地应力测量的应力恢复法试验和数值模拟研究

263Vol.26No.319997JOURNALOFCHENGDUUNIVERSITYOFTECHNOLOGYJul.1999[]100529539(1999)0320287204a(,610059)[],,,,,[];;;[]TU459.4[]A1203050,,50,,,:,1.1,,,,2:,,,,,,,,,,1.2,X()Z()45E0,E45,E9050mmDZ22A,50mm,E0,E45,E90,,,Rx,Rz,:RxRz=AFSpöA(1),F(MPa);Sp(cm2);A;A(cm2),,,A,,,a[]1999203201[],,1967,,.©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.250mm,,,pvökgpv,(EL),Rv=pvöAv(Av)Rv,,,phökg,EL,ph,Rh=phöAh(Ah=16.5cm2)Rh,,,350mm,Rv-Rh(1),Rv=1.0613Rh+7.9568,r=0.99885,A(RvöRh)=1.321Rv2RhFig.1VariationrelationbetweenRvandRhy=1.0613x+7.9568,r=0.997733.1(),(1),,2a450,1441;b910,28771Table1Coremechanicalparametersusedinthefinite2elementmumericalmodelingöMPaöMPaö()ökNm-3650000.26164930.003.2,,;,3Rv=31MPaRv=46MPa,syRh2Fig.2Finiteelementcomputationmodule3,();,A,A=1.25,5.3%,3.3,,,,43.4,,5,6,,3.5,,,:5cm5cm,Rv,(X,Z,XZ),RvZ,RvöRvB(RvöRv)2,88226©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.3syFig.3Variationofverticalcentercress2sectiondisplacementincomputationmoduleh4Fig.4Relationbetweenstressequivalentcoefficientandcorediameter5Fig.5RelationbetweenstressequivalentcoefficientandelasticmodulesB2Rv7,Rv()30MPa,1.01.4,,,Rx,Rz:RxRz=ABFSpöA(2)6Fig.6RelationbetweenstressequivalentcoefficientandPoissou’smodules7B2RvFig.7VariationofB2RvunderdifferentconfiningpressuresB2BTable2VariationofBunderdifferentconfiningpressuresöMPa102030B1.21061.30431.3879823:©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.4,3,,5,2,,3Table3Fieldmeasurementresultsofquadraticstressfieldinsurroundingrock(EL)E0E45E90RxöMPaRzöMPaBS0K262+7401.4m2376913.918.29BS1K262+4611.5m275122248.737.34BS2K262+4441.5m908.9BS2K262+444.51.5m1107.26BS3K262+2981.5m1552955007.3514.84BS4K261+9401.5m480103481514.4440.12BS5K261+9051.5m700655136527.6441.46BS6K261+7601.5m295112890312.328.59BS7K261+7011.5m2051852109.820.62[][1].[M].:,1993.[2],,,.[M].:,1986.[3].[M].:,1984.[4],.[M].:,1991.[5],,.[M].:,1994.[6],.[M].:,1987.[7].[M].:,1994.[8],.[M].:,1991.[9].[M].:,1993.STUDYONSTRESSRESTORINGANDNUMERICALMODELINGINGEO-STRESSMEASUREJinXiaoguang,WangLansheng,LiTianbin(ChengduUniversityofTechnology,China)Abstract:Thispaperpresentsanimprovedstressrestoringmethodbasedonthebasicprincipleofthehis2toricalstressrestoringmethod,obtainedtheimprovedstressrestoringmethod’skeycoefficient-stresse2quivalentcoefficientandmakesinspectionutilizingnumericalmodeling.Atthesametime,thepaperanaly2sesitsaffectingfactoranddegree,andit’sfeasibilityandrightnessweretestedbyfieldpractice.Ithasim2portanttheoricalandpracticalvalue.Keywords:stressrestoringmethod:numericalmodeling;stressequivalentcoefficient;cofiningpressureaffectingcoefficient09226©1995-2003TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.