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时间:2019-11-24
《脆性岩石变形机制与渗透率关系研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、2012年12月,第l8卷,第4期,719—723页高校地质学报December2012,Vo1.18,N0.4.P.719-723GeologicalJournalofChinaUniversities脆性岩石变形机制与渗透率关系研究张蕊,姜振泉,孙强,徐松山21.中国矿业大学资源与地球科学学院徐州221116;2.中南大学地学与环境工程学院长沙410083摘要:为研究脆性岩石变形机制与渗透率一应变的关系,根据脆性岩石应力一应变和渗透率一应变关系曲线分析指出:脆性岩石经压密、弹性变形和非稳定破裂后,内部微裂隙
2、出现丛集式发展,且不断合并、贯通,导致微观结构发生明显变化,使渗透率在临界破坏点处急剧增大;当岩石宏观破坏后,内部结构面上的岩桥或凸起体部分被剪断或磨平,使得岩石强度随变形突然下降,此时渗透率到达峰值。结合重整化群理论分析表明,脆性岩石在应力一应变曲线拐点处应变和渗透率峰值点处应变对应、临界破坏点处应变和渗透率急剧增大点处应变对应。通过试验研究和实例统计分析,验证了结论的合理性。关键词:脆性岩石;变形机制;渗透率;临界破坏点;重整化群理论;峰值点中图分类号:TU452文献标识码:A文章编号:1006—7493(
3、2012)04—0719—05StudyontheRelationshipoftheBrittleDeformationMechanismandPermeabilityofRocksZHANGRui’,JIANGZhenquan’,SUNQiang’,XUSongshan1.SchoolofResourcesandEarthScience,ChinauniversityofMiningandTechnology,Xuzhou221116,China;2.SchoolofGeosciencesandEnviron
4、ment,CentralSouthUniversity,Changsha410083,ChinaAbstract:Inordertostudytherelationshipofthebrittledeformationmechanismandpermeabilityofrocks,thecuiTesofstress—strainandpermeability-strainofrockswereanalyzed.Theresultsindicatethatthepermeabilityofrocksincreas
5、esrapidlyatthecriticalfailurepointbecauseofthesignificantchangesofthemicrostructurethatresultedfromtheclustergrouping,mergenceandtransfixionoftheinternalmicrofissurewiththecompaction,elasticdeformation,andprogressivefailure.ThepeakpermeabilityiSreachedwhenas
6、uddendecreaseofrockstrengthwiththedeformationoccurs,buthasacertainresidualstrengththatmaybecausedbytherockbridgesorasperitiesontheinternalstructuralplanewhicharerupturedpartiallyorcompletelyaftermacroscopicfailurebehaviorofrocks.Thestrainatthecriticalpointan
7、dturningpointonastress—straincurvecanbeanalogizedasthosecorrespondingtothestrainattherapidlyincreasedpointandthepeakpointonthepermeability—strainCuYveaccordingtotherenormalizationtheory.Theconclusionsarereasonablebytheexperimentalstudiesandexamplesofstatisti
8、calanalyses.Keywords:brittledeformationmechanism;permeability;criticalfailure;renormalizationgrouptheoryFirstauthor:ZHANGRui,Ph.D.candidate;E—mail:zhangruian5566@163.com收稿日期201卜06—06;修回日期:2011-I
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