厚层水泥稳定碎石基层病害机理分析及处置对策研究

《厚层水泥稳定碎石基层病害机理分析及处置对策研究》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、摘要整体大厚度水泥稳定碎石基层是我国高速公路基层主要结构形式之一，本文在现有研究基础上，对其破坏特点及破坏机理进行了研究。结果表明，基层层间的非连续性会显著降低路面结构使用质量及使用寿命，实际应用中因分层施工产生的层间薄弱面是造成此类结构整体性能较差的主要原因，薄弱夹层的出现使在设计时假设的基层整体厚板受力变为多薄板受力，结构计算表明，增加基层厚度或加大基层上部厚度能够降低薄弱层对结构造成的不利影响。此外，考虑到在现有压实条件下，铺筑厚度的增加会降低结构层整体性能，因此，减少因加大铺筑厚度而造成的整体性能降低，

2、是提高单层铺筑厚度的前提保证，据此对上下压实效果不同变异条件下水泥稳定碎石路用性能进行了研究。研究结果表明，上下压实差异的存在会降低路用性能，但是，可以通过提高基层上部压实标准的措施来减少上下性能差异，确保下部结构使用质量，进而提高基层路用性能。最终，在室内研究的基础上，结合浙江省两龙高速厚层水泥稳定碎石基层试验路进行验证。研究成果对推广整体大厚度水泥稳定碎石基层结构形式具有一定的指导意义。关键词：厚层水泥稳定碎石、层间状态、病害机理、性能测试、BISAR模拟计算AbstractLargethicknessof

3、overallcementstabilizedaggregatebaseisoneofthemainbasestructurehighwaysinourcourt时．Atthebestofthefieldtestandanalysisinhighwaymajorrepairworks，thencombmetheexistingresearchresults．Westudiedthefeaturesofsuchbasestructuredamageanditsmechanism．Theresultsshowtha

4、tnoll·continuitybetweenbaselayersreducesusequalityandlifetime．Stratifiedlayersconstructionwillcausetheweaksideinpracticalapplication；itisthemainreasonofpoorentirelyquality．Theeme唱enceofweaklayerchangethestressinbasechangedfromdesigningoveralllayertoanumberof

5、thin-layers．ThestructuralcalculationsshowthatincreasethethicknessoraddtheupperbasethicknessCanreduceadverseeffectscausedbyweaklayerinstructure．Inaddition，intheexistingcompactioncondition，increasingthethicknessofthelayerwillreducetheoverallperformanceofthestr

6、ucture．Itisapromisethateducingtheeffectcanimprovethesin#e-layerthickness．Therefore，thestudyofdifferenteffectsonthewholevariationofcompactionundertheconditionsofperformanceofcementstabilizedaggregate．Theresultsshowthattheexistenceofdifferencescompactionbetwee

7、nupperandlowerwillreducepavementperformance．However，weCallreducethedifferencebetweenupperandlowerbyimprovingtheuppercompaction．Inthisway，weensuretheperformanceoflowerstructureandimprovethepavementperformanceinbase．Finally,atthebaseofstudy,weverifytheresultsb

8、ycombiningthetestroadoflargethicknessofcementstabilizedaggregatebaseinLiang—LongExpresswayinZhejiangProvince．Theresearchresultshaveacertainsignificancetoimprovethelargethicknessof(overallcements