Optimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam

Fu, Qiang; Yang, Ke; Liu, Qinjie; Liu, Shuai; He, Xiang; Lyu, Xin

doi:10.1155/2021/2749373

Cited by 4 publications

(1 citation statement)

References 29 publications

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“…China produces huge amounts of coal (Fu et al, 2021). The associated high-intensity longwall mining has resulted in numerous irregular blocks and residual coal pillars being left behind over the years of operation (Zhang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Research on cemented artificial pillars to replace protective inter-block coal pillars and stope failure laws

et al. 2023

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Replacing protective inter-block coal pillars (PICPs) with cemented artificial pillars is proposed here to address low coal recovery rates. The use of cemented artificial pillars also reduces resource waste when PICPs are used in the short-wall block mining (SBM) process. A coal mine test area in northern Shaanxi, China, was employed as the study site. Artificial pillar replacement techniques were developed based on the layout characteristics of a typical SBM workface. High-strength cemented backfill materials for artificial pillars were manufactured using innovative material ratio testing, and the optimum ratios for backfill materials are discussed. A cusp catastrophe model of an artificial pillar was then developed and used to deduce the conditions and critical widths necessary to generate catastrophic instability of an artificial pillar. This theoretical analysis was validated using FLAC3D simulations. Using the test site conditions, the simulations revealed that when an artificial pillar had a width of 14 m, the destruction of the pillar and associated stope was gradual and would not cause catastrophic instability. Field monitoring performed at the test site verified the theoretical analysis and numerical simulation results, confirming that it was feasible to replace PICPs with cemented artificial pillars.

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Section: Introductionmentioning

confidence: 99%

Research on cemented artificial pillars to replace protective inter-block coal pillars and stope failure laws

et al. 2023

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Study on the influence of unloading disturbance of initial load stress on the microstructure and thermodynamic behavior of granular coal

Niu,

Sun,

Sun

et al. 2024

Asia-Pacific J Chem Eng

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With the advancement of coal mining, the pre‐mining stress on the coal seam increases. After mining, the coal seam fractures and unloads, leaving granular coal in the goaf with a high risk of spontaneous combustion. To investigate the oxidation behavior and underlying mechanisms of granular coal in goafs at various depths, fresh coal was subjected to static stresses ranging from 4 to 16 MPa and then underwent unloading treatment to generate granular coal with varying initial stresses. Subsequently, simulations of granular coal in goafs at various depths were conducted. Structural characteristics (pores and functional groups) and oxidation heat production performance of the granular coal after unloading were analyzed using a low‐temperature nitrogen adsorption instrument, a Fourier infrared spectrometer, and a simultaneous thermal analysis system. The findings suggest that as the initial loading stress increases, the number of micropores and mesopores within the unloaded bulk coal decreases, while the number of macropores increases. Furthermore, important oxidation‐active structures, including ‐OH, ‐CH3, ‐CH2‐, C=O, and ‐COOH, gradually increase, with a slight decrease observed after exceeding 8 MPa. The pressure‐unloading process leads to a gradual decrease in the characteristic temperature of the bulk coal, with the characteristic temperature increasing after exceeding 8 MPa, although it still remains lower than that of the raw coal. As the burial depth of the goaf increases, the oxidation behavior of the unloaded granular coal becomes more pronounced, leading to an increased tendency and risk of spontaneous combustion. If the initial loading stress on deep coal seams is excessive, the oxidation heat production capacity of the resulting unloaded granular coal may be slightly diminished, yet it still poses a significant disaster risk. The research results can provide valuable insights for mitigating and managing spontaneous combustion risks in coal seam mining operations conducted at different depths.

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Compound disaster characteristics of rock burst and coal spontaneous combustion in island mining face: A case study

Liu,

Zhou,

Zhang

et al. 2024

Case Studies in Thermal Engineering

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Optimization of Barrier Pillar Design in Longwall Mining with Top Coal Caving in Spontaneous Combustion Coal Seam

Cited by 4 publications

References 29 publications

Research on cemented artificial pillars to replace protective inter-block coal pillars and stope failure laws

Research on cemented artificial pillars to replace protective inter-block coal pillars and stope failure laws

Study on the influence of unloading disturbance of initial load stress on the microstructure and thermodynamic behavior of granular coal

Compound disaster characteristics of rock burst and coal spontaneous combustion in island mining face: A case study

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