循環(huán)荷載作用下軟粘土地基桶型基礎(chǔ)變形的計(jì)算研究.pdf

1、天津大學(xué)碩士學(xué)位論文循環(huán)荷載作用下軟粘土地基桶型基礎(chǔ)變形的計(jì)算研究姓名：劉錕申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：巖土工程指導(dǎo)教師：王建華20070101ABSTRACTNowadays，bucketfoundationshavebeenappliedmoreandmoreextensivelyintheoffshoreengineeringduetotheirsuperiorities，butthereisstillnotagoodmethodto

2、evaluatecyclicbearingcapacitiesofbucketfoundationsinsoftclayInthispaperthemethodbywhichcyclicaccumulativedeformationswereequaledtOcreepsWasstudiedtocalculatedeformationsofbucketfoundationsinsoftclayundercyclicloads，andbe

3、aringcapacitieswereevaluatedbydeformationcalculationsFirstly，failurecharactersofbucketfoundationswerestudiedbyaseriesofbucketfoundationmodeltestsThepreparationofthesoiltank，thepenetrationofmodelbucketandcyclicloadingtest

4、swereintroducedinthispaperDeformationsofbucketfoundationsunderstaticandcyclicloadswereobtainedbymodeltests，andresultsoftestsshowedthatcyclicaccumulativedeformationsweresimilartocreeps，whichprovidedareferencetocalculation

5、sofdeformationsSecondly，therelationshipbetweencyclicaccumulativestrainsandtheirrelativefactorswasestablishedInthispaperunconsolidatedundrainedcyclictriaxialtestsofthesoilusedinmodeltestswereconductedunderdifferentstatica

6、ndcyclicloadstostudycharactersofcyclicaccumulativestrainsAndtherelationshipwasestablishedamongstrains，cyclicstresses，staticstressesandthenumbersofcyclesFinally，modeltestsweresimulatedusingthefiniteelementmethod，anddeform

7、ationsofbucketfoundationsunderstaticandcyclicloadswerecalculatedusingtheequivalentmethodDeformationsproducedbydifferentcyclicloadsundersamestaticloadsatthesamenumberofcycleswerepickedupfromcalculatingresultsThencyclicbea