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时间:2019-02-05
《对贵州地区石灰改良膨胀土无侧限抗压强度的试验研究①》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第11卷第6期铁道科学与工程学报Volume11Number62014年12月JournalofRailwayScienceandEngineeringDecember2014贵州地区石灰改良膨胀土无侧限抗压强度的试验研究①122222高晓波,阮波,田晓涛,吕有缘,李思嘉,汤彬彬(1.长沙中大建设监理有限公司,湖南长沙410075;2.中南大学土木工程学院,湖南长沙410075)摘要:以贵州地区某工程的膨胀土为研究对象,通过室内试验,研究石灰掺入率、压实系数及养护龄期对改良土无侧限抗压强度的影响。试验结果表明:改良土无侧限抗压强度随着压实系数的增大而增大,随着
2、龄期的增长而增大,随着石灰掺入率的增加先增大后减小,最佳掺灰率为9%。无侧限抗压强度影响因素的灰色关联度分析结果表明,压实系数对改良土无侧限抗压强度的影响最大,其次是养护龄期,而掺灰率的影响最小。改良土的应力应变关系曲线呈应变软化模型,试样的破坏模式为脆性破坏。本文的研究结果可为类似工程提供借鉴。关键词:膨胀土;石灰改良土;无侧限抗压强度;灰色关联度分析;脆性破坏中图分类号:TU411.6文献标志码:A文章编号:1672-7029(2014)06-0068-04Experimentstudyonunconfinedcompressivestrengthofli
3、mestabilizedexpansivesoilinGuizhouprovince122222GAOXiaobo,RUANBo,TIANXiaotao,LYouyuan,LISijia,TANGBinbin(1.ChangshaCentralSouthUniversitySupervisionCo.Ltd,Changsha410075,China;2.SchoolofCivilEngineering,CentralSouthUniversity,Changsha410075,China)Abstract:Anexperimentalinvestigatio
4、nwasundertakentostudytheeffectsoflimestabilizedsoilonthestrengthbehaviorofexpansivesoil.Inthepresentinvestigation,aseriesoflaboratorytests(unconfinedcompressiontests)wereconductedonlimestabilizedexpansivesoilwhichwasfromGuizhouprovince.Limecontents,rangingfrom3%,5%,7%,9%,to11%ofdry
5、weightofexpansivesoilwereusedinthestabilizedsoil.Inaddition,thestabilizedsoilwascompressedatcompactingfactorof0.90,0.92,and0.95.Testsonexpansivesoilswereconductedatdifferentcuringperiodsi.e.,7,14,and28days.Thetestresultsrevealthatunconfinedcompressivestrength(USC)increasessignifica
6、ntlywiththeincreaseofthecompactingfactorandthecuringperiod.Also,theresultsshowthatUSCofthetreatedexpansivesoiltendtoincreasewithincreasinglimecontentupto9%,beyondwhichitslightlydecreases.GreycorrelationanalysiswhichwasaboutthefactorsofUSCindicatesthatcompactingfactoristhemostimpor
7、tantfactoraffectingUSCofthesample,followedbythecuringperiod,andlimecontentenhancedUSCtheleast.Thebrittlefailureoccursforallthesamplesofthelimetreatedexpansivesoil,whenthestress-strainrelationshippresentsstrainsofteningcharacteristics.Theresearchresultsareofreferencevaluetodesignan
8、dconstructionforoth
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