水作用下软岩软化与损伤断裂效应的时间相依性

424Vol．42No．420107JOURNALOFSICHUANUNIVERSITYENGINEERINGSCIENCEEDITIONJuly20101009-3087201004-0055-08410083RYL－600Instron1342、、VKI、KIC、槇DVKIlgKI－lgV。。TD315ATime-dependenceofDamageandFractureEffectforStrainSofteningofSoftRockUnderWaterCorrosionWANGYi-xianCAOPingHUANGYong-hengWENYou-daoWANLin-huiLIJiang-tengSchoolofResourcesandSafetyEngineeringCentralSouthUniversityChangsha410083ChinaAbstractInordertostudythetime-dependenceofdamageanddegradationeffectforsoftrockunderwatercorrosionsubcriticalcrackgrowthofsoftrockwasstudiedbydoubletorsiontestusingInstron1342typeelectrohydraulicservotestmachineandthemechanicsparameterstestusingRYL-600rocktestmachineaftermarinatedsoftrockinwaterfordiffer-enttime．BasedontestingresultstherateofwatercontentωthemechanicsparametersthesubcriticalcrackgrowthvelocityVthestressintensityfactorKIandthefracturetoughnessKICwereobtainedrespectively．TheresultsshowedthattherateofwatercontentωVSthetimeofwater-rockinteractionrelationsaccordwithgoodlinearruleandcouldbeusedtoestablishthefunctionrelationshipofdamageanddegradationvelocity槇DforsoftrockbymeansoftherateofwatercontentωandelasticitymodulusE．Therelationshipofsubcriticalcrackgrowthve-locityVandstressintensityfactorKIofsoftrockindifferenttimewerestudiedbydoublelogarithmcoordinateandtheresultsshowedthatlgKI－lgVrelationsaccordwithgoodlinearruleandthefracturemechanicseffectofwatercor-rosionactionofswellingsoftrockisevidentandtime-dependentandthewatercorrosiondamagecanacceleratesubcriti-calcrackgrowthvelocityVandcanweakenfracturemechanicalcharacteristicofswellingsoftrock．Keywordssoftrockwater-rockinteractiondamagedegradationtime-dependentswelling2009－09－235074409310972238CX2009B0462009ybfz0613437433400002409MX141980－．、[e-mail]、、、。、。、1－7。、、pH、、、8～14。、、。11．115。、、、、。。、、16－17、σ、。。、＞20%、。pH1、521～7。1Tab．1TheresultofhydrochemicalanalysepH/mg·L－1/mg·L－1K++Na+Ca2+Mg2+Cl－SO2－4HCO－7．653．0976．266．3819．2730．18190．032Tab．2Thebasicparametersofrocksindifferentsoakingtime/dω/%σc/MPaE/GPaμ0052．62512．2310．23311．13146．32911．7910．24842．09840．04210．2780．26683．09634．8809．2040．278123．98630．1028．3870．291154．36928．3957．6810．304204．64625．5317．3430．315304．88622．8657．0400．3221Fig．1Thecurvesofωandtforrocks65422Fig．2Thecurvesofεandtfortypicalrockspecimen3Fig．3Thecurvesofsandtfortypicalrockspecimen4Fig．4ThecurvesofEandtforrocks5Fig．5Thecurvesofμandtforrocks1．2110～4dω4～15dω6Fig．6Thecurvesofσυandtforrocks7Fig．7Thecurvesofωandσυforrocks15～20d2～52d15d2、15～20d20d2317d25d4～54E5μ0～20d20d60～20d。7754y=－5．84x+52．774R2=0．99531FttFt=fωσEμ2Fttt槇D槇D=dFtdtt∈04d4d15d15d20d20d30d{33槇Dtt。FtFtFt槇D。dTaylorTaylorHorb-sonCLI2000TaylorHorbsonCLI2000d8。8。80～192h5μmT=0～192h5d8。d。。8Fig．8Thechangeofrock-swellingindifferentsoakingtime、、、。0～4d、4～158542d、15～20d20～30d。。22．1、、。9。9Fig．9ThesketchofdoubletorsionspecimenInstron13429。2．2。pH=7．65。180mm×60mm×4mm1mmd/3。10mm1mm。0．025mm18－1910。10Fig．10ThepartofdoubletorsionspecimensMckinneyKI=Pwm31+νwd3dn槡ξ4ξξ=1－5d4w。4w/d＞13KI7%15∶1～12∶1。T=0hT=48hT=96hT=144hT=192h。0～192h。2．3。。K0．9Al2．9Si3．1O10OH2+nH2→OK0．9Al2．9Si3．1O10OH2·nH2O55、。954。。VKI、KIC。9。θ20θ=ywm=6Tawd3G6ywmTT=Pwm2PGadw/2。CC=yP=3w2mawd3G7gC21g=P22dCdA=P22dndCda8Adn。7a8g=3P2w2m2wd3dnG9KIg21KI=Eg1210G=E21+vKI=Pwm31+vwd3dn121111、。PPCKIPmdn12KICKIC=PCwm31+vwd3dn12127B=3w2mwd3G=6w2m1+vwd3Ey=PBa1313tdydt=Badpdt+BPdadt14dydt=0dadt=－aPdpdt1513a=yPB=wd3Ey6w2mP1+v161615V=dadt=wd3Ey6w2mP21+vdPdt1717。。PCPmKIKICKIC。KIC=Pm·wm31+μ/wd3dn槡182．4。0．5～5．0mm/minViP119。ytP211。KIKICKI＜KICKI21。064211Fig．11Theparttypicalcurvesofdoubletorsiontest3～512。3Tab．3Theregressionresultsofsubcriticalcrackgrowthindifferentsoakingtime/ha1b1R110－12．84157．2130．95837248－9．76656．9620．95494396－7．78652．7260．951864144－4．61747．9560．948935192－2．29647．4590．93482lgv=a1+b1lgKI4Tab．4Theparametersofsubcriticalcrackgrowthindif-ferentsoakingtime/hAnPC/N101．44×10－1357．213150．422481．71×10－1056．962148．313961．63×10－852．726141．6941442．41×10－547．956130．3151925．05×10－347．459125．695KICK0Tab．5TheKICandK0indifferentsoakingtime/hK0/MN·m－3/2KIC/MN·m－3/2K0∶KIC00．8971．3381．6680．802480．8981．3211．7170．769960．8901．2811．6060．7981440．8981．1661．3950．8361920．8961．1481．4250．806lgv=a1+b1lgKI19KIvCharles22v=A·KnI2012lgKI－lgVFig．12ThecurveoflgKI－lgVindifferentsoakingtimen=b1A。An。3～5。12KI、VlgKI－lgV、、。lgKI－lgV。31。2Ft。3。4lgKI－lgV。1641CuiQiangFengXiatingXueQiangetal．Mechanismstudyofporositystructurechangeofsandstoneunderchemicalcor-rosionJ．ChineseJournalofRockMechanicsandEngi-neering20082761209－1217．．J．200827612091217．2FengXiatingLiShaojunChenSili．Effectofwaterchemi-calcorrosiononstrengthandcrackingcharacteristicsofrocksJ．KeyEngineeringMaterials2004261－2631355－1360．3MasahiroSVenkataSDilipKetal．TheeffectofchemicaladditivesonthestrengthofrockC//RockMechanics98．s．l．JapaneseCommitteeforIRSM1998201－210．4JingZZKimioWJonathanWetal．A3Dwater/rockchemi-calinteractionmodelforpredictionofHDR/HWRgeothermalreservoirperformanceJ．Geothermics2002311－28．5ChenSiliFengXiatingZhouHui．Studyontriaxialmeso－failuremechanismanddamagevariablesofsandsto