林南仓矿极不充分开采宽度设计与数值模拟研究

摘要

Strip mining was applied in the second mining area that under village at -650m level of Linnancang coal mine, numerical simulation analysis and design were done by numerical simulation method RFPA, overburden movement and broken process were ana-lyzed, stable arch balance structure formed in overburden under medium harden interlayer rock structure and extremely inadequate mining condition, rock broken appeared in balance arch, rock bend deformation appeared out of balance arch.Mining method of ex-tremely inadequate mining of Linnancang coal mine was put forward on the basis of numerical simulation, coal pillar stability was ana-lyzed, the results of FLAC3D simulation showed that two extremely inadequate mining working faces would be isolated to a relative inde-pendence working face, when coal pillar width was 70m, then surface movement and deformation could be controlled effectively.%针对林南仓矿-650m水平二采区村庄下条带开采,采用FLAC3D数值模拟方法进行了模拟分析设计,分析了覆岩移动和破坏过程,认为在中硬互层型的岩层结构、 极不充分开采条件下,在上覆岩层中形成了稳定的拱型平衡结构,在平衡拱内岩石破坏、 垮落,在平衡拱外岩层弯曲变形.依据数值模拟结果,设计了林南仓矿极不充分开采方案,对煤柱稳定性进行了分析,FLAC3D计算结果表明当煤柱宽度达到70 m时,可以将两个极不充分开采工作面隔离成相对独立的开采工作面,能有效地控制地表的移动和变形.