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Updated: Jan 7, 2026

Design and Optimization Strategies of a High-Performance Vented Box
Published on: June 9, 2023
Numerical Investigation of Gas Migration and Spatiotemporal Evolution in Y‑Type Ventilation Working Faces with
Yaowei Zhai1, Yuzhong Yang1, Liyun Wu1
1School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
None:
China has numerous gassy and outburst-prone coal mines. Y-type ventilation with gob-side entry retaining enhances resource recovery and reduces excessive gas in the upper corner but may cause gas buildup at the working face and gob-side entry retaining tail. To address this, a two-dimensional dynamic gas migration model of the goaf was developed in COMSOL to simulate gas concentration evolution under advancing speeds of 6, 9, and 12 m/d and airflow distribution ratios of 2:1, 1.5:1, 1:1, 1:1.5, and 1:2. Higher advancing speeds intensify coal disturbance and gas desorption, resulting in peak concentrations of 1.10 and 0.95% under 12 m/d. At 9 m/d, the values decrease to 0.74 and 0.48%, indicating the optimal advancing speed. Reducing to 6 m/d further lowers concentrations but shows marginal improvement, implying a threshold effect. The airflow distribution ratio significantly affects gas migration: a Z2:F1 ratio lowers working face concentration but raises gob-side entry retaining concentration, while Z1:F2 shows the opposite trend. The 1:1.5 ratio provides the most balanced result, maintaining peak concentrations at 0.62 and 0.55%. The discrepancy between simulation and field data is within 0.03, confirming model reliability. These results provide practical guidance for optimizing ventilation and controlling gas hazards in Y-type ventilated faces.
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