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1、第29卷第4期公路交通科技V0l_29No.42012年4月JournalofHighwayandTransportationResearchandDevelopmentApr.2012doi:10.3969/j.issn.1002—0268.2012.04.002沖壓荷載下舊水泥混凝土路面的變形及應(yīng)力楊娥,劉劍(1.廣州航海高等??茖W(xué)校航務(wù)工程學(xué)院,廣東廣州510700;2.華南理工大學(xué)土木與交通學(xué)院,廣東廣州510640)摘要:為準(zhǔn)確分析沖壓荷載作用下舊水泥混凝土路面的變形和應(yīng)力分布狀況,通過建立合適的有限元模型來對其分析計
2、算,并以第一強度理論來判斷舊路面板的破裂情況,總結(jié)了路面板在沖擊壓實情況下的破壞機理。通過該模型得出舊水泥路面板豎直方向和水平方向的變形和受力特點,即:路面板在沖壓荷栽作用下發(fā)生縱、橫雙向彎曲變形,并以全斷面的縱向彎曲變形為主,最大變形值位于路面板的兩沖壓輪之間的位置,路面板斷面上豎向各點的沉降變形有微小變化,變形性態(tài)說明路面板將以彎曲形式發(fā)生破壞;路面板在輪壓荷栽作用下,上面層受壓應(yīng)力,下面層受拉應(yīng)力,拉壓應(yīng)力的分界點在路面板中心偏下的位置,上面層絕大部分區(qū)域3個方向均處于受壓狀態(tài),縱向壓應(yīng)力幾乎為橫向壓應(yīng)力的2倍。關(guān)鍵詞:道
3、路工程;舊水泥混凝土路面;有限元;變形;沖壓荷載;應(yīng)力分析中圖分類號:U416.216文獻(xiàn)標(biāo)識碼:A文章編號:1002—0268(2012)04—0007—07DeformationandStressofOldCementConcretePavementunderStampingLoadYANGE,LIUJian(1.SchoolofNavigationalEngineering,GuangzhouMaritimeCollege,GuangzhouGuangdong510700,China;2.SchoolofCivilEngi
4、neering&Transportation,SouthChinaUniversityofTechnology,GuangzhouGuangdong510640,China)Abstract:Foraccuratelyanalysingthedeformationandstressdistributionofoldcementconcretepavementunderstampingload,theappropriatefiniteelementmodelwasestablishedforanalysisandcalculati
5、on,thefirststrengththeorywasusedtodeterminetheruptureoftheoldpavementslab,andthefailuremechanismofpavementslabunderimpactcompactionwassummedup.Theresultindicatesthatthemodelcanbeusedtoobtainthedeformationandthemechanicalcharacteristicsoftheoldconcreteroadpanelsinvert
6、icalandhorizontaldirections,i.e.,longitudinalandhorizontalbendingoccurredinroadpanelunderstampingload,mainlythelongitudinalbendingdeformationofthewholesection,themaximumdeformationoccuredatthepositionofthepavementslabbetweentwostampingwheels,thesettlementdeformations
7、ubtlechangedintheverticaldirectionofcross-sectionofpavementslab,andthedeformationbehaviorindicatedthatthepavementslabwillbebendingdestructed.Underthewheelpressureloads,theupperlayerborecompressivestressandthelowerlayerboretensilestress,thecut-ofpointoftensionandcompr
8、essionstresseswasatthelowerpositioninthepavementslab,mostpartoftheupperlayerwasincompressionstateinthreedirections,andlongitudinalc