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Volume 116
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Dust dispersion characteristics of dual dust sources from shotcrete loading-spraying at U-shaped roadway
Guoming Liu a, Zibiao Feng a, Lianjun Chen a d, Yiming Song b, Siyuan Song c, Pengcheng Li d *
a College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
b Shandong Energy Group Luxi Mining Co., Ltd, China
c State Key Laboratory of Metal Mine Mining Safety and Disaster Prevention and Control, University of Science and Technology Beijing, Beijing, 100083, China
d School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, China
10.1016/j.partic.2026.06.027
Volume 116, September 2026, Pages 340-354
Received 21 April 2026, Revised 23 June 2026, Accepted 24 June 2026, Available online 1 July 2026, Version of Record 14 July 2026.
E-mail: lpc4717@163.com
Highlights

• Development process of airflow in a U-shaped roadway is revealed.

• Differences in dust migration between single and dual dust sources in a U-shaped roadway are identified.

• Distribution characteristics of dust concentration at the breathing zone height in a U-shaped roadway are investigated.


Abstract

Shotcrete operation in a U-shaped roadway generates serious dust pollution, which threatens the occupational health of on-site workers and the safety of equipment. To clarify the dust migration law during coal mine shotcrete operations, this study takes the 52606 shotcrete face of Daliuta Coal Mine as the engineering background. A physical model of the U-shaped roadway is established using SpaceClaim, and Fluent and EDEM software are used to simulate dust migration characteristics during shotcrete loading and spraying. Dust dispersion shows obvious process-dependent differences: during independent loading, dust concentration decreases gradually; during independent spraying, dust first accumulates and then diffuses; during simultaneous loading and spraying, dust dispersion is complex with local high-concentration zones and significant spatiotemporal variations. At the breathing zone height, dust concentration shows consistent distribution rules: during independent loading, the outer bend side of the working face has higher dust concentration; during independent spraying, the inner bend side has higher dust concentration; during combined operation, the outer bend side still maintains a relatively higher dust concentration than the inner bend side. This study provides a theoretical basis for dust concentration control during loading and spraying of shotcrete in U-shaped roadways.

Graphical abstract
Keywords
Shotcrete; Loading; Spraying; Dust diffusion; Numerical simulation
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