煤矿安全2025，Vol.56Issue(5)：100-113,14.DOI:10.13347/j.cnki.mkaq.20250241
中远距离煤层群保护层多次开采卸压效果研究
Study on pressure relief effect of multiple mining of protective layer in medium and long distance coal seam group
摘要
Abstract
Aiming at the problem that the effect of protective layer mining of medium and long distance coal seam group under com-plex conditions is not clear,this study takes the coal seam group mining of Shanxi Xinjing Coal Mine as the engineering background,and uses the method of numerical simulation and physical similarity simulation to study the multiple pressure relief effect of medi-um and long distance coal seam group under the downward mining sequence.The evolution law of mining stress and movement de-formation of protected layer is analyzed,and the pressure relief effect of protective layer mining is verified by field test.The numer-ical simulation results show that when the working faces of 8#,9#and 15#coal seams advanced to 110 m,the minimum stress con-centration coefficients of the coal body in front of the working face are 0.36,0.25 and 1.30,respectively.After the completion of 3#coal seam mining,the maximum expansion deformation of 8#and 9#coal seam is 165.4 mm and 57.8 mm respectively,and the max-imum expansion deformation of 15#coal seam is only 11.4 mm after the completion of 9#coal seam mining.The results of similar simulation experiments show that when the working face is advanced to 190 m,the stress concentration factors in front of 8#,9#and 15#coal seams are 0.90,0.84 and 1.14,respectively.The superimposed pressure relief effect caused by multiple mining of the pro-tective layer of the coal seam group makes the displacement field of the overlying strata appear obvious superimposed changes.The maximum subsidence of the 3#coal seam roof increases from 0.51 m under primary mining to 1.16 m under tertiary mining.The res-ults of the numerical simulation and similar simulation show that in the process of downward mining,the mining of the protective layer 3#and 8#coal seams has a significant pressure relief effect on the lower protected layer,while the 15#coal seam is basically not affected by the multiple mining pressure relief of the upper 3#,8#and 9#coal seams.The results of field investigation and test show that after the mining of 3109 working face,the maximum pressure relief ratios of 8#and 9#coal seams reach 35.65%and 21.59%re-spectively,and the corresponding maximum relative deformation is 10.31‰ and 5.73‰ respectively.关键词
中远距离煤层群/保护层开采/多次采动/叠加卸压/下行开采Key words
medium and long distance coal seam group/protective layer mining/multiple mining/superimposed pressure relief/downward mining分类
矿山工程引用本文复制引用
张夏彭,王凯,周爱桃,易克全,李泽凡,王柯嘉..中远距离煤层群保护层多次开采卸压效果研究[J].煤矿安全,2025,56(5):100-113,14.基金项目
国家自然科学基金资助项目(52130409,52121003) （52130409,52121003）
