南昆线猪场5号大桥线路病害监测与主要影响因素分析

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1、西南交通大学硕士研究生学位论文第1I页在桩基下卧层达不到上部结构承载力要求的条件下，当下卧层力学性质有差异时，承台产生差异沉降和应力集中效应。最后根据病害监测结果和基础补勘分析结果，综合三维数值仿真分析结果等因素，确定南昆线猪场5号大桥线路病害的主要影响因素有两个方面：①桥梁基础地质问题；②圆曲线线路平均半径小于设计值，以及线路几何形态不良。其他一些次要因素也应该引起足够注视，避免其从量变到质变的发展，确保线路长期行车安全。关键词：线路病害；变形监测；地质勘探；溶洞；数值模拟；ABAQUS-厂’’-‘I■■厂西南交通大学硕士研究生学位论文第1II页AbstractT

2、he5mbridgeofNanning—KunmingrailwaylineinZhuchang，stillaccordingtotheold80’sbuildingdesignandconstructionspecifications，wasbuiltin1993andcompletedin1996．Withtherapiddevelopmentofsociety，sixtimesofraisingtrainspeedhavebeencarriedoutandheavyrailhasalsomadetremendousgrowthandimprovement，wh

3、ichimpactedtheusing5mbirdgesignificantly，andthecomplexgeologicalandhydrologyenvironment，combined埘tllvariousnaturalfactors，increasedthediseaseprobabilityoftheservingfoundation-bridge·linesystem．Diseasesaspiersettlement，lateraldisplacementofthebridgestructure，titledhingedmovablesupport，s

4、ubsidenceandcrackoftheconeslope，concretecrackandabscisic，railcreepdeformationandovercantofthelineseriouslyaffectedtheoverallstabilityandlifetimeoftheserving5mbridge，aswellasthesmoothnamingofvehiclesandeventhetreatentrafficsafety．Firstly，takingthediseasesof5mbridgeasthebackground，thedom

5、esticandinternationalsituationofbridgerailwaylinediseaseswerefullystudied，thevariouscausesofthe5mbridgerailwaylinewerecomprehensivelyanalyzed，accordingtothediseasecharacteristicsandgeographicalenvironment，basedonhigh-precisionmeasuringinstrumentsandsensors，ascientific，systematicandecon

6、omicsystemofrailwaylinediseasemonitoringwasformed，andtheprismforcedplumingpolegreatlyenhancedtheaccuracyandefficiencyoftherailwaylinplatemeasurement．Throughlong—termmonitoringofthe5mbridgerailwaylineinZhuchang，thedevelopmentlawofthelinediseasewasobtained，thepiershadthetrendofsettlement

7、andtilt，thetiltangleofthehingedmovablesupportswerelargeandpartsofthemhadthetrendofincreasing；theaveragecurveradiuswaslessthanthededignvalue，thelinesmootherwaspoorandthelinecantwasover．Whatmore，thelinesegmentsystemandthefoundationstructureswereinvestigated，thewithintrackwearwasmoreser