Numerical Simulation of Gas Transportation in Mechanized Top-Coal Caving with Gob-Side Entry Retaining

Abstract:

To solve the problem of gas accumulation in thick-seam top-coal caving mining face, goaf gas migration equations were established based on seepage theory and the law of mass conservation. Taking No.7602 working face of Wuyang coal mine as the study object, gas migration rules of goaf in ventilation of U + I and Y+I were simulated by Fluent, and comparative analysis and verification were carried out by in-situ monitoring data. Test indicates that after gob-side entry retaining, average gas concentration value of No.7602 working face Return airway decreased by 39% compared with similar working face, decreased by 39% in gas emission roadway, decreased by 42% in upper corner. Ventilation of U + I can successfully resolve the problem of gas accumulation in upper corner and working face. The conclusion has a good instruction value to gas control in thick-seam top-coal caving mining face.

• Periodical: Applied Mechanics and Materials (Volume 577)
• Pages: 1170-1173
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.577.1170
• Online since: July 2014
• Authors: Sheng Li*, Jun Wen Li, Guang Yan Zheng, Nuo Nuo Ma
• Keywords: Gas Transportation, Gob-Side Entry Retaining, Mechanized Top-Coal Caving, Numerical Simulation, Pierstud Support

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