Stiffness of gangue backfilling body in goaf and its influence mechanism on rock strata control and stress evolution in gangue backfill mining

Wu, Dongtao; Guo, Wei; Luo, Feng; Li, Meng; Wen, Peng

doi:10.1007/s11356-023-26509-0

Cited by 9 publications

(3 citation statements)

References 28 publications

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“…When the filling rate and filling step vary, there are large differences in the displacement of different rock formations 36 . Table 4 shows the maximum displacements measured by controlled experiments for 2 cm filling and mining step filling rate 85% (case 1), 2 cm filling and mining step filling rate 95% (case 2), 3 cm filling and mining step filling rate 85% (case 3), and 3 cm filling and mining step filling rate 95% (case 4).…”

Section: Simulation Tests Of Similar Materials For Paste Fillingmentioning

confidence: 99%

Similar simulation of overburden movement characteristics under paste filling mining conditions

Zhao

Jin

2023

Sci Rep

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The method of filling mining can solve the problem of surface subsidence caused by coal mining. Among them, it is crucial to study the mechanism of filler strength improvement timeliness and filler mining to control rock movement for filler mining. In this paper, by combining theoretical analysis and similar simulation experiments, compressive strength is used as the research parameter to conduct proportioning test research on paste filling similar materials such as coal gangue, fly ash, and cement. The results prove that the strengths of the test ratios can meet the strength design criteria and lay the foundation for the requirements of similar simulation experiments. In order to study the characteristics of overburden failure, stress and displacement in the process of filling mining, the key technical parameters of overburden movement are determined. Similar simulation experiments were conducted to study the movement and deformation of overburden rock and the displacement and stress distribution law of overburden rock in the coal mine under different filling rates and filling steps conditions. The results show that the filling rate and filling step are the keys to preventing the overlying rock from rupture and collapse, and the larger the filling rate is, the smaller the stress and displacement of the overburden; the larger the filling step is, the larger the displacement and stress change of the overburden, and vice versa. In addition, the displacement curve along the strike is basically an "arch" type distribution, and the stress variation trend is "large-small-large" with a "Z" type distribution. The research results are of great significance to guide the practice of filling mining and can provide the theoretical basis for its further promotion.

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Section: Simulation Tests Of Similar Materials For Paste Fillingmentioning

confidence: 99%

Similar simulation of overburden movement characteristics under paste filling mining conditions

Zhao

Jin

2023

Sci Rep

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show abstract

“…Fill mining, as a green mining technology, utilises coal gangue underground for filling in order to reduce problems such as difficulty in accumulating coal gangue on the surface and pollution of the environment, to improve the recovery rate of coal resources and to control surface subsidence 5 – 7 . In the process of filling and mining, the gangue pressure-bearing deformation characteristics of the quality and effect of filling and mining has a decisive impact, directly affecting the surface subsidence and roof control and other engineering problems, need to carry out in-depth research on its characteristics to ensure the safety of filling and mining operations 8 – 11 . In the current research, a large number of studies have been carried out on the compressive macroscopic deformation characteristics of crushed gangue, and its research mechanical behavior mainly includes expansion, stress–strain, densification and compression damage, etc.…”

Section: Introductionmentioning

confidence: 99%

Study on the macro–micro evolution of compaction characteristics of coal gangue with different grain sizes under side-limit compression conditions

Liu,

et al. 2024

Sci Rep

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Currently the main method of mine solid waste disposal and utilization is to apply gangue to underground filling. For the grading characteristics of coal gangue in the hollow zone in underground filling, the state of pressure and the mechanical properties of coal gangue filling materials under different particle sizes. In this paper, through laboratory tests and numerical simulations, the bearing characteristics and deformation damage of gangue are deeply investigated and analyzed from both macroscopic and microscopic perspectives. The results of the study show that when the axial pressure reaches a certain threshold, the strain increases accordingly with the increase in grain size. Under the axial pressure condition of 15MPa, the bearing capacity of gangue with different grain sizes under the lateral pressure of steel cylinder showed obvious positive correlation. In the software PFC3D simulation, as the particle size of gangue particles increases, it has a significant effect on the natural stacking porosity of the specimen, and gangue particles are more prone to force chain instability and failure. Mixed particle size gangue can significantly reduce the natural accumulation porosity of the specimen, thus improving its overall stability. Significant displacement triangles existed in the top and lateral directions of the B1 (0–5 mm), B2 (5–10 mm), and B5 (0–20 mm) specimens under the same circumferential pressure conditions. The results of the study are of great significance for further selection of reasonable gangue gradation and determination of its mechanical properties.

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“…Existing research mostly focuses on optimizing the lling process and compacting behavior of gangue, with less attention paid to the practical di culties exposed by on-site engineering. For example, the blockage behavior caused by the self weight of the gangue in the gangue storage warehouse, as well as the complexity of the lithology, make it di cult to strictly control the degree of gangue fragmentation [30][31][32]. The amount of gangue associated with coal mining often cannot meet the lling demand of goaf.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Grading Optimization and Storage Effect of Crushed Gangue for Backfill

Sun¹,

Zhu

et al. 2023

Preprint

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Coal mine backfilling mining controls the movement of overlying rock and surface subsidence by backfilling the fractured rock mass into the goaf. The compaction mechanical performance of the fractured rock is the key to the effectiveness of overlying rock control. 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. Through research on the physical properties of gangue and natural graded gangue compaction experiments, the porosity of gangue crushing and the process of gangue crushing are analyzed. It is shown that the gangue material has good load-bearing performance in terms of physical structure, and the elastic modulus has an absolute effect on the compression characteristics of gangue particles. Through storage analysis of the natural grading experiment phenomenon, it was found that the alarm height for gangue not to be blocked is 20m. Through laboratory experiments, the compression characteristics of group B samples were analyzed, and it was found that the particles showed a trend of first increasing and then decreasing under the coupling effect of particle size and particles of different sizes. Through the analysis of particle strain energy density and breakage energy, it is concluded that the strain energy density of the sample from high to low is B1, B2, B6, A5, B5, B4, and the breakage energy consumed to reach the sample broken state from low to high is A5, B6, B5, B4, B3, B2, B1, so the B6 group samples have the best economic benefits. Through analysis from the perspective of filling rate, it was found that the B6 group of samples has the best control effect on the overlying rock. Thus providing suggestions for optimizing the efficiency and effectiveness of backfill mining.

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Stiffness of gangue backfilling body in goaf and its influence mechanism on rock strata control and stress evolution in gangue backfill mining

Cited by 9 publications

References 28 publications

Similar simulation of overburden movement characteristics under paste filling mining conditions

Similar simulation of overburden movement characteristics under paste filling mining conditions

Study on the macro–micro evolution of compaction characteristics of coal gangue with different grain sizes under side-limit compression conditions

Experimental Investigation on the Grading Optimization and Storage Effect of Crushed Gangue for Backfill

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