Prediction of gas emission from fully-mechanized caving face in extra-thick coal seam under the occurrence of coal seam group
Wang Zhengshuai
Luo Shuai
Abstract：In order to grasp the gas emission rate of fully-mechanized top coal caving working face in thick coal seam group under the occurrence conditions of Fukang Mining Area,the source separation prediction method was used to predict the gas emission and propor-tion of layered coal body,adjacent layers,top coal caving,coal cutting,and residual coal in goaf under the working face,providing a ba-sis for gas control work.The research results show that during the mining period of layered working face at the top of large trench in the east wing+676～+730 m,the proportion of gas emission from the lower layer of working face is 45.63％,the adjacent layer is 26.63％,the top coal caving is 14.34％,the coal cutting is 8.44％,and the remaining coal in the goaf is 4.96％.The maximum absolute gas e-mission from the working face is 38.08 m3/min.After taking targeted control measures,the amount of gas flowing into the working face from various gas emission sources was significantly reduced,with an exhaust gas volume of 4.18 m3/min and a return airflow speed of 1.59 m/s,which can meet the normal production needs of working face.
Keywords：fully-mechanized caving facegas emissiongas emission sourcecoal seam group
Publication Date：2025-10-30
Online Publishing Date：2025-11-27(First online date of this platform, not the publication date of the document)
Pages：5( 146-150 )