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时间:2019-05-13
《基于FWD路表动态弯沉盆参数的路基模量评价研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第36卷,第2期公路工程Vo1.36,No.22011年4月HighwayEngineeringApt.,2011基于FWD路表动态弯沉盆参数的路基模量评价研究罗启添。,邱欣,杨青(1.珠海市规划设计研究院,广东珠海519000;2.浙江师范大学工学院,浙江金华321004)[摘要】为客观地反映既有路基的承载能力状况,基于结构动力学基本理论,建立了沥青路面结构的动力有限元数值分析模型,分析了路基模量参数与路表动态弯沉盆参数指标的相关关系,据此构建了路基模量参数的预测分析模型,并探讨了层间非连续接触、路面横向开裂及刚性层深度等因素条件对路基模量预测结果的影响。结
2、果表明:路表动态弯沉盆参数指标与路基模量之间具有良好的相关性,路基模量可由直接弯沉参数指标、形状参数指标以及结构层厚度联合确定;路面开裂及层间非连续接触行为对路基模量参数的预测结果没有影响;当路基内刚性层深度小于6m时,路基模量预测分析结果明显偏大。研究结果为进一步推广FWD测试设备在路基结构性能评定中的广泛应用提供了技术保障。[关键词]路基;落锤式弯沉仪;模量预测;影响分析;数值计算[中图分类号】TU113;U416.03[文献标识码]A[文章编号]1674—0610(2011)02—0004—05EvaluationStudyonSubgradeModul
3、usBasedonFWDDynamicDeflectionBasinParametersLUOQitian,QIUXin,YANGQing(1.InstituteofUrbanPlanning&Design,Zhuhai,Guangdong519000,China;2.CollegeofEngineer-ing,ZhejiangNormalUniversity,Jinhua,Zhejiang321004,China)[Abstract]Toreflectthebearingabilityconditionoftheexistedsubgrade,determi
4、ningitsmodulusisacrucialtaskforhighwayengineers.Theobjectiveofthisstudywastoestablishamethodtopredictsubgrademodulusofasphaltpavementsandanalyzeitsapplicability.Firstly,Basedonthebasictheoryofstructuredynamics,thefiniteelementmodeloftheintactasphaltpavementwasestablishedtogenerateas
5、yntheticdatabaseofsurfacedynamicdeflectionbasinparameter(DBP)indicators.Secondly,therela—tionshipbetweenDBPindicatorsandsubgrademoduluswasdiscussedbytherelatedcoefficient,thentheregressionfunctionforpredictingsubgrademoduluswasestablished.Finally,theinfluenceofthefactorsincludingtra
6、nsversecracking,interfacecontaetconditionandrigidlayerdepthonthepredictedresultsofsubgrademoduluswasperformed.Theanalysisresultsdemonstratethatthesubgrademoduluscanbepre-dietedbythedirectdeflectionindicatord9,shapeindicatorF8andstructurelayerthicknessandthepre-dietedprecisionissatis
7、fied.Thetransversecrackingandlayerinterfaceconditionofpavementstructurehasfeweffectonthepredictedresultsofsubgrademodulus.Nevertheless,therigidlayerdepththatislessthan6mwillhavethemajorimpactonthepredictedresultsofsubgrademodulus.Theresearchre—suhsprovideatechnologysupportstopopular
8、izeFWDtestingtechno
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