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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 …
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. ... The role of the lateral stress is to create a compact ...
China's total coal production in 2021 exceeded 4.13 billion tons, 52% of the world's total. Coal gangue, a solid waste of coal mining accounts for 15–20% of coal production, when directly discharged on the ground surface as waste heaps, it occupies large areas of land and cause environmental pollution. This paper summarizes the …
1. Introduction. Gangue backfilling coal mining is a green mining technology aimed at the problems of "three-unders:" coal under buildings, under water and under railway and gangue accumulations [1, 2].The compaction characteristics of gangue filling materials play a decisive role in the effect and quality of filling mining [[3], [4], [5], …
DOI: 10.1016/j.powtec.2022.117675 Corpus ID: 250064041; Effect of particle size on re-crushing characteristics of crushed coal during axial loading @article{Guorui2022EffectOP, title={Effect of particle size on re-crushing characteristics of crushed coal during axial loading}, author={Feng Guorui and Fan Zhilong and Li Zhen and Qi Tingye and Zhao …
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 …
The reason for this outcome is that, after mixing small-particle-size gangue with large-particle-size gangue, the presence of small particles increases the coordination number of the large particles and decreases the amount of large particles that are crushed. The large-grain-size gangue plays the role of skeletal support, while the small-grain ...
The permeability of crushed coal bodies plays a bottom neck role in seepage processes, which significantly limits the coal resource utilisation. ... 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 ...
In addition to the need of coal gangue to be crushed, the other production process is basically the same as that of clay bricks. ... Coal gangue sand barrier plays a significant role in sandy soils improvement, and it promotes the great increase of soil organic matter, nutrient elements such as N, P, K, soil moisture content and the change …
the crushed gangue accumulated on the ground of mining areas in China has exceeded 6 billion tons, becoming ... mation characteristics play a decisive role in the rmness and …
In automatically formed gob-side entry retaining techniques, one side of the retaining roadway consists of the gangue rib structure. 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 …
The irregular shape of gangue blocks will affect the coordination structure between blocks in the crushed gangue accumulation body, and then affect the …
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 ...
As a result, the compression deformation characteristics of crushed gangue are significantly affected. In this paper, by using the method in literature 34 and through the secondary development of ...
Direct floatation technique – In this method, the mineral sticks to the air bubble, and the remaining gangue settles down at the bottom. 2. Reverse floatation technique – In this method, the gangue sticks to the air bubble and ore particles settle down in the bottom. Also Read: Metallurgy. Basic Principle of Froth Flotation Process
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 permeability of crushed coal gangue follows a hierarchical distribu-tion 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. The experimental results show that the coal gangue will be further crushed and
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 …
Due to the sharp edges and corners, concave-convex undulations and poor regularity of gangue blocks, the coordination structure of crushed gangue materials is influenced and the occlusive effect ...
Due to the crushing and swelling characteristics of BCR in the caving zone, it plays a buffering role in roof pressure, and is also the main medium for transmitting roof pressure to the floor, ... used a 2600 × 1400 × 1600 mm simulation device to conduct loading and unloading experiments on crushed gangue in goaf. But it is difficult for such ...
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.
In 2021, China's coal consumption accounted for about 56% of primary energy consumption, and the proportion of coal consumption in China will still play a leading role for a considerable period ...
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.
The deformation and re-crushing characteristics of different lithological caving crushed gangues in mine goaf directly affect the overburden strata movement, which significantly affects the surface subsidence of mining goaf. The effect of particle size on the re-crushing characteristics of different lithological caving crushed gangues in …
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 …
The crushed coal gangue particles are widely used in solid backfilling. However, the nonuniform compaction and internal re-crushing behavior of crushed coal gangue under bearing stress have not yet been revealed in current research. But this is particularly significant for improving the filling effect and quality. In this article, with the aid of 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 …
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 …
Crushed gangue, an inhomogeneous and discontinuous medium, is accompanied with the absorption and dissipation of energy under compression. ... The strain energy released in rock volume plays the ...
1. Introduction. An increasing number of mining gobs are formed as underground coal resources continue to be mined [1].Caved, fractured, continuous bending, and soil zones may be identified in response to longwall mining [2, 3].Caved zones have been identified as porous media comprising crushed rock and coal of different particle …
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 ...