近距离下部特厚煤层工作面安全错距研究

摘要

在近距离下部特厚煤层条件下，由于下部煤层厚度大，经验方法类比计算的工作面错距偏小。因此根据鲍店上部2煤层与下部3煤层实际情况，采用UDEC2D数值模拟及理论分析，综合研究了近距离下部特厚煤层工作面开采的安全错距。研究表明：近距离下部特厚煤层工作面同采时，不同工作面错距条件下的应力分布与覆岩运移特征有着明显的差异，当工作面错距大于50 m时相互采动影响较小，确定工作面安全错距为60 m。%Under the condition of closed extremely-thick coalseams , safety distance of mining faces calculated by experience analogy method was small.Applying UDEC2D software and theoretical analysis , safety distance of mining faces was researched on the basis of 2nd Coal and 3rd Coal condition.Result showed that there were obvious difference in stress distribution and surrounding rock movement characteristic under different safety distances .When the distance was larger than 50m, mutual influence was small.Therefore, safety distance was designed as 60m.