采矿与岩层控制工程学报2025，Vol.7Issue(6)：192-202,11.DOI:10.13532/j.jmsce.cn10-1638/td.2025-1129
露天边帮下大采高工作面覆岩悬臂梁结构及强矿压机理研究
Strong mine stress mechanism and cantilever beam structural model in large mining height working face beneath open-pit slope
摘要
Abstract
Taking the 2201 working face of Haiwan Coal Mine No.3 as a case,the overburden collapse patterns during mining beneath open-pit slopes were studied using physical simulation,numerical simulation and theoretical analysis.A structural model of"large cantilever beam and high-position oblique step voussior beam"was established.The mechanism of strong mine pressure in the initial mining stage under the open-pit slope was revealed.The results show that due to the existence of the open-pit slope,the continuity of the stratum is cut off,and the overlying strata and the surface loess layer form a large cantilever beam fracture and subsidence during the initial mining stage of the working face,which destroys the original caving law of the overlying strata and forms the strong mine pressure.When the working face advanced to 160 m,the advanced fracture development depth in loess layers reached 90 m.When the working face advanced to 178 m,the"large cantilever beam and high-position oblique step voussior beam"structure formed,with peak support load exceeding 50000 kN/set,forming the strong mine pressure.By establishing a mechanical model of the"large cantilever beam",the force balance equations of the rock blocks and the support resistance formula were derived,and the mechanism of strong mine pressure caused by large cantilever beam structure was revealed.A hydraulic fracturing layer that eliminates the formation conditions of large cantilever beam was proposed.By using the numerical simulation method of hydraulic fracturing and support resistance monitoring,it is found that eliminating the large cantilever beam structure can avoid the occurrence of strong mine pressure,and has been verified by engineering practice.关键词
浅埋煤层/大采高工作面/边帮下开采/强矿压/悬臂梁结构Key words
shallow coal seams/large mining height working face/open-pit slope mining/strong mine pressure/cantilever beam structure分类
矿业与冶金引用本文复制引用
黄庆享,韦业豪,贺雁鹏..露天边帮下大采高工作面覆岩悬臂梁结构及强矿压机理研究[J].采矿与岩层控制工程学报,2025,7(6):192-202,11.基金项目
国家自然科学基金资助项目(52074211) （52074211）
