近距离煤层开采围岩破坏及支护阻力研究*黄自炎，张伟胜（郑州煤矿机械集团股份有限公司，郑州450017）摘要：针对近距离煤层开采围岩破坏所引起的工作面冒顶、漏矸问题，以甘肃某矿采矿地质条件为背景，通过理论分析采高和应力集中系数对底板破坏深度的影响关系，得出当采高大于6m时，应力集中系数大于3时，对底板破坏深度影响程度显著。通过数值模拟得到16#煤层开采超前支承压力集中系数约3.75，覆岩破坏高度约30m，结合理论分析结果得出底板破坏深度约4.23m。17#煤层顶板受16#煤层采动影响产生破坏，液压支架承担17#煤层与16#煤层层间岩体与16#煤层采空区垮落岩层的载荷，确定液压支架支护强度应不小于0.61MPa，以保证17#煤层工作面安全高效开采。关键词：近距离煤层；底板破坏深度；数值模拟；支护阻力中图分类号：TD323文献标志码：A文章编号：1008－8725（2023）02－044－03StudyonFailureofSurroundingRockandSupportResistanceinCloseDistanceCoalSeamHUANGZiyan,ZHANGWeisheng(ZhengzhouCoalMiningMachinery(Group)Co.,Ltd.,Zhengzhou450017,China)Abstract：Forclosedistancecoalseamcoalfacerooffallingandcollapsedrockcausedbydamageofsurroundingrock,takingthemininggeologicalconditionsofamineinGansuprovinceasthebackground,throughthetheoreticalanalysistheinfluenceofminingheightandstressconcentrationcoefficientonfloorfailuredepth,itisconcludedthatwhenminingheightisgreaterthan6m,thestressconcentrationcoefficientismorethan3,significantinfluenceonfloorfailuredepth.Throughnumericalsimulation,theconcentrationcoefficientofadvancedabutmentpressureofNo.16coalseamisabout3.75,thefailureheightofoverburdenisabout30m,andthefloorfailuredepthisabout4.23mcombinedwiththeoreticalanalysisresults.TheroofofNo.17coalseamisdamagedbytheminingeffectofNo.16coalseam.ThehydraulicsupportbearstheloadofrockmassbetweenNo.17coalseamandNo.16coalseamandtheloadofcavedrocklayerofthegoafofNo.16coalseam.Thesupportstrengthofthehydraulicsupportshouldbedeterminednotlessthan0.61MPatoensurethesafeandefficientminingofthecoalfaceofNo.17coalseam.Keywords:closedistancecoalseam;floorfailuredepth;numericalsimulation;supportresistance第42卷第02期2023年02月煤炭技术CoalTechnologyVol.42No.02Feb...
