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时间:2019-02-04
《综采工作面过上覆集中煤柱压架机理分析》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第42卷第7期煤炭科学技术Vol?42No?72014年7月CoalScienceandTechnologyJuly2014神东矿区世界一流矿井建设示范经验及实用技术综采工作面过上覆集中煤柱压架机理分析周海丰(神华神东煤炭集团有限责任公司生产管理部ꎬ陕西神木719315)摘要:为解决下层煤综采工作面过上覆集中煤柱时易发生压架事故的问题ꎬ采用理论分析和现场观测的方法ꎬ对石圪台煤矿22301综采工作面过上覆集中煤柱压架事故原因进行分析ꎬ揭示压架事故的机理ꎬ并提出相应的防治对策ꎮ结果表明:在工作面出上覆集中煤柱5~20m时ꎬ上覆岩层会在上覆集中煤柱边界破断ꎬ并
2、形成砌体梁式铰接结构ꎬ随着工作面的推进ꎬ铰接结构的断裂岩块会进一步回转失稳ꎬ对下层煤工作面顶板产生冲击作用ꎬ容易发生动载矿压现象ꎬ导致压架事故的发生ꎮ因此ꎬ提出了优化工作面开采设计、对上覆集中煤柱实施预裂爆破、工作面调斜、矿压观测等措施ꎬ使综采工作面避开应力集中的影响、周期来压强度降低、动载矿压降低ꎬ从而达到避免发生压架事故的目的ꎮ关键词:浅埋煤层ꎻ近距离煤层ꎻ上覆采空区ꎻ集中煤柱ꎻ压架事故中图分类号:TD323文献标志码:A文章编号:0253-2336(2014)07-0120-04AnalysisonHydraulicSupportCrushedMe
3、chanismWhenFully-MechanizedCoalMiningFacePassedThroughConcentratedCoalPillarAreainAboveSeamZHOUHai ̄feng(DepartmentofProductionManagementꎬShenhuaShendongCoalGroupCorporationLimitedꎬShenmu719315ꎬChina)Abstract:Inordertosolvethehydraulicsupportcrushedaccidentoccurredwhenafully-mecha
4、nizedcoalminingfacepassedthroughcon ̄centratedcoalpillarareainaboveseamꎬatheoreticalanalysisandasiteminepressureobservationmethodwereappliedtoanalyzethecausesofthehydraulicsupportcrushedaccidentwhenNo.22301fully-mechanizedcoalminingfacepassedthroughthecoalpillarconcen ̄tratedareain
5、aboveseaminShigetaiMine.Thepaperrevealedthemechanismofthehydraulicsupportcrushedaccidentandprovidedtherelevantpreventioncountermeasures.Theresultsshowedthatwhencoalminingfacepassedthroughtheconcentratedcoalpillar5~20mꎬtheoverburdenstratawouldbebrokenattheboundaryoftheconcentrated
6、coalpillarandalinedbeamtypearticulatedstructurewouldbeformed.Withthecoalminingfacepushedforwardꎬthearticulatedstructureformedwiththebrokenrockblockswouldhaveastabilitylostbyafurtherrotarymovement.Thusanimpactrolewouldbeoccurredtothecoalminingfaceinthelowseamꎬadynamicminepressurep
7、henomenonwouldbeeasilyoccurredandahydraulicsupportcrushedaccidentwouldbecaused.Thereforethepaperprovidedthemeas ̄uresoftheoptimizedminingdesignofthecoalminingfaceꎬpre-fracturingblastingontheconcentratedcoalpillarsintheaboveseamꎬin ̄clinationadjustmentofthecoalminingfaceꎬminepressur
8、eobservationandothersꎬthefully-mechanize
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