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1、第42卷第7期煤炭科學技術(shù)Vol?42No?72014年7月CoalScienceandTechnologyJuly2014神東礦區(qū)世界一流礦井建設(shè)示范經(jīng)驗及實用技術(shù)綜采工作面過上覆集中煤柱壓架機理分析周海豐(神華神東煤炭集團有限責任公司生產(chǎn)管理部?陜西神木719315)摘要:為解決下層煤綜采工作面過上覆集中煤柱時易發(fā)生壓架事故的問題?采用理論分析和現(xiàn)場觀測的方法?對石圪臺煤礦22301綜采工作面過上覆集中煤柱壓架事故原因進行分析?揭示壓架事故的機理?并提出相應的防治對策?結(jié)果表明:在工作面出上覆集中煤柱5~20m時?上覆巖層會在上覆集中煤柱邊界破斷?并
2、形成砌體梁式鉸接結(jié)構(gòu)?隨著工作面的推進?鉸接結(jié)構(gòu)的斷裂巖塊會進一步回轉(zhuǎn)失穩(wěn)?對下層煤工作面頂板產(chǎn)生沖擊作用?容易發(fā)生動載礦壓現(xiàn)象?導致壓架事故的發(fā)生?因此?提出了優(yōu)化工作面開采設(shè)計、對上覆集中煤柱實施預裂爆破、工作面調(diào)斜、礦壓觀測等措施?使綜采工作面避開應力集中的影響、周期來壓強度降低、動載礦壓降低?從而達到避免發(fā)生壓架事故的目的?關(guān)鍵詞:淺埋煤層?近距離煤層?上覆采空區(qū)?集中煤柱?壓架事故中圖分類號:TD323文獻標志碼:A文章編號:0253-2336(2014)07-0120-04AnalysisonHydraulicSupportCrushedMe
3、chanismWhenFully-MechanizedCoalMiningFacePassedThroughConcentratedCoalPillarAreainAboveSeamZHOUHai ̄feng(DepartmentofProductionManagement?ShenhuaShendongCoalGroupCorporationLimited?Shenmu719315?China)Abstract:Inordertosolvethehydraulicsupportcrushedaccidentoccurredwhenafully-mecha
4、nizedcoalminingfacepassedthroughcon ̄centratedcoalpillarareainaboveseam?atheoreticalanalysisandasiteminepressureobservationmethodwereappliedtoanalyzethecausesofthehydraulicsupportcrushedaccidentwhenNo.22301fully-mechanizedcoalminingfacepassedthroughthecoalpillarconcen ̄tratedareain
5、aboveseaminShigetaiMine.Thepaperrevealedthemechanismofthehydraulicsupportcrushedaccidentandprovidedtherelevantpreventioncountermeasures.Theresultsshowedthatwhencoalminingfacepassedthroughtheconcentratedcoalpillar5~20m?theoverburdenstratawouldbebrokenattheboundaryoftheconcentrated
6、coalpillarandalinedbeamtypearticulatedstructurewouldbeformed.Withthecoalminingfacepushedforward?thearticulatedstructureformedwiththebrokenrockblockswouldhaveastabilitylostbyafurtherrotarymovement.Thusanimpactrolewouldbeoccurredtothecoalminingfaceinthelowseam?adynamicminepressurep
7、henomenonwouldbeeasilyoccurredandahydraulicsupportcrushedaccidentwouldbecaused.Thereforethepaperprovidedthemeas ̄uresoftheoptimizedminingdesignofthecoalminingface?pre-fracturingblastingontheconcentratedcoalpillarsintheaboveseam?in ̄clinationadjustmentofthecoalminingface?minepressur
8、eobservationandothers?thefully-mechanize