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1、橋梁建設(shè)2014年第44卷第4期(總第227期)22BridgeConstruction，Vo1．44，No．4，2014(TotallyNo．227)文章編號(hào)：1003—4722(2014)04—0022—05堆載作用下橋梁被動(dòng)樁偏移受力分析及處理措施馬遠(yuǎn)剛，王艷芬，陳晨。(1．中鐵大橋局集團(tuán)橋科院有限公司，湖北武漢430034；2．武漢理工大學(xué)，湖北武漢430063)摘要：為研究堆載對(duì)橋梁被動(dòng)樁的影響，以某橋?yàn)楸尘?，采用有限差分法進(jìn)行被動(dòng)樁偏移受力分析，判斷基樁能否繼續(xù)使用并提出處理措施。采用有
2、限差分法建立下部結(jié)構(gòu)模型，計(jì)算堆載作用下橋墩偏移并與實(shí)測(cè)值對(duì)比，分析基樁內(nèi)力及偏移，按圓形截面鋼筋混凝土偏心受壓構(gòu)件計(jì)算最大裂縫寬度并評(píng)估基樁狀態(tài)，根據(jù)評(píng)估結(jié)果提出處理措施。結(jié)果表明：堆栽導(dǎo)致橋墩偏移，墩頂橫向偏移計(jì)算值與實(shí)測(cè)值比較吻合；堆載作用下，基樁產(chǎn)生了較大偏移和彎矩，樁頂軸力和樁身軸力分布不均，并產(chǎn)生不同程度的負(fù)摩阻力(距堆載越近負(fù)摩阻力越大)；最大裂縫寬度為0．08mm，小于規(guī)范限值，判斷基樁可以繼續(xù)使用，提出堆載反壓和應(yīng)力釋放孔聯(lián)合糾偏，開挖卸載、水平頂推結(jié)合應(yīng)力釋放孔糾偏等處理措施。關(guān)
3、鍵詞：橋梁基礎(chǔ)；被動(dòng)樁；堆載；位移；軸力；負(fù)摩阻力；裂縫寬度；糾偏；有限差分法中圖分類號(hào)：U443．15文獻(xiàn)標(biāo)志碼：AForceAnalysisandHandlingMeasuresforOffsettingofBridgePassivePilesUnderActionofStackedLoadMAYuan-gang，WANGYan—fen，CHENChen。(1．BridgeScienceResearchInstituteLtd．。ChinaRailwayMajorBridgeEngineerin
4、gGroup，Wuhan430034，China；2．WuhanUniversityofTechnology，Wuhan430063，China)Abstract：Tostudytheinfluencesofstackedloadonthebridgepassivepiles，abridgewastakenastheresearchobject，theforceanalysisofoffsettingofthepassivepileswasconductedbythefinitedifference
5、method，thepileswerejudgediftheycouldbecontinuouslyusedandthecor—respondinghandlingmeasureswereproposed．Themodelsforthesubstructureofthebridgeweresetupalsobythefinitedifferencemethod，theoffsettingofthepiersofthebridgeundertheac—tionofthestackedloadwasca
6、lculatedandthecalculatedvalueswerecomparedtothemeasuredones．Theinternalforcesandoffsettingofthepileswereanalyzed．Intermsofthecircularrein—forcedconcreteeccentriccompressioncomponents，themaximumcrackwidthofthepileswascal—culated，theforceconditionsofthep
7、ileswereassessedandbasedontheassessment，thehandlingmeasureswereproposed．Theresultsshowthatthestacked1oadcausestheoffsettingofthepiersandthecalculatedandmeasuredvaluesofthelateraloffsettingofthepiertopsareaccordant．Un—dertheactionofthestackedload，thegre
8、atoffsettingandbendingmomentoccurinthepiles，theaxialforcedistributioninthepiletopsandpileshaftsisnotuniformandthenegativefrictionalre—sistanceofdifferentdegreesOCCURS(theclosertothestackedload，thegreaterthenegativefric—tionalresistancew
