Abstract: The multi-process synchronous operation of 11503 fully mechanized caving face in Dishui⁃ yan Coal Mine forms a multi-source coupling dust field，and the dust distribution is complex，and the problem of excessive concentration of respiratory zone is prominent. In order to explore the dust migration law under the airflow disturbance of the working face，this paper combines the actual working conditions of the working face，uses SolidWorks to construct a 1∶1 three-dimensional physical model，relies on the Re⁃ alizable k-ε turbulence model and the DPM discrete phase model，considers the gas-solid two-way cou⁃ pling effect，and completes the airflow-dust coupling numerical simulation of the working face through Flu⁃ ent software. Combined with the measured data of wind speed and dust concentration in the field，the aver⁃ age relative errors between the simulated and measured values of wind flow and dust are less than 8% and 10%，respectively，and the simulation accuracy is reliable. The results show that the wind speed at the out⁃ let of the intake airway，the inlet of the return airway and the disturbance area of the shearer increases sig⁃ nificantly，and the local maximum wind speed can reach 2.1 m/s. The air flow disturbance dominates the dust diffusion and aggregation. A high concentration dust accumulation area is formed in the range of 30 m on the downwind side of the shearer. The dust concentration of the 1.7 m breathing zone is 600~1 000 mg/m3 ， which far exceeded the national safety standard，and the risk of occupational exposure is high. Dust is af⁃ fected by airflow transport and gravity sedimentation，and the dust of the floor gradually settles down，but the sidewalk breathing zone continues to be in a state of high concentration pollution，which is the core ar⁃ ea of dust prevention and control. This study clarifies the mechanism of dust migration，accumulation and settlement under the condition of multi-dust source coupling in fully mechanized caving face，which can provide theoretical reference for ventilation optimization，precise dust reduction and dust control in similar mines.

Key words: fully mechanized caving face, air flow field, dust migration, numerical simulation, dust prevention and control