资源描述:
《高应力软岩巷道巷外掘巷卸压及二次支护技术》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、高应力软岩巷道巷外掘巷卸压及二次支护技术摘要随着矿井开采深度的增加,深部高应力软岩巷道受各种因素的影响,变形越来越剧烈,破坏严重,其支护问题越来越突出。本文通过理论分析,数值模拟,现场试验等方式对朱集东矿-885轨道大巷进行研究,得出以下结论:(1)朱集东矿-885轨道大巷具有大变形流变性、巷内支护严重破坏以及巷道围岩破碎的特征,是典型的深部高应力软岩巷道。造成其坏的原因为:巷道围岩应力场复杂、支护结构不合理、巷道围岩的物理及力学特性以及受采动的影响;(2)通过理论分析及数值模拟可知:深部高应力软岩巷道的变形与巷道支护阻力,围岩岩性,受力状态以及支护方式有关;在高应力的作
2、用下,从软岩巷道开挖后的10天到70天,巷道顶底板位移随时间呈现线性逐渐增大趋势,巷道的围岩破碎区域也随之不断向深部延伸;(3)通过对三种卸压方案模拟分析,侧下角卸压最合理。方案三对减小底板的效果比较明显,同时,相对于无卸压条件下,帮部位移量减少36%,底鼓量减少46%;(4)朱集东矿-885轨道巷道通过锚索梁支护,变被动支护为主动支护,增加巷道的支护阻力,改变U型棚完全被动支护的状态;通过深浅孔注浆,增大巷道围岩圈的自身承载能力,改变软岩巷道的围岩性质,提高了围岩的内聚力和摩擦角,增强自身承载能力,维护了巷道的长期稳定。该二次支护方案在技术上及经济上具有一定的可行性。该
3、论文有图41幅,表7个,参考文献99篇。关键词:高应力;软岩巷道;巷外掘巷;二次支护XIIIAbstractWiththeincreaseofminingdepth,deephigh-stresssoftrockroadwaysisaffectedbyvariousfactors.Thedeformationismoreandmoreintense,andthedamageisserious.Thesupportingproblemsaremoreandmoreprominent.Inmypaper,throughtheoreticalanalysis,numerical
4、simulationandfieldtestmethodsandpracticeof-885roadwayinZhuJidongcoalmine,themainconclusionsareasfollows:(1)-885roadwayisatypicaldeephighstresssoftrockroadways.Anditscharacteristicsissupportseriousdamage,largedeformationrheological,surroundingrockbroken.Thecausearethecomplexstressfieldofsu
5、rroundingrockofroadway,thesupportingstructureunreasonable,thephysicalandmechanicalcharacteristicsofsurroundingrockofroadway,andaffectedbymining;(2)Thetheoreticalanalysisandnumericalsimulationshowsthatthedeformationofdeephighstresssoftroadwayapplystosupportresistanceofroadwaysurroundingroc
6、klithology,stressstateandrelatedsupportmode.Undertheactionofhighstress,fromthesoftrocktunnelexcavationafter10dto70d,displacementofroofandfloorpresentatendencyoflinearincreasegradually,overtimetodeeproadwaysurroundingrockbrokenareagrewwithextension;(3)Throughsimulationanalysisofthethreetyp
7、esofpressurereliefprogram,coMParedwithnopressurereliefroadways,sideAngleunderunloadingthemostreasonable.Planthreeismorenoticeabletoreducetheeffectofthebottomplate.Atthesametime,relativetotheunloadingconditions,roofdisplacementdecreasedby23%,andbottomdisplacementby40