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时间:2020-04-24
《固化淤泥长期强度和变形特性试验研究-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第44卷第1期中南大学学报(自然科学版)Vb1.44N0.12013年1月JournalofCentralSouthUniversity(ScienceandTechnology)Jan2O13固化淤泥长期强度和变形特性试验研究王东星,一,徐卫亚,r1.河海大学岩土工程研究所,江苏南京,210098;2.河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京,210098;3.D6partementG6nieCiviletEnvirom~emental,EcoledesMinesdeDouai,Douai59500,France)摘要:采用INSTRO
2、N5500R4206—006型微机控制电子万能试验机,对基于水泥、石灰和低钙粉煤灰的固化淤泥进行无侧限抗压强度试验和间接抗拉强度试验,得到标准养护360d淤泥固化土的应力一应变关系、破坏强度和破坏应变。研究结果表明:固化剂掺入导致固化土破坏应变明显减小,无侧限抗压强度和抗拉强度明显增大,且破坏模式由塑性破坏逐渐向脆性破坏方向发展;从长期强度和经济成本角度,石灰一低钙粉煤灰匮I化剂完全可取代同配比水泥一低钙粉煤灰固化剂;淤泥固化土的无侧限抗压强度与抗拉强度之比为10左右;掺加适当配比粉煤灰的设计固化材料可考虑用作低强度交通负载公路路基材料。关键词:海相
3、淤泥;粉煤扶;固化;长期强度;变形中图分类号:TU43文献标志码:A文章编号:1672—7207(2013)01—0332—08Experimentalstudyonlong—termstrengthanddeformationpropertiesofsolidifiedsedimentsWANGDongxing,一.XUWeiya’(1.GeotechnicalResearchInstitute,HohaiUniversity,Nanjing210098,China;2.KeyLaboratoryofMinistryofEducationforGe
4、omechanicsandEmbankmentEngineering,HohaiUniversity,Nanjing210098,China;3.CivilandEnvironmentalEngineeringDepartment,EcoledesMinesdeDouai,Douai59500,France)Abstract:Formarinesedimentssolidifiedwithcement,limeandlow—calciumflyash,theunconfinedcompressivestrengthtestsandindirectte
5、nsilestrengthtestswereperformedbyusingamicrocomputer-controlledelectronicuniversaltestingmachinenamed1NSTRON5500R4206—006,thestress—straincurve,failurestrengthandfailurestrainofsamplesatcuringtimeof360dweredetermined.Theresultsshowthattheincorporationofstabilizerscausesthefailu
6、restraintodecrease,thecompressivestrengthandtensilestrengthofsolidifiedsedimentstoincrease,whilethefailuremodeofsolidifiedsedimentsdevelopsgraduallyfromplasticfailuretobrittlefailure.Thedesignedlime—lowcalciumflyashstabilizercancompletelyreplacecement—lowcalciumflyashstabilizer
7、fromthepointofviewofeconomicalcostandlong—termstrength.Forsolidifiedsediments,theratioofunconfinedcompressivestrengthtotensilestrengthisabout10.Finally,thedesignedstabilizerswithappropriateratioofflyashcanbeconsideredasroadbedmaterialsforlow—intensitytraficpavement.Keywords:mar
8、inesediment;flyash;solidification;long—termstrength;de
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