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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.
Optimizing Y-type ventilation in gassy mines requires balancing advancing speed and airflow. An optimal advancing speed of 9 m/d and a 1:1.5 airflow ratio minimize gas buildup, enhancing safety and resource recovery.
Area of Science:
- Mining Engineering
- Geotechnical Engineering
- Environmental Engineering
Background:
- China's coal mines face challenges with gas and outbursts.
- Y-type ventilation with gob-side entry retaining improves recovery but can concentrate gas.
Purpose of the Study:
- To investigate gas migration in goaf under Y-type ventilation.
- To optimize advancing speed and airflow distribution for gas control.
Main Methods:
- Developed a 2D dynamic gas migration model in COMSOL.
- Simulated gas concentration evolution at various advancing speeds (6-12 m/d) and airflow ratios (2:1 to 1:2).
Main Results:
- Higher advancing speeds (12 m/d) increased peak gas concentrations (1.10%).
- An advancing speed of 9 m/d yielded optimal results (0.74% and 0.48%).
- An airflow ratio of 1:1.5 balanced gas concentrations effectively (0.62% and 0.55%).
Conclusions:
- Advancing speed and airflow ratio are critical for managing gas hazards.
- The 9 m/d speed and 1:1.5 ratio offer practical solutions for Y-type ventilated faces.
- Model validation against field data confirms reliability for guiding ventilation strategies.
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