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 …

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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Research on the properties of creep compaction of crushed gangue …

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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Morphological characterization of crushed coal gangue by micro …

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 …

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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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Investigations on mineralogical characteristics and feasibility of …

Coal is an important primary energy resource that plays a crucial role in the development of society and the economy 1.Coal gangue (CG) is a rock associated with coal during the formation process ...

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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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Study of the Internal Rebreaking Characteristics of Crushed Gangue …

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 role of gangue on the mitigation of mining-induced hazards …

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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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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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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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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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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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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Characterizations of macroscopic deformation and particle …

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.

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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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The role of gangue on the mitigation of mining-induced hazards …

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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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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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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Effects of particle size on compressive deformation …

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 similar compression …

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Influence of block shape on macroscopic deformation response and meso

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 ...

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Accurate measurement and quantitative analysis of 3D shape

The mechanical properties of the crushed gangue, such as compression deformation characteristics and seepage characteristics, are closely related to the 3D shape characteristics of gangue blocks. ... the role of phase/grain boundary in the static globularization of TC17 alloy was systematically studied by setting different α phase content ...

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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 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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Compaction characteristics and energy dissipation of crushed …

The compressive characteristics of crushed gangue with different particle sizes as shown in Fig. 5. The crushed gangue with a small particle diameter (0–10 mm) resists compressive deformation most effectively among the four particle gradations. Since the porosity of gangue increases with the …

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Experimental Investigation of the Compaction …

To study the compaction and re-crushing characteristics of the gangue particles, continuous grading and intermittent grading of two different structures were designed to study the bulk gangue particle size distribution.

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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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Experimental Study on Confined Compaction Deformation of Crushed Gangue

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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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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Particle Crushing and Morphology Evolution of Saturated Crushed Gangue

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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Particle Crushing and Morphology Evolution of Saturated …

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 …

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