岩石流变扰动效应试验及其本构关系研究

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1、第27卷增1岩石力学与工程学报Vol.27Supp.12008年6月ChineseJournalofRockMechanicsandEngineeringJune，2008岩石流变扰动效应试验及其本构关系研究高延法，肖华强，王波，章延平(中国矿业大学，北京100083)摘要：深井软岩条件下的巷道围岩流变变形较大，且对扰动作用十分敏感，由扰动作用引起的变形不可忽略。提出岩石强度极限邻域、岩石流变扰动效应等岩石力学新概念，得出岩石处于强度极限邻域范围内时，扰动效应具有显著作用。研制岩石流变扰动效应试验仪，进行岩石流变及其扰动效应试验。试验测试岩石在其强度极限邻域内的恒定轴向

2、荷载作用下，对岩石试件进行扰动荷载冲击扰动，得出不同蠕变阶段具有的扰动效应，绘制不同蠕变阶段的扰动次数–累积变形曲线。根据试验成果，分析岩石蠕变扰动效应的影响因素，建立蠕变不同阶段扰动作用条件下在的岩石本构方程。关键词：采矿工程；深井地压；岩石流变；扰动效应中图分类号：TD34文献标识码：A文章编号：1000–6915(2008)增1–3180–06ARHEOLOGICALTESTOFSANDSTONEWITHPERTURBATIONEFFECTANDITSCONSTITUTIVERELATIONSHIPSTUDYGAOYanfa，XIAOHuaqiang，WANGBo

3、，ZHANGYanping(ChinaUniversityofMiningandTechnology，Beijing100083，China)Abstract：Largerheologicaldeformationofsofteningsandstoneatgreatdepthisexclusivelyassociatedwithperturbation.Andthestudyofrockrheologyanditsperturbationeffectbecomesespeciallyimportant.Twonewconcepts，limitneighborofroc

4、kstrengthandperturbationeffectofrockrheology，areproposed.Anexperimentalresultisobtainedthattheperturbationeffectisobviouswhentherocksampleisinthescopeoflimitneighborofrockstrength，whichindicatesthattherockrheologyanditsperturbationosculatewiththerock′sstraincondition；andtheperturbationef

5、fectissensitivetothelimitdeformation.Withtheconceptoflimitneighborofrockstrengthandperturbationeffectofrockrheology，analternativeexperimentalinstrumentisdevelopedforstudyingsuchaperturbationeffect，anditisalsousedtotestsomesandstonesamplesundertheconditionsofconstantaxis-loadsatdifferentr

6、heologicalphases.Someperturbationtimeandcumulativedeformationcurveofsandstonerheologyatdifferentphasesareachievedforstudyingtheruleofrockrheologyanditsperturbationeffect.Finally，thefactorsofperturbationeffectandarheologicalconstitutiveequationforsandstoneatdifferentrheologicalphasesarepr

7、esentedtosimulatetheperturbationeffect.Theconstitutiveequationcanbeusedtocalculatetherheologyanditsperturbationincrementofthesamerock；andthestabilityofsurroundingrockcanbeanalyzed.Keywords：miningengineering；groundcompressionatgreatdepth；rockrheology；perturbationeffect收稿日期