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a(,230027)Terzaghi(R=RG+P),,;(U),;,,:R=UP+(1-U)RG;U,.Terzaghi,.,(),.,,().(R),(RG),(P).RP,RG.,;,RG,RP.,RPRG,,RRGP,.TerzaghiRRGP[1],1TerzaghiAACRRCPFig.1SketchofstressesforTerzaghiequation[24].,.,,.1Terzaghi1923[1]:R=RG+P(1)(1),;,Terzaghi6219986JOURNALOFBASICSCIENCEANDENGINEERINGVol.6,No.2June1998a1998204210,1998206209,(1).Terzaghi1[1,5].1,:R=aRC+(1-a)P(2),a=ACöA,A,AC,RC.a,aRCRG,1-a1,(2)(1),Terzaghi.Terzaghi.1R,,.,,2R.RC,,,,.a,(),.(1)(P),(RRG),,.(1)R=P,RG=0.,.,P,,RG=P.:Terzaghi.2.,().,().:.(U).,().OO(2),A(),R,RG(),,:RA=PUA+RG(1-U)A(3),AR,UAP,(1-U)ARG.(3):R=UP+(1-U)RG(4)(4),.R,UP,(4)RG,.3.D:641Vol.62ARRGPFig.2SketchofstressesinporousmediaR=QrgD+Pair(5),Qr=UQ1+(1-U)QG,;Q1;QG;Pair.,D:P=Q1gD+Pair(6):RG=QGgD+Pair(7)(5)(7)(1),;(4),.D=0,,R=RG=P=Pair,(1),;(4).U0,,(4):R=RG(8)U1,,(4):R=P(9),(4),,.(1).,(),.(4).(1):RGFR(PE0).(4).2:RPRG,PER,RGFR;PFR,RGER,.(1)RGFRPFR,,.,,.Terzaghi(4).4[3,4].:R(),P()RG.U=0.2,R=20MPa,P=10MPa,(1)RG=10MPa,(4)RG=22.5MPa.(4)(1).5Terzaghi,,(4)..(4),.741No.2:,,.1JaegerJC,CookNGW.Fundamentalsofrockmechanics(3rdEdition).London:Chapmanandhall,19792DakeLP.Fundamentalsofreservoirengineering.ElsevierScientificPublishingCompany,19783,,..:,19904..:,19925J..:,1983ANewEquationofStressesinPorousMediaLIChuanliang(DepartmentofModernMechanics,UniversityofScienceandTechnologyofChina,Hefei230027)AbstractTerzaghiequation(R=RG+P)isaclassicalone,whichdescribestherela2tionshipbetweenstressesinporousmedia.Terzaghidefinedtwoimmeasurablevariables,sotheequationisnotpracticallyapplicable.Andalso,theequationdoesnotincludethemostimportantparameter(U)describingthecharacteristicofporousmedia,soitisincorrect.Thispaperhasaccomprtantatheoreticalresearch,andestablishedanewequation:R=UP+(1-U)RG,whichcansatis2fytherelationshipofstressesinporousmediaandovercomethecontradictionshowedbyTerzaghiequationindealingwithpracticlproblems.WithUbeingincorporated,thenewequationperformsverywellwhileitappliestoporoumedia.Keywords:Terzaghiequation,porousmedia,grainstress841Vol.6