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<p>In this paper, an independently developed experimental simulation platform was used to examine dustfall during hydraulic support movement by varying the wind speed in the roadway and proportion of different dust particle sizes. Additionally, numerical simulation methods were used to ascertain the distribution patterns of the dust concentration and particle size. The study reveals that the dust concentration decreases with increasing distance from the dust source. Higher wind speeds result in lower dust concentrations, where the rate of decrease is more pronounced within 4 m of the dust source. Specifically, at a wind speed of 2.30 m/s, the dust concentration decreased from 546 to 103 mg/m<sup>3</sup> within 4 m of the dust measurement point, i.e., a decrease of 81.1%. Furthermore, the average particle size of dust decreases with increasing distance from the dust source. Higher wind speeds lead to larger average dust particle sizes measured at the test points. For example, at a wind speed of 2.30 m/s, the average dust particle size decreased from 88 to 16 μm within 4 m of the dust source, i.e., a decrease of 81.8%. The maximum absolute error in the relative change rate of the average particle diameter of dust between experimental simulation and numerical simulation results is 0.04, indicating a high degree of agreement between the two. These findings provide valuable theoretical guidance and data support to manage dustfall during hydraulic support movement in fully mechanized mining faces.</p>

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Experimental Study on the Distribution Characteristics of Dustfall During Hydraulic Support Movement with Different Particle Size Ratios in a Fully-Mechanized Mining Face Under the Action of a Wind Flow Field

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Qingyi Tu,
  • Fei Xing,
  • Xingxing Xu,
  • Wei Zhang,
  • Gaofeng Shi,
  • Sheng Xue

摘要

In this paper, an independently developed experimental simulation platform was used to examine dustfall during hydraulic support movement by varying the wind speed in the roadway and proportion of different dust particle sizes. Additionally, numerical simulation methods were used to ascertain the distribution patterns of the dust concentration and particle size. The study reveals that the dust concentration decreases with increasing distance from the dust source. Higher wind speeds result in lower dust concentrations, where the rate of decrease is more pronounced within 4 m of the dust source. Specifically, at a wind speed of 2.30 m/s, the dust concentration decreased from 546 to 103 mg/m3 within 4 m of the dust measurement point, i.e., a decrease of 81.1%. Furthermore, the average particle size of dust decreases with increasing distance from the dust source. Higher wind speeds lead to larger average dust particle sizes measured at the test points. For example, at a wind speed of 2.30 m/s, the average dust particle size decreased from 88 to 16 μm within 4 m of the dust source, i.e., a decrease of 81.8%. The maximum absolute error in the relative change rate of the average particle diameter of dust between experimental simulation and numerical simulation results is 0.04, indicating a high degree of agreement between the two. These findings provide valuable theoretical guidance and data support to manage dustfall during hydraulic support movement in fully mechanized mining faces.