雙軸壓縮下含閉合裂紋有限巖板的斷裂研究.pdf

1、中南大學(xué)碩士學(xué)位論文雙軸壓縮下含閉合裂紋有限巖板的斷裂研究姓名：楊慧申請學(xué)位級別：碩士專業(yè)：工程力學(xué)指導(dǎo)教師：曹平20070515中南大學(xué)碩士學(xué)位論文ABSTRACTThereisalittleresearchonthecompoundfracturecriteTionofcrackclosurestaterelativelyClosedcrackintherockplatesisaspecialpureⅡcrackessentiall

2、y髓epaperwhichbasedonfiacturemechanicsstudiedtheinclinedcracktipstressintensityfactoroftherockmassanditsfracturecriterioninthetheoreticalanalysisandnumericalcalculation羽kcontentsincludedthreeaspectsasfollows：(1)Onthebasis

3、ofcalculationshearstressfactorofinfinitewidthplatewithallinclinedcrackfomulaofthecracksbapeinfluencingfactoroftheinclinedclosedcrackinthefiniterockplateswasdedusedConsideringdifferentfrictioncoefficientsbetweenthe1聊盯andt

4、helowersurfac宅ofclosedcrackwecalculatedthecrack卸stressintensityfactorofpureIIcaack(2)AdoptingANSYSfiniteelementanalysissoRwarcbuiltthefinitedement2DmodeloftherockplateswithaclosedcrackanddeterminedclosedcracktipSlTessint

5、ensityfactorindifferentangle’Scrackandindifferentl髓gth’Sclosedcrackandcomparedwiththeanalyticresults(3)Foundtherelationshipofcracktipstressintensityfactorofinclinedclosedcrackbetweentherockplatesunderuniaxialcompressivel

6、oadingandunderbiaxialcompressiveloadingbuilttheminilnunltwinshearstresssummationfracturecriterioninsame％lineofinclinedclosedcrackconsideringfrictionaleffectandidentifiedtheangleforIImodefractureinitiationKeywordsclosedcr