迎采动工作面沿空掘巷预拉力支护及工程应用

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1、第23卷第12期岩石力学与工程学报23(12)：2100～21052004年6月ChineseJournalofRockMechanicsandEngineeringJune，2004迎采动工作面沿空掘巷预拉力支护及工程应用张农李学华高明仕(中国矿业大学采矿工程系徐州221008)摘要迎采动工作面留小煤柱沿空掘巷受邻近工作面侧向顶板破断、转动及稳定的全过程动压影响后，顶板煤体离层，小煤柱破裂，围岩稳定性急剧恶化。为了保持巷道形状，防止大变形状态下的支护结构失效成为支护的关键。常规锚杆支护、锚杆与锚索联合

2、支护等不能维持其稳定；而预拉力钢绞线桁架系统是控制顶板离层的有效支护方式，结合高性能预拉力锚杆、M型钢带、小孔径预拉力短锚索等，形成预拉力组合支护技术，可以较好地解决该类问题。针对三河尖矿的典型试验对此作了详细说明。关键词采矿工程，沿空掘巷，预拉力支护，预拉力桁架，高性能锚杆，小孔径锚索，M型钢带分类号TD353文献标识码A文章编号1000-6915(2004)12-2100-06PRETENSIONEDSUPPORTOFROADWAYDRIVENALONGNEXTGOBANDHEADINGADAJAC

3、ENTADVANCINGCOALFACEANDITSAPPLICATIONZhangNong，LiXuehua，GaoMingshi(DepartmentofMiningEngineering，ChinaUniversityofMiningandTechnology，Xuzhou221008China)AbstractIdentifyingthemovementanddamageoftheroofrockisimportanttotheappropriatesupportdesignofaroadway

4、drivenalongnextgobandheadingadjacentadvancingcoalface，whichisunderstronglydynamicpressureandseverelysubjecttothewholebreakingprocessoflateralmainroofstrata.Amechanicalmodelofthetriangleblockstructureforthemainroofaboveroadwayisestablishedtoelucidatethatt

5、hestructurecankeepself-stablebeforeandafterroadwayexcavation.Becauseoftheadjacentmining-inducedeffect，theseparationofcoalseamorweakrockmassfromtheroofandcollapseofthepurposely-leftnarrowcoalpillarwillunavoidablyoccur，thestabilityofthestructureislowered，a

6、ndthestructuremustbecomeinstablewithdecrementofcoalstrength.Soeffectivesupportisneededtocontroltheseparationofroofandpreventthelargedeformationofroadway.Theconventionalreinforcementforthewallsandcornersofroadwaybybolting，metalsupporting，resinanchoredbolt

7、supportingandthemethodofboltcombinedwithcablearenotgoodenoughtoachievethisgoal.Anewpretensionedsupporttechnologyisrecentlydeveloped，whichisacreativecombinationofpretensionedtrussofsteelstrand，pretensionedcablewithsmallborehole，high-qualityboltandM-shapes

8、teelstrip.AsuccessfulapplicationofthistechnologytoSanhejiancoalmineofXuzhouminingfieldisillustrated，andthegoodbehaviorofthistechnologyisproved.Keywordsminingengineering，roadwaydrivenalongnextgob，pretensionedsupport，pretens