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岩土力学 2009
深埋隧道开挖围岩失稳突变模型研究Keywords: tunnelsurroundingrock,catastrophetheory,model,instability,vaultsettlement Abstract: byanalyzingsurroundingrockinstabilitycausedbytunnelexcavation,surroundingrockinstabilityofdeep-buriedtunnelsisconsideredasasuddenfailurephenomenon,whichpossessesnonlinearityanddiscontinuityobviouslyandshowstheuncertaintyofmechanicaldeformationproperty,nonlinearityofconstitutiverelationshipandcatastropheoffailureprocess.basedonthetotalpotentialenergyprinciple,thecuspcatastrophicmodelforinstabilityandfailureofdeep-buriedtunnelsurroundingrockisestablished.throughtheobserveddataofsettlementvaluesoftypicalsectionvaultofdeep-buriedtunnelandthesuddenthresholdvaluesofdisplacementofeachmonitoringsection,thevariablevaluesofvaultsettlementfunctionareobtained,andthestabilityofdeepsurroundingrockintunnelisdecided.theresultaccordswithsurroundingrockofpracticalconstruction,itnotonlyoffersreferencesforpreventinginstabilityandfailureofdeep-buriedtunnels,butalsogivesanimportantguidanceforreasonableconstructiontechniqueofsupportingmeasures.
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