
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Compaction characteristics and energy dissipation of crushed gangue …
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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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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Compaction characteristics and energy dissipation of …
The energy dissipation of the compaction test includes three parts: ① compaction deformation of crushed gangue (including gap closure, friction slip and extrusion failure between gangue particles), ② friction between gangue and chamber wall and ③ elastic deformation of the testing … See more
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Study on the macro–micro evolution of compaction
crushed gangue, and its research mechanical behavior mainly includes expansion, stress–strain, densication and compression damage, etc. At the same time, the inuence of factors such as material ...
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(PDF) Effects of Water Immersion on the Long-Term Bearing
Abstract and Figures. 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 ...
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Effects of particle size of crushed gangue backfill …
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 Pingdingshan mining area, China, was selected as a case study.
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Particle size distribution of coal and gangue after
The coal and gangue will be put on the hardness plate to crush, the gangue with high hardness will keep the original shape, and the coal with lower hardness will be crushed and then screened [29 ...
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Compressive deformation and energy dissipation of crushed coal gangue
Abstract. 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 ...
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Influence of block shape on macroscopic deformation …
@article{Li2021InfluenceOB, title={Influence of block shape on macroscopic deformation response and meso-fabric evolution of crushed gangue under the triaxial compression}, author={Junmeng Li and Yanli Huang and Hai Pu and Gao Huadong and Yingshun Li and Shenyang Ouyang and Guo Yachao}, journal={Powder Technology}, year={2021}, …
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(PDF) 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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Effects of particle size of crushed gangue backfill materials …
The crushed coal gangue particles are widely used in solid backfilling. However, the non-uniform compaction and internal re-crushing behavior of crushed coal gangue under bearing-stress have not ...
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Experimental Study on Confined Compaction …
To study the deformation characteristics of crushed gangue under different water content conditions, the confined compaction test of crushed gangue was carried out under five different water content …
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Study on the macro–micro evolution of compaction
In the current research, a large number of studies have been carried out on the compressive macroscopic deformation characteristics of crushed gangue, and its …
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Mechanical and Acoustic Emission Behavior of Gangue …
At first, the crushed gangue was screened and classified as four groups, which have particle sizes of 0–2.5 mm, 2.5–5 mm, 5–10 mm, and 10–15 mm, respectively. ... Limited by the experimental purpose, only part of AE monitoring was used in this study. Open in a separate window. Figure 5. Schematic diagram of the AE measurement: 1 ...
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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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Characterizations of macroscopic deformation and particle …
For the sample preparation, CGPM was firstly crushed and then screened by a classification screen to the particle size distribution for 10–20 mm, 20–30 mm, 30–40 mm, 40–50 mm, 50–60 mm, as shown in Fig. 2. When preparing the samples, the weight of gangue in each particle size range was 3.2 kg, and the mass ratios was 1:1:1:1:1.
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Characterizations of macroscopic deformation and particle …
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 …
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(PDF) Microscopic fabric evolution and macroscopic
The results show that: (1) the bearing capacity of crushed gangue materials increases with the increase of confining pressure; (2) the block aggregate in the gangue sample is gradually compacted ...
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Fractal characteristics of crushed particles of coal gangue …
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 …
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Morphological characterization of crushed coal gangue …
In the present work, the impact crushing tests were conducted to obtain the effects of sizes, gangue mixture ratios, and crushing velocities on the fractal characteristics of the crushed PSD characteristics, using an in-house designed device.
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Characterizations of macroscopic deformation and
The stability of the gangue rib and the movement of the overlying strata are significantly influenced by the compressive deformation characteristics of crushed stones. In this research, a large gangue rib similar compression device was designed to perform compression tests on gravel of different particle sizes.
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Compaction characteristics and energy dissipation of …
were applied to conduct compaction experiments of gangue with dierent particle sizes, axial stresses, loading rates decided by actual mining stress in goaf. The …
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Sustainability | Free Full-Text | Experimental Study on …
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 is the key to control overburden movement and surface subsidence. Particle breakage affects the resistance to deformation of filling …
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Fractal characteristics of crushed particles of coal gangue …
Fractal dimension of each crushed specimen ranged from 0.352 to 2.654, with increase of stress, the particle size of each specimen tended to be distributed in a more dispersed fashion. Meanwhile ...
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