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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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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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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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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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 …
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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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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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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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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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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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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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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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The crushed gangue samples were sieved with a graded sieve to obtain three single lithologies samples, sandstone, sandy mudstone, mudstone, sandstone-sandy mudstone (5:5, 7:3), mudstone-sandy mudstone (5:5, 7:3), and four combinations of lithologies with different ratios in the range of 15 to 25 mm particle size, respectively. (Fig 2).
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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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The crushed coal gangue particles are widely used in solid backfilling. ... The role of gangue on the mitigation of mining-induced hazards and environmental pollution: An experimental investigation. D. Ma Hongyu Duan Jiang-feng Liu Xibing Li Zilong Zhou. Environmental Science, Engineering.
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Li et al. (2017) monitored the stress-strain relationship of crushed gangue and concluded that quite a portion of crushing energy is released during the compaction process. ... This study aims to investigate the role of gangue on the mitigation of mining-induced hazards and environmental pollution by GBM method. To carry out the research ...
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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 investigated by ...
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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 dissipation of gangue in the loading process under conditions of different particle sizes, loading rates, and first-time stress loads, a SANS testing …
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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 for …
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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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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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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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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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The crushed particle size came from the complete caved zone gangue in the longwall goaf of a mine. The maximum thickness of the caved zone was about 20 m, and the
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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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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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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 compaction device. The strain–stress relationship in the compaction process of crushed gangue and the …
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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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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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In this study, coal gangue from a mining area in Guizhou was selected, and according to the successful filling of hollow areas and a previous exploration test, the gangue was crushed and sieved to particles of less than 5 mm granularity; these were further subdivided into granularities of 0–1 mm (density of 2.65 g/cm³), 1–3 mm (density of 2.58 g/cm³), and 3–5 mm …
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