Abstract:
After adopting the 110 mining method,the ventilation mode of the working face shifted from U-type to Y-type ventilation,resulting in increased air leakage in the gob area. This has led to accelerated oxidation of residual coal under highoxygen conditions caused by air leakage. To understand the air leakage patterns in the gob area and along the goaf-side entry of the 1010 working face during mining of No. 1 Huangling Coal Mine,this paper takes the 1010 working face of the No. 1 Huangling Mine as the engineering background. By combining theoretical analysis with field measurements,the study investigates the air leakage patterns after the fully mechanized mining face connects with the gob area under the 110 mining method. The research shows that there are multiple air leakage channels in the 1010 working face and its rear entry,with an average air leakage rate exceeding 0.27~0. 48 m/s. Along the goaf-side entry of the 1010 working face,from 150 m to 900 m,the air volume continuously increases,with the primary area of airflow from the gob area to the goaf-side entry located between 150 m and 300 m. Additionally,air leakage from the gob area to the working face occurs between support No. 119 and support No. 11. Based on these findings,a sealing technology involving “constructing isolation walls and injecting grout into the gob area” is proposed for the main air leakage zones to address the air leakage issue and ensure safe and efficient coal mine production.