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No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
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 ...
Coal gangue is a solid waste associated with the production process of coal mines, and each ton of coal can be accompanied by 0.15 to 0.2 tons of coal gangue. ... In order to optimise the control effect of crushed gangue overlying rock, this article focuses on the regulating effect of gangue particle size grading on mechanical properties ...
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 …
In order to investigate the effect of different water filling times on the compression deformation of filled gangue, a large-scale crushed gangue deformation testing system was …
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
In this research, by testing the compaction properties of crushed gangue backfill materials (CGBM) with different particle sizes, a method of simulating of CGBM was proposed …
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 ...
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 ...
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.
The permeability of crushed coal gangue follows a hierarchical distribution law and the permeability changes in the magnitude range of 10–11 ~ 10–9 m2. The fractal dimension is inversely related to the permeability of crushed coal gangue. The experimental results show that the coal gangue will be further crushed and that adding a certain ...
The research results will enrich the theoretical basis for crushed gangue compaction and further improves the control effect of stratum movement using gangue backfill mining method.
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, combined with a similar material …
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 …
To study the re-crushing characteristics of graded crushed gangue, the use of self-designed crushed rock axial compression test system, from the gangue re-crushing particle …
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 ...
Filling of gangue formed in coal mining is an effective means to realize green mining in coal mine. The key of gangue filling mining is to accurately understand the breaking mechanism and pore evolution of gangue under load. Therefore, in this paper, firstly, the yield criterion of granular materials based on radius of curvature and contact stress is built, which …
The change rules of crushing ratio and newly added fine particle content with the cyclic loading times were similar. This is due to that the crushing forms of the gangue block in CGPM samples are mainly edges fracture and corners fracture. In this two crushing forms, gangue blocks in CGPM are mostly crushed into fine particles (0–10 mm).
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 of compacted and crushed gangue based on fractal theory and particle size distribution information. To investigate the fractal characteristics of compacted gangue, compaction experiments were …
ABSTRACT To accurately estimate the separation effects and breakage characteristics of coal and gangue particles (CGPs), it is of great significance to understand the meso-morphologies of CGPs and their correlations with different crushing conditions. In the present work, the impact crushing tests were conducted to obtain the effects of sizes, gangue mixture ratios, and …
Based on the analysis of the crushed gangue deformation at different water filling stages, the effects of cumulative crushing in the upper layer and concentrated filling in the lower layer can be observed, as shown in Figs. 9 (b) and 11. Due to the decrease in stress exerted by the loading head on the crushed gangue with increasing depth, the ...
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 materials. In this paper, a confined …
Regulating the density of the dry crushed filling material is crucial for ensuring the stability of the gob, providing a fundamental basis for investigating overburden and surface …
Graded crushed gangue, in the compaction process, will be accompanied by the re-crushing of the particles, and the re-crushing of the particles will, in turn, affect its
To solve such environmental problems caused by coal mining, some scholars in China have proposed an integrated technology involving fully mechanised solid backfill mining, …
This study reveals the internal mechanism of macro deformation of crushed gangue under the triaxial compression from the perspective of the mesoscopic fabric evolution.
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 ...
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
DOI: 10.1016/j.cscm.2024.e03263 Corpus ID: 269732422; Influences of water filling timing on the deformation mechanism of crushed gangue in goaf @article{Lu2024InfluencesOW, title={Influences of water filling timing on the deformation mechanism of crushed gangue in goaf}, author={Yao Lu and Wei Lu and Changxiang Wang and Zhiqiang Wang and Baoliang Zhang …
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 … Expand. 17 [PDF] Save.
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 mining areas in China has exceeded ...
