京沪高速铁路cfg桩复合地基路基沉降预测分析

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1、西南交通大学硕士研究生学位论文第

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3、页AbstractWiththerapiddevelopmentofhigh-speedrailway,thequalityofrailwaysubgradestabilityhasbeendemandmorestringent．However,thesettlementofhigh—speedrailwaysubgradeisanimportantaspectforstabilityevaluation，especiallythefactoryafterthesettlementcontrolis

4、inverystrictcontr01．ThispaperresearchtheCFGpilecompositefoundationsettlementofsubgradeaboutthePeking-Shanghaihighspeedrailway,analyzingthetheoryofsoftsoilfoundationdeformationandtheconceptofpost—constructionsettlementrailwayroadbed；Focusonsubsidenceprediction，usingthefo

5、rmerengineeringmeasureddatatopredictthesettlementrules；Becausesubgradesettlementscaleofthehigh-speedrailwaytrackissmallandfluctuations，inordertoimprovethetraditionalhyperbolamethod，exponentialcurvemethod，combiningwiththreepointmethodtosolvetwokindsofcurvemodel．Thispaper

6、isbasedonengineeringsettlementobservationdataofthePeking-Shanghaihigh-speedrailway咖ckDK511+787～DK513+050sections．ThesubsidencepredictionresultsofDK512+625sectionshowthattheimprovedhyperbolicmethodselectionatthreetimesintervalislarger’andtheaccuracyofsubsidenceprediction

7、isbetter．Improvingtheinitialtimepointselectionintheexponentialcurvemethodbeforethesubgradefillingiscompleted，theaccuracyofsubsidencepredictionisbetterbyselectingalargertimeinterval．TheoriginaldataintheGM(1，1)greypredictionmethodshouldbechosenbeforetheroadbedfillingiscom

8、pleted，andtheoriginaldatasequenceselectingisinalargertimeinterval(theproposedintervalisbiggerthan28d)．TheoriginalsequencenumberonlyfiveCanachievegoodpredictionresults；Theallconclusionsabovewereappliedtotheothersectionofthesegment，andtheresultsshowedthatthethreekindsofpr

9、edictionmethodshavegoodapplicabilityinthesegment；ThefinalsettlementdatausingtheGM(1，1)greypredictionmethodisbetweenusingtheimprovedhyperbolicmethodandusingtheexponentialcurvemethod．ThepredictionaccuracyusingtheGM(1，1)greypredictionmodelishigherthanusingthesegmentmodifie

10、dhyperbolamethodandusingtheexponentialcurvemethod，andthereisacertainreferencevalueaboutsubsidencepredictionfor