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1、第21卷第4期(总第131期)煤矿开采Vol．21No．4(SeriesNo．131)2016年8月COALMININGTECHNOLOGYAugust2016坚硬顶板工作面自掘回撤通道留设技术研究1,22,32,3孙志勇,李永浍,宋强军(1．天地科技股份有限公司开采设计事业部,北京100013;2．山西晋煤集团技术研究院有限责任公司,山西晋城048000;3．山西晋煤集团凤凰山煤矿,山西晋城048007)[摘要]针对典型的厚层坚硬难垮直接顶板围岩条件,以晋煤集团凤凰山矿15号煤综采工作面XV5302回撤通道留设为工程背景,在分析原留设方式存在的问题的基础上,提出新的回撤通道留
2、设施工工艺及支护参数。基于坚硬难垮顶板覆岩破断特征,建立了末采期间回撤通道承载结构模型,指出顶板在回撤通道后方断裂是最优承载状态。提出了水力压裂控顶与高强支护相结合的回撤通道留设方法,一方面采用水力压裂技术切顶卸压,将回撤通道预定位置人为尽量避开周期来压;另一方面对通道顶板进行高预应力全锚索支护,取消了木垛施工,实现了整个撤架过程的全负压通风,有效解决了瓦斯问题和顶板管理问题。该技术在凤凰山矿进行了工业试验并大面积推广应用,大幅度提高了撤架效率和施工安全,显著降低了劳动强度和生产成本,取得了良好的经济社会效益。[关键词]坚硬难垮直接顶;回撤通道;留设方式;水力压裂;高强支护[中
3、图分类号]TD823．85[文献标识码]A[文章编号]1006-6225(2016)04-0065-04LayoutTechniqueofWorkingFaceSelf-drivingDismantlingTunnelwithHardenRoof1,22,32,3SUNZhi-yong,LIYong-hui,SONGQiang-jun(1．CoalMining&DesigningDepartment,TiandiScience&TechnologyCo．,Ltd．,Beijing100013,China;2．ShanxiJinCoalCorporationTechnologyR
4、esearchInstituteCo．,Ltd．,Jincheng048000,China;3．FenghuangshanCoalMine,ShanxiJinCoalCorporation,Jincheng048007,China)Abstract:Tothetypicalsurroundingrocksituationthickandhardendifficultyfallofimmediateroof,ittakingXV5302dismantlingtunnellayoutoffullymechanizedworkingfaceinthefifteenthcoalseam
5、ofFenghuangshancoalmineofJincoalcorporationasback-ground,onthebasisofallproblemsoftheoriginallayoutmethod,theconstructiontechnologyandsupportingparametersofnewdis-mantlingtunnellayoutwereputforward．Onthebasisofoverburdenbrokenfeaturesofhardenanddifficultyfallroof,thebearingstruc-turemodelofd
6、ismantlingtunnelduringthelastcuttingstopewasbuilt,theoptimalbearingstatewasrooffractureatrearofdismantlingtunnel．Thelayoutmethodofdismantlingtunnelwithhydrofracturecontrollingroofandhighstrengthsupportingwasputforward,onsideroofslicedandreducedpressurewithhydrofracturetechnology,andtheroofpr
7、esetpositionofdismantlingtunnelavoidedperiodicweightingbyman-made,theothersidetheroofofdismantlingtunnelwassupportedbyhighprestressfullycable,andwoodcribssup-portingwascanceled,thefullynegativepressureventilationwasrealizedduringsupportsredrawing,s
