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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 conditions by using a universal material testing machine and a …
Good plasticity: After the coal gangue is crushed and sand made, it can be made into finished sand products of different specifications, with uniform particle size and strong plasticity. 3. Controllable fineness modulus: A fineness modulus of natural sand has multiple gradations, and it is fixed and cannot be controlled manually, but the ...
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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. 16 [PDF] Save.
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.
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 gangue collected in gob was crushed and sieved into selected size range (35–45 mm). Subsequently, the gangue was immersed and cleaned respectively (for 10 min). Then, the coal gangue with the same size was loaded into a 0.3 *0.3 *0.3 m mesh cage (see Fig. 5 for the method of placing the coal gangue), which was taken as the total volume (V ...
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 important part …
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 sizes [4].As the working …
The invention relates to the technical field of coal gangue treatment, in particular to a device for treating coal gangue and a using method thereof, which comprises a treatment shell and a supporting plate, a supporting plate is arranged on the right side of the processing shell, a control cabinet is fixedly connected with the right end of the supporting plate, the inner side of the top …
First, the massive coal gangue was crushed with a sledgehammer and a jaw crusher, and then the coal gangue was manually screened and the coal gangue with 5∼20 mm was used as CCA and the coal gangue with less than 5 mm was used as CCGP. ... Use a ball mill to deal with coal gangue below 5 mm and set different ball milling times as 0, 15 min ...
To analyse the influences of particle size of backfill materials on surface subsidence, the compaction properties of crushed gangue backfill materials (CGBM) with different particle sizes were tested by using the YAS5000 testing machine and a self-made compacting device. Moreover, based on the strain hardening behaviour of CGBM in the …
What crushed gangue grinder good idmeknit which gangue crusher should be used laxmirubber the coal gangue crushed by the coal supply crusher x x gangue widely used for the production of a good ro our company is a hammer mill tub grinder get price . Details; Belgaum Raymond Milling Machine Processing Coal Gangue.
The coal gangue sand in this paper is the sand obtained after crushing the above coal gangue with a hammer crusher, ... Large, natural crushed stone should not use crushed stone with a larger average particle size than coal gangue, and should use "rice stone" (0 ~ 5 mm crushed stone) that can hold the coarse aggregate of coal …
One of the typical deep mining areas in China is the West Yu mining area. The majority of the deep mining and hollowing areas in this area face serious challenges in controlling surface subsidence and protecting structures due to the conflict between surface subsidence and tense land use for ground engineering and construction. The long-term performance of the shattered …
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 ...
Then, based on the real shape of the gangue block, a continuous–discrete coupled numerical model of crushed gangue by using the FLAC/PFC software under the triaxial …
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 …
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
The specimens were prepared in the laboratory according to the following procedure. The gangue block was initially crushed, and the particles were separated into several groups with diameter …
for crushed gangue in a deep longwall mining area's caved zone. The study's ndings offer theoretical direction for the movement of the mining zone's surface and the underlying gangue layer, as ...
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Gangue as a backfilling material is compressed gradually by the overburden strata, and the gangue blocks are crushed. The occlusion between the gangue blocks can prevent the slippage and rotation of the gangue blocks and hence has influence on the compressive deformation of the gangue backfilling material [ 23, 24 ].
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 relative ...
Coal gangue crusher,coal gangue processing equipment.The first step: coarse crushing.Large coal gangue by silo by vibrating feeder and uniform feeding,conveying to the jaw crusher of coarse crushing,sieving coal gangue were crushed after vibration sieveCoal Gangue Crushing and ScreeningAfter the ...
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 …
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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 pressure due to the presence of the steel cylinder, which restricts the displacement of the gangue. From the above gangue compression stress–strain curve analysis, it can be seen that ...
[Show full abstract] the compaction properties of crushed gangue backfill materials (CGBM) with different particle sizes were tested by using the YAS5000 testing machine and a self-made compacting ...