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Compressive deformation and energy dissipation of crushed coal gangue
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 ...
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Experimental Investigation of the Compaction-Crushing …
Graded crushed gangue, in the compaction process, will be accompanied by the ... the smaller particles assume the skeletal role, and a series of complex effects of rupture, crushing, and grinding ...
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Influence of block shape on macroscopic deformation response and meso
The research process includes CT scanning test of the external contour of the randomly selected gangue block, reconstruction of 3D model of real shape of gangue block, acquisition and classification of 3D shape parameters of gangue block, construction of particle flow numerical model of crushed gangue with different block shapes under the triaxial …
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Experimental Investigation on the Grading Optimization and …
Experimental Investigation on the Grading Optimization and Storage Effect of Crushed Gangue for Backfill. Kai Sun, Lei Zhu, Jian Li, Shanjun Tian, Zhiqiang Yang, Zhicheng Liu, and 1 more. ... It is proposed that the elastic modulus plays a decisive role in the compression characteristics of gangue particles. (2) According to the specific ...
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Mesoscopic fabric evolution and macro deformation response of crushed
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 6 billion tons, becoming the largest industrial solid waste in China 1–3.The accumulation of crushed gangue on the ground causes a series of environmental …
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Prediction of compression and deformation behaviours of gangue …
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, …
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Experimental Study on Acoustic Emission of Confined …
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 …
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Experimental Investigation on the Grading Optimization and …
In order to optimize the control effect of crushed gangue overlying rock, this article focuses on the regulating effect of gangue particle size grading on mechanical properties.
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Experimental Study on Confined Compaction Deformation of Crushed Gangue
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 ...
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Morphological characterization of crushed coal gangue by micro …
Read Morphological characterization of crushed coal gangue by micro X-ray computed tomography scanning. ... However, the scanning and analysis parameters play a significant role in the accuracy of the porosity value determined from CT scan. This paper presents details of an investigation carried out to understand the effect of system parameters ...
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Study of the Internal Rebreaking Characteristics of Crushed Gangue …
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 mine goaf is investigated in …
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Experimental Study on Acoustic Emission of Confined …
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.
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crushed gangue role
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. WhatsApp: +86 ...
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Compression characteristics of filling gangue and simulation of …
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 ...
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(PDF) Experimental Investigation of the Compaction-Crushing
The compaction and re-crushing characteristics of crushed gangue are important factors which affect the quality and effectiveness of the filling of the quarry.
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The role of gangue on the mitigation of mining-induced hazards …
Granular gangues should be crushed into fine particles and dehydrated before backfilling. Gangue, produced from coal mining and washing process, is a serious threat to the …
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Grain size and shape fractal characteristics of gangue in the …
During the jaw crushing stage, the particle size fractal dimension increases with the width of the discharge opening, ranging from 1.85 to 1.92. The value of the shape fractal dimension varies …
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Layered re-breaking behavior of gangue backfilling materials and
Consequently, gangue waste piles have become one of the main sources of environmental pollution [8], [9]. To improve the mining environment and safety, gangue backfilling is widely applied [10], [11]. As a primary type of backfilling material, broken coal gangue is gradually compacted by overlying strata when backfilled into the mining goaf.
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Macroscopic and microscopic study on the compression bearing
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], [6]].
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Study of the Internal Rebreaking Characteristics of Crushed …
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
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Study on mechanical properties of coal gangue and fly ash
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
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(PDF) Effects of Water Immersion on the Long-Term Bearing
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 ...
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Effects of Water Immersion on the Long-Term Bearing
Experimental Study on Confined Compaction Deformation of …
Keywords: crushed gangue; confined compaction; deformation law; particle crushing; relative crushing rate 1. Introduction Coal gangue is the solid waste generated during the mining and washing of ...
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Influences of water filling timing on the deformation mechanism of
Quantitative assessment reveals that early water filling induces rapid gangue deformation, primarily during loading stages, while later water filling stages exhibit a …
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Compaction characteristics and energy dissipation of …
The stress–strain relationship of crushed gangue in the compaction process increases exponentially and can be divided into void compaction stage, structure adjustment stage and …
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OPEN Microscopic fabric evolution and macroscopic …
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 stability of various ...
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Macroscopic and microscopic study on the compression bearing
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], [6]].Nan Zhou et al. used a SANS testing machine and …
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Iron-modified coal gangue/rice husk biochar composites for …
Addressing the severe arsenic pollution issue in coal mining areas is crucial for environmental protection and human health. Adhering to the principles of a circular economy, we have innovatively employed ball milling technology to successfully develop a pioneering composite material of iron-modified coal gangue (CG-Fe) and rice husk (RH) biochar, which holds …
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Innovative Cut-and-Fill Mining Method for Controlled Surface
Regarding the results of previous rock mechanics tests and crushed-gangue compression tests, ... The rock layer's load-bearing capacity is stronger, reflecting the load-bearing role of the critical layer. Figure 5 reveals that after the cut-and-fill mining equilibrium, the stress distribution along the Y = 120 m × Z = 78 m monitoring line ...
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