共面闭合非贯通节理岩体贯通机制和破坏强度准则研究

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1、第25卷第10期岩石力学与工程学报Vol.25No.102006年10月ChineseJournalofRockMechanicsandEngineeringOct.，2006共面闭合非贯通节理岩体贯通机制和破坏强度准则研究1，2，31，2刘远明，夏才初(1.同济大学岩土工程重点实验室，上海200092；2.同济大学地下建筑与工程系，上海200092；3.贵州大学土木建筑工程学院，贵州贵阳550003)摘要：简述共面闭合非贯通节理岩体的破坏机制及其贯通强度依赖于节理和岩桥的特性，阐述现有的共面闭合非贯

2、通节理岩体的强度准则及其不足。研究直剪应力状态下共面闭合非贯通节理的受力特点，提出共面闭合非贯通节理岩体破坏机制，引入起裂角，在此基础上建立含起裂角的共面闭合非贯通节理岩体贯通破坏强度准则。通过与前人的试验进行对比，结果表明提出的破坏机制能较好地解释试验现象，理论计算的峰值强度与试验实测值吻合较好。关键词：岩石力学；节理岩体；直剪；起剪角；破坏强度；共面闭合非贯通节理中图分类号：TU45文献标识码：A文章编号：1000–6915(2006)10–2086–06STUDYONFRACTUREMECHAN

3、ISMANDCRITERIAOFFAILURESTRENGTHOFROCKMASSCONTAININGCOPLANARCLOSEDISCONTINUOUSJOINTSUNDERDIRECTSHEAR1，2，31，2LIUYuanming，XIACaichu(1.KeyLaboratoryofGeotechnicalEngineering，TongjiUniversity，Shanghai200092，China；2.DepartmentofGeotechnicalEngineering，TongjiU

4、niversity，Shanghai200092，China；3.SchoolofCivilEngineeringandArchitecture，GuizhouUniversity，Guiyang，Guizhou550003，China)Abstract：Rockmassescontainingcoplanarclosediscontinuousjointsarecommonlyfoundinnature，andtheirfailuremechanismandstrengthstronglydepen

5、donthepropertiesofjointsandrockbridges，whicharedefinedastheareasbetweenjoints.Severalshearfailurecriteriaoftherockmassareviewedandcompared，andtheirweaknessesarepointedout.Themechanicalbehaviorsofbrittlerockmasscontainingcoplanarclosediscontinuousjointsu

6、ndershearconditionareanalyzed，andthefailuremechanismsoftherockmassareproposed.Therockmassmayfailinthreeways，failureintension，failureinshear，andfailureinmixedtensionandshear.Amodifiedcriterionoffailurestrengthoftherockmassisproposedforfailureinmixedshear

7、andtension.Theequationoftheshearstrengthcontainsthepropertiesofgeometryandmechanicsofjointsandrockbridges.Shearinitiationangleasanewparameterisintroducedfirstlyandalsoiscontainedintheequation.Thefailuremechanismcanexplainthephenomenonindirectsheartest，a

8、ndthecalculatedresultsaccordingtothemodifiedcriterionoffailurestrengthagreewellwithexperimentalresults.Keywords：rockmechanics；jointedrockmass；directshear；shearinitiationangle；failurestrength；coplanarclosediscontinuousjoints收稿日期：2