摘要
针对同忻煤矿石炭系特厚煤层工作面在推出上覆遗留煤柱边界时易发生压架的工程问题,采用理论分析和数值模拟方法,研究双系煤层开采时上覆遗留煤柱下采场强矿压机理及发生条件。结果表明:石炭系煤层开采期间,上覆侏罗系遗留煤柱边界顶板两个关键块体形成的铰接结构会发生相向回转运动,从而导致双系煤层间的岩层发生剪切破坏失稳,这是造成上覆遗留煤柱下易发生支架立柱大幅下缩等强矿压的根本原因。
In view of the engineering problem that pressure frame is easy to occur in working face of Carboniferous extra thick coal seam in Tongxin coal mine when pushing out the boundary of overlying residual coal pillar,the mechanism and occurrence conditions of strong ground pressure under the overlying residual coal pillar are studied by theoretical analysis and numerical simulation.The results show that:during the mining period of Carboniferous coal seam,the hinged structure formed by the two key blocks of the overlying Jurassic coal pillar boundary roof will rotate in opposite direction,which will lead to the shear failure and instability of the strata between the double system coal seams,which is the fundamental reason for the occurrence of strong ground pressure such as the support column shrinking greatly under the overlying residual coal pillar.
作者
王少卿
Wang Shaoqing(Tongda Institute of science and technology,Datong Coal Mine Group Co.,Ltd.,Datong Shanxi 037003,China)
出处
《同煤科技》
2020年第5期8-11,共4页
Datong Coal Science & Technology
关键词
遗留煤柱
采场矿压
压架
关键层
Overlying coal pillar
Stope pressure
Pressing Frame
Key stratum
