隧道塌方总结1.docx

隧道塌方总结1

第一篇：隧道塌方总结1隧道围岩大变形研究分析duetotheinfluenceofnaturalgeologicalconditions,collapseaccidentoftenbringenormousdamagetothetunnelconstructioninthelargesectiontunnelexcavationofroad(orrailroad)construction.engineeringequipmentandthesafetyofpersonnelareseriouslythreatenedbythecollapseoftunnelwhichhasthecharacterofhighincidenceandhighrisk.1、primaryinfluencefactorsandtypesoftunnelcollapse1.1ThemainfactorsoftunnelcollapseTherearemanyinfluencefactorsintunnelcollapse,generallycanbepidedintoexternalandinternalfactors,internalfactorsaremainlyrefertotheengineeringgeologicalandhydrogeologicalconditions,externalfactorsaremainlyrefertoimproperdesignandconstruction.1)unfavorablegeologicalconditionsunfavorablegeologicalmainlyincludestheweatheredmetamorphicrock,fracturedrockmassandrockpilearea,fault,karstcave,landslide,mudslide,swellingstrata,etc.whenthetunnelencounteredtothosegeologicalcondition,someslightnegligencemayleadtothecollapseoftunnel.2)undergroundwaterGroundwaterisoneoftheimportantfactorsinfluencingthestabilityofsurroundingrock.itnotonlyreducesthestrengthofrockwhichhashighsofteningcoefficient,andalsoreducestheshearstrengthofstructureplane.3)geostressgeostressmainlyincludesthebias,plasticity,landslidesandhighgroundstressarea,etc.,therearemanyinstancesofcollapsehappenedintheentrancezoneofthetunnelwerecausedbybiasandlandslide,extrusiondestructionoftunnelisoftencausedbyplasticpressure,androckburstoftenoccuredinhighgroundstressarea,etc.4)improperdesignandconstruction.Atpresent,“NewAustrianTunnellingMethod”isusedtodesignandconstructioninmostofthetunnel,However,thedeviationunderstandingoftheconceptandconnotationoftheprincipleledtomanyfailureinengineering.collapseoftunnelisinducedbymanyfactorsandthemechanismisofmorecomplex,therefore,impropertreatmentmeasuresforthecomplexgeologicalduringtheconstructionwilleasilycausetheoccurrenceofcollapsedisasters.1.2analysisofcollapsetypestherearemanytypesofpartitioningmethod,generallybasedonthecauseofcollapse,form,scale,mechanism,etc.itmainlyp