Definition of Pressure Relief Range and Effect Analysis of Regional Measures in Long-distance Mining of Protective Seam

3rd International Symposium on Resource Exploration and Environmental Science

生态环境科学

Li, Siqian^1^2

Research Institute of CO, Ltd, China Coal Technology Engineering Group, Chongqing, China^1

State Key Laboratory of Gas Disaster Monitoring and Emergency Technology, China^2

关键词: Coal seam groups;    Effect analysis;    Field investigation;    Gas extractions;    Protection effect;    Protection layers;    Protective seams;    Surface drilling;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/300/2/022094/pdf
DOI  :  10.1088/1755-1315/300/2/022094

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Based on the engineering background of the protection layer mining of the long distance and near horizontal coal seam group in Zhujixi Coal Mine, by means of theoretical analysis, numerical simulation and field investigation, the scope of pressure relief protection of the protected layer after the protection layer mining is studied and determined, and the effect of regional measures of surface drilling and underground perforation extraction measures is evaluated. The results show that the pressure relief angles in strike and dip directions are 63.7° and 80.8° respectively. The maximum residual gas content is 5.28m3/t and the gas extraction rate is 81.4%. The pressure relief protection effect is remarkable, effectively eliminating the outburst risk of the protected layer.