SichuanHydropower61近平行陡倾薄层状炭质板岩特征及变形规律研究孙慕楠(中国水利水电第七工程局有限公司,四川成都610213)摘要:随着国内铁路隧道建设的大力发展,软岩大变形隧道建设成为阻碍我国铁路隧道建设发展的重大难题,而近平行陡倾薄层状炭质板岩隧道作为软岩隧道中的典型,其围岩极易发生大变形灾害。通过对某在建铁路隧道薄层状炭质板岩特征及隧道变形规律进行分析,得出薄层状炭质板岩自身强度低,且其含大量黏土矿物遇水极易软化,层理间存在镜面现象,受地应力方向、层理结构和洞轴线不利组合影响极易发生岩层开裂现象导致近平行陡倾薄层状软岩隧道极易在隧道拱腰至拱脚边墙处发生大变形灾害。阐述了对近平行陡倾薄层状炭质板岩特征及变形规律进行的研究。关键词:陡倾围岩;近平行;薄层状围岩;变形监测中图分类号:[U25];U215;U212文献标志码:B文章编号:1001-2184(2023)05-0061-05StudyontheCharacteristicsandDeformationLawofSubparallelSteeplyDippingThin-beddedCarbonaceousSlateSUNMunan(SinohydroBureau7Co.,Ltd.,ChengduSichuan610213)Abstract:Withthevigorousdevelopmentofdomesticrailwaytunnelconstruction,softrocklargedeformationtunnelconstructionhasbecomeamajorproblemhinderingthedevelopmentofrailwaytunnelconstructioninChina,thesubparallelsteeplyinclinedthin-beddedcarbonaceousslatetunnelasatypicalsoftrocktunnel,ofwhichthesurroundingrockispronetolargedeformationdisasters.Throughtheanalysisofthecharacteristicsofthin-beddedcarbonaceousslateandtunneldeformationlawofarailwaytunnelunderconstruction,itiscon-cludedthatthethin-beddedcarbonaceousslatehaslowstrength,andcontainsalargeamountofclaymineralsthatareeasytosoftenwhenexposedtowater.Thereisamirrorphenomenonbetweenthelayers,andduetotheunfavorablecombinationofdirectionofgroundstress,thethebeddingstructureandthetunnelaxis,rocklayercrackingisveryeasytooccur,resultingthatthesub-parallelsteeplyinclinedthin-layeredsoftrocktunnelisiseasytohavesidewallsfromthetunnelarchwaisttothearchtoe.Thispaperdescribestheresearchonthecharacteristicsanddeformationrulesofsubparallelsteeplydippingthin-beddedcarbonaceousslate.Keywords:Steeplyinclinedsurroundingrock;Subparalle;Thin-beddedsurroundingrock;Deformati...
