煤矿安全2025，Vol.56Issue(1)：146-154,9.DOI:10.13347/j.cnki.mkaq.20231695
大倾角特厚煤层综放"分段-分层"复合开采煤柱失稳机制
Instability mechanism of coal pillar in steeply dipping ultra-thick coal seam"segmented and stratified"combined mining
摘要
Abstract
In order to solve the problems of frequent high energy microearthquakes and large roadway deformation in full-mechan-ized caving"segmented and stratified"combined mining in Yanbei Coal Mine with large dip angle and extra-thick coal seam,theor-etical analysis,numerical simulation and field measurement are used to study the bearing stress characteristics of coal pillars and the instability mechanism of coal pillars.The load-bearing mechanical model of composite mining coal pillar is established,and the load-bearing stress distribution under the influence of coal pillar width is analyzed in three forms:asymmetric saddle shape,asymmetric platform shape and single peak shape,and it is determined that the load-bearing stress of coal pillar is more prone to instability when it is presented in asymmetric platform shape.The simulation results show that under the influence of pre-abutment pressure in in-clined stratified mining,the section coal pillar is in a state of high stress,and the stress change rate is the most significant.The main cause of pillar instability is the local stress concentration in the combined mining of"segmented and stratified"coal seam with large dip angle;based on the instability mechanism of coal pillar in the composite mining area with large dip angle and ultra-thick coal seam,the prevention and control idea of rock burst of working face and key areas,the plan of the deep hole pre-splitting blasting in the roof and the combining of near and far blasting in the coal body,pressure relief in batches and shock absorption and shock pre-vention is formulated,which effectively reduces the stress and energy level of the gob side and significantly reduces the"segmented and stratified"composite mining of large dip angle and ultra-thick coal seam.关键词
大倾角煤层/冲击地压/复合开采/区段煤柱/围岩稳定性/煤柱失稳Key words
steeply dipping seam/rock burst/composite mining/section coal pillar/surrounding rock stability/coal pillar instabity分类
矿业与冶金引用本文复制引用
刘用,杨耀,王骁,王文强,吴学松,曹安业,陆祖军,杨涛,魏占全..大倾角特厚煤层综放"分段-分层"复合开采煤柱失稳机制[J].煤矿安全,2025,56(1):146-154,9.基金项目
国家自然科学基金资助项目(52274098,U21A20110) （52274098,U21A20110）
