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Direct tension test for rock material under different strain rates at quasi-static loads.pdf

Direct tension test for rock material under different strain rates at quasi-static loads.pdf

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时间：2019-03-04

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1、RockMechRockEngDOI10.1007/s00603-013-0406-7TECHNICALNOTEDirectTensionTestforRockMaterialUnderDifferentStrainRatesatQuasi-StaticLoadsHaiboLi•JianchunLi•BoLiu•JunruLi•SiqiLi•XiangXiaReceived:12October2012/Accepted:22March2013ÓSpringer-VerlagWien201314KeywordsDirectdynamictensi

2、ontestBraziltestlimestoneatloadingratesfrom10to10MPa/s.TheDynamictensilestrengthStrainrateSideconfinementtensilestrength,theYoung’smodulusandthefailurestrainfortherockwerereportedtoincreasewiththeincreaseoftheloadingrate.Thethree-pointbendingandBraziltestmethodswereemploy

3、edtostudythedynamictensile1IntroductionpropertiesforBukitTimahgranitebyZhaoandLi(2000).TheyfoundthatthetensilestrengthofgraniteobtainedbyMechanicalpropertiesofrockmaterialunderdynamicthetwomethodsisconformablyincreasedwithincreasingtensionareimportantinevaluatingthedamagecha

4、racter-loadingrate.Whentheloadingraterisesbyoneorderfromisticsofrockstructuressuchasrockcaverns,rockslopesas1410to10MPa/s,theincrementofthetensilestrengthiswellasrockfoundationsfollowingexplosionorearth-about10%.Inaddition,thetensilestrengthoftherockbyquake.Inthisarena,since

5、the1960s,manyexperimentalthethree-pointbendingmethodwastestedtobe2.5timesworkshavebeenconducted.Amongtheseworks,indirectthatobtainedfromtheBraziltestmethodatthesamedynamictensiletestmethods,suchastheBrazilandtheloadingrate.splitHopkinsonpressurebar(SHPB)testmethods,wereBased

6、onSHPBtestsforquartzmonzoniterock,mainlyemployedtostudythestrengthanddeformationBirkimer(1971)pointedoutthatthedynamictensilepropertiesofrockmaterialunderdynamictension.strengthoftherockincreaseswithacuberootofthestrainForexample,throughdynamicBraziltestsfordolerite14-1ratew

7、henthestrainraterangesfrom10to10s.Byandlimestone,PriceandKnill(1966)suggestedthattheSHPBtests,Choetal.(2003)studiedthevariationofthetensilestrengthofbothrocksgenerallyincreaseswiththetensilestrengthforInadagraniteandTagetuffatstrainincreaseoftheloadingrate.Fordolerite,theten

8、sile-1ratesrangingfrom1to10s.Itwasindicatedthatthestrengthatthehighestloadi

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