摘要
Areasonablestrengthcriterionshouldreflectthehydrostaticpressureeffect,minimumprincipalstresseffect,andintermediateprincipalstresseffect.Theformertwoeffectscanbedescribedbythemeridiancurves,andthelastonemainlydependsontheLodeangledependencefunction.Amongthreeconventionalstrengthcriteria,i.e.Mohr–Coulomb(MC),Hoek–Brown(HB),andExponent(EP)criteria,thedifferencebetweengeneralizedcompressionandextensionstrengthofEPcriterionexperienceafirstlyincreasethendecreaseprocess,andtendstobezerowhenhydrostaticpressureisbigenough.Thisisinaccordancewithintrinsicrockstrengthcharacterization.Moreover,thecriticalhydrostaticpressureIccorrespondingtothemaximumdifferenceofbetweengeneralizedcompressionandextensionstrengthcanbeeasilyadjustedbyminimumprincipalstressinfluenceparameterK.So,theexponentfunctionisamorereasonablemeridiancurves,whichwellreflectsthehydrostaticpressureeffectandisemployedtodescribethegeneralizedcompressionandextensionstrength.Meanwhile,threeLodeangledependencefunctionsofLMN,LWW,andLYMH,whichunconditionallysatisfytheconvexityanddifferentialrequirements,areemployedtorepresenttheintermediateprincipalstresseffect.Realizingtheactualstrengthsurfaceshouldbelocatedbetweenthegeneralizedcompressionandextensionsurface,newtrue-triaxialcriteriaareproposedbycombiningthetwostatesofEPcriterionbyLodeangledependencefunctionwithasamelodeangle.Theproposednewtrue-triaxialcriteriahavethesamestrengthparametersasEPcriterion.Finally,14groupsoftriaxialtestdataareemployedtovalidatetheproposedcriteria.Theresultsshowthatthethreenewtrue-triaxialexponentcriteria,especiallytheExponentWillam-Warnkecriterion(EPWW)criterion,givemuchlowermisfits,whichillustratesthattheEPcriterionandLWWhavemorereasonablemeridiananddeviatoricfunctionform,respectively.Theproposednewtrue-tria
出版日期
2018年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
