Ventilation system arrangement in large cross-section tunnels：a CFD simulation based on direct initial concentration
Chao Cao1,2, Jiyun Zhao1,2, Haigang Ding1,2
1a School of Mechatronic Engineering, China University of Ming & Technology , Xuzhou , China.
International Journal of Environmental Health Research
|December 1, 2018
Summary
This study developed models to accurately measure initial dust concentrations in large tunnels. Findings show ventilation system rules from smaller tunnels can be adapted for improved dust control and safety.
Area of Science:
- Mining Engineering
- Environmental Science
- Computational Fluid Dynamics
Background:
- Dust removal efficiency is critical for safety in large cross-section tunnels.
- Accurate initial dust concentration assessment is challenging due to cutting head movement and large drift spaces.
Purpose of the Study:
- To ascertain initial dust concentration in large tunnels using cutting and computational fluid dynamics (CFD) models.
- To investigate dust movement regularity and optimize ventilation system arrangements.
- To determine optimal ventilation parameters for large cross-section tunnels.
Main Methods:
- Development of cutting models to determine initial dust concentrations.
- Establishment of computational fluid dynamics (CFD) models to simulate dust movement.
- Comparative analysis of ventilation system arrangements and airflow parameters.
Main Results:
- Established methods for accurately deducing initial dust concentrations in large tunnels.
- Demonstrated that some ventilation system layout rules for small tunnels are applicable to large ones.
- Identified optimal ranges for ventilation outlet distance and airflow ratios.
- Analyzed and optimized dust concentration distribution at different heights.
Conclusions:
- The study provides a methodology for assessing and controlling dust in large cross-section tunnels.
- Findings offer practical guidelines for designing effective ventilation systems in hard rock mining.
- The research contributes to improving safety and environmental conditions in underground excavations.
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