悬臂式挡土墙离心试验与分析

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1、万方数据西南交通大学硕士研究生学位论文第1I页1．5倍左右，说明实际挡墙随着墙高的增加，顶端位移的增加是非线性大幅度增加的，这也说明在设计挡墙时墙高达到一定值(此表中为7．5m)后，其位移会有大幅增加的趋势。关键词：悬臂式挡土墙；离心模型试验；数值分析；位移；土压力；万方数据西南交通大学硕士研究生学位论文第1II页AbstractWiththetrendofheavyloadandhigh-speedrailway，railwaylinehasbeengivenalargeradiuscurvesandstraightlines．Usingretainingstructu

2、rehasbecomeaIlinevitableprocessofrailwaybuildingfortheconservationoflandresources．Cantileveredretainingwallarewidelyusedbecauseofsmallthickness，lightweightandgoodeconomicindicators．Thesafetyofthecantileverretainingwalldesignlargelydependsontheanalysisofthecalculationofearthpressure．TheCou

3、lombmethodnowusedinthecalculationofearthpressureadoptedmanyassumptions．what’Smoremanybuiltstructuredidn’tgettheactivelimitstate．Sothiskindofmethodisjustokforthedesignofthecommonrailwaybutastherailwayisbecomingspeedierandmoreheavy,thetheoryofcalculatingearthpressureshouldberesearchedin-dep

4、th．Onlythroughthatwecouldmaketheearthpressureandthedisplacementofthecopingclearandmaketheretainingstructuresaferandeconomic．ThispaperispartoftheresearchonRailwaysubgradeRetainingstructurelimitstatemethodbyMinistryofRailways．Theresearchofcantileverretainingwallwhichiswidelyusedinretainingw

5、allsofrailwaybasedonthecentrifugalmodeltestofdifferentloadsanddifferentwallheights．Thisresearchrevealsthevalueoftheearthpressure、earthpressuredistributionandthedisplacementofthewall．(1)Comparingthemetricalvalue诚ththenumericalvalue，wegettheearthpressuredistributionundertheconditionofsmooth

6、heelwallboard．Cantileverretainingwallearthpressuremeasuredvaluesaregreaterthanthetheoreticalvalue．TheratioofthemeasuredvalueandthecalculatingvalueunderRankineearthpressuremethodisrecommendedof1．25．TheratioofthemeasuredvalueandthecalculatingvalueunderCoulombcalculationmethodisrecommendedof

7、1．32to1．39．(2)ByANSYS(numericalanalysissoftware)，geRingthetrendofwallbackearthpressureissubstantiallythesame，approximatelytriangulardistributionunderthe万方数据西南交通大学硕士研究生学位论文第1V页conditionsofdifferentwallheightandloading．Thenthe6mhighretainingwallpressureattheupper-line