危岩主控结构面损伤—流变—断裂复合机理与稳定寿命研究

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1、分类号P§4221Q34§密级论文题目V856811单位代码!!i!!学号03340202重庆交通大学硕士学位论文研究生姓名危岩主控结构面损伤一流变一断裂复合机理与稳定寿命研究ResearchonDamage-Rheology＆FractureCompoundMechanismandStabilityTimeofControlFissureinPerilousRock胡明导师姓名、职称：陈洪凯教授博导申请学位级别专业名称：唐红梅副研究员硕士水工结构工程论文答辩日期：2006年4月8日学位授予单位：重庆交通大学答辩委员会主席；许江教授、博导评阅人：张永兴

2、教授、博导2006年4月1日刘东升教授、博导ABSTRACTPedlousrock，asoneofmaingeologicdisastersintheworld，hasbeendefinedastheunstablerockblockwhichalsol{)catsinthesteeDoreliffandbesurroundedbyrockfissures．Tllcreareabout50thousandperilousrocksintheareaoftheThreeGorgesreservoirandtheyareconsideredasabigth

3、reattoabout200thousandpeople'slifeandbillionsofdollars．Intheresearchsystemonthemechanismofdevelopmentofperilousrock，crackpropagationofcontrolfissureplayakeyroleandit’sdamage—rheology＆fracturecompoundmechanismisthoughtofthebasicsofstudyforstrengthparameter．Basedontheformerfi'uit，

4、thispapermake缸'therresearchesintothedamage-rheology&fracturecompoundmechanismofcontrolfissureinperilousrockandgetsomeresultsasfollowing：(1)Thepaperdealswiththedamageareaofcontrolfissuretip，whichdividedintocontinumdamageareaandlocaldamagear髓．Ageometricaldamagemodelhasbeenproposed

5、intheparticulararea．Somedamageevolutionandconstitutiveequationsaregiven．Morethanthis，anrheology-damagemodelthataccommodatesthespecialneedsofdamage，showssomeadvantagesinsimulatingthetheologycharacterofrocks．Thecontrastcurveofinterrelatedcalculatedresultsandcreeptestproveit．(2)Arh

6、eology-damage-fractureconstitutivemodelhasbeenproposedinthecontinumdamageareaandsomecomplexfunctionisusedtoanalysetheStl'璐Sbounds．Fromthemodel，ahalf-analyticexpressionCanbesolvedthroughiterativeoperationbymicrostepandtheresultsshowssomereasonable．(3)Tllcpapergivessomecomparative

7、analysistoseveraldifferentstyleofperilousrocks(suchaspressure·-shear,tension-shear,tension-pressure--shear),andpaymoreattenliontothatthetransfixionornotofcontrolfisSllreaffectthemodelofcrackpropagation．Thewildgoosetypecrackdoeswellinsimulatingthecontrolfissureofuntransfixion,and

8、mechanismofbranchcrackdevelopingandpropagatingi