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1、第31卷第5期2014年5月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentV01_31No.5May2014doi:10.3969/j.issn.1002—0268.2014.05.001循環(huán)荷載作用下軟土動力特性試驗(yàn)研究張向東1,劉家順1,張虎偉2(1.遼寧工程技術(shù)大學(xué)土木與交通學(xué)院,遼寧阜新123000;2.遼寧建筑職業(yè)學(xué)院建筑經(jīng)濟(jì)系,遼寧遼陽111000)摘要:為研究循環(huán)荷載作用引起的軟土動力特性變化及由此導(dǎo)致的地基承載力不足等問題,以營口軟土為研究對象,通過動三軸試驗(yàn)
2、,研究了動應(yīng)力幅值、固結(jié)圍壓、固結(jié)比、振動頻率和振動次數(shù)對軟土動力特性的影響。試驗(yàn)結(jié)果表明:營口軟土具有明顯的結(jié)構(gòu)性,其動應(yīng)變一振動次數(shù)(占。一lgN)曲線和動骨干曲線存在明顯的應(yīng)變轉(zhuǎn)折點(diǎn),超過此應(yīng)變轉(zhuǎn)折點(diǎn)后,土體變形迅速增加;動強(qiáng)度隨固結(jié)圍壓的增加而增大,固結(jié)比和振動頻率對軟土動強(qiáng)度的影響卻并非簡單的一致增大或減??;動彈性模量隨固結(jié)圍壓、固結(jié)比和振動頻率的增加而增大,而動阻尼比則隨著固結(jié)圍壓和固結(jié)比的增加而減小,隨振動頻率的增加而增大。關(guān)鍵詞:道路工程;軟土;試驗(yàn)研究;循環(huán)荷載;動強(qiáng)度;動骨干曲線;動模量中圖分類號:TU435文獻(xiàn)標(biāo)識碼:A文章編號
3、:1002—0268(2014)05—0001—07ExperimentalStudyonDynamicCharacteristicofSoftSoilunderCyclicLoadingZHANGXiang—don91,LIUJia—shun1,ZHANGHu—wei2(1.SchoolofCivilEngineeringandTransportation,LiaoningTechnicalUniversity,F(xiàn)uxinLiaoning123000,China;2.DepartmentofArchitecturalconomics,Liaonin
4、gJianzhuArchitectureVocationalUniversity,LiaoyangLiaoning111000,China)Abstract:Inordertoresearchthedynamiccharacteristicschangeofsoftsoilduetocyclicloadingandtheinducedparticularinadequatebearingcapacityofroadbed,takingthesoftsoilinYingkOUareaastheresearchobject,aseriesofdynami
5、ctriaxialtestareperformedtoresearchtheinfluenceofdynamicstressamplitude,consolidationconfiningpressure,consolidationratio,vibrationfrequencyandvibrationtimesondynamiccharacteristicsofsoftsoilareresearched.Thetestresultsshowthat(1)Yingkousoftsoilhasasignificantstructuralproperty
6、,thereisastrainturningpointinthe占d—Ncurvesandthedynamicbackbonecurves,thedeformationofsoilincreasesrapidlywhenthestrainislargerthanthisturningpointstrain;(2)thedynamicstrengthincreasesasconsolidationconfiningpressureincreasing,buttheinfluencesofconsolidationratioandvibrationfre
7、quencyonsoftsoildynamicstrengtharenotalwaysincreasingordecreasing;(3)thedynamicmodulusincreasesasconsolidationconfiningpressure,consolidationratioandvibrationfrequencyincreasing,whilethedynamicdampingratiodecreasesasconsolidationconfiningpressureandconsolidationratioincreasingb
8、utincreasesasvibrationalfrequencyincreasing.Keywords:r