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《預(yù)壓作用下軟土固結(jié)蠕變及微觀結(jié)構(gòu)試驗(yàn)研究.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、第l0卷第3期地下空間與工程學(xué)報(bào)Vo1.102014年6月ChineseJournalofUndergroundSpaceandEngineeringJun.2014預(yù)壓作用下軟土固結(jié)蠕變及微觀結(jié)構(gòu)試驗(yàn)研究扈勝霞2,李平,吳小強(qiáng),郝艷娥(1.延安大學(xué)建筑工程學(xué)院,陜西延安716000;2.河海大學(xué)巖土力學(xué)與堤壩工程教育部重點(diǎn)實(shí)驗(yàn)室,南京210098;3.河海大學(xué)水資源利用與工程安全國家工程研究中心,南京210098)摘要:為了揭示預(yù)壓荷載作用下軟土路基工后沉降的機(jī)理,開展了室內(nèi)模擬真空、堆載以及真空一堆載聯(lián)合預(yù)壓加固軟土的固結(jié)蠕變?nèi)S試驗(yàn)及微觀結(jié)
2、構(gòu)試驗(yàn)。分析了在三種不同的預(yù)壓作用下土體固結(jié)蠕變性狀的不同和微觀結(jié)構(gòu)的變化機(jī)理。結(jié)果表明:在三種不同的預(yù)壓荷載作用下,固結(jié)過程中,是真空一堆載聯(lián)合預(yù)壓條件下土體的沉降量最大,其次是堆載預(yù)壓,最小的是真空預(yù)壓。蠕變過程的沉降量是堆載預(yù)壓的最大,其次是聯(lián)合預(yù)壓,最小的是真空預(yù)壓。預(yù)壓荷載作用下土體的固結(jié)和蠕變具有耦合效應(yīng);微觀結(jié)構(gòu)參數(shù)的變化受預(yù)壓加載方式的影響。微觀結(jié)構(gòu)參數(shù)的變化率與宏觀物性參數(shù)的變化率有相似的性質(zhì)。關(guān)鍵詞:預(yù)壓荷載;軟土;固結(jié)蠕變;微觀結(jié)構(gòu)中圖分類號(hào):TU447文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1673-0836(2014)03.0611.0
3、8TestStudyonConsolidation—CreepandMicrostructureCharacteristicsofSoftClayeySoilsbyPreloadingMethodHuShengxia,LiPing。WuXiaoqiang,HaoYan’e。,(1.CollegeofArchitectureEngineering,Yan’anUniversity,Yah’an,Shaanxi716000。Chinai2.KeyLaboratoryofMinistryofEducationforGeomechanicsandEmba
4、nkmentEngineering,HohaiUniversity,Nanfing210098,China;3.NationalEngineeringResearchCenterofWaterResourcesEfficientUtilizationandEngineeringSafety,HohaiUniversity,Nanjing210098,China)Abstract:Inordertoexplorethemechanismofthesettlementafterthecompletionofsoft~undationprojectim
5、—provedbypreloading,thetriaxialconsolidationandcreeptestshavebeencarriedoutwhichsimulatethesoftclayeysoilsunderconsolidationbyvacuum,surcharge。andcombinedvacuum—surchargepreloading.Themicrostructuretestsofsoftclayeysoilsbeforeandaftertriaxialtestshavebeencarriedouttoo.Thediff
6、erenceincharacteristicsofconsolidation-creepandmechanismofchangeofsoftsoilmicro--structureundertheloadingofthreedifferentpreload-ingmethodswereanalyzed.Theoutcomeasfollows:intheconsolidationprocess,themaximumsoilsettlementwasundertheconditionofvacuum—surchargepreloading,follo
7、wedbysurchargepreloading,thesmallestisvacuumpre-loading.Inthecreepprocess,soilsettlementwasmaximallyundertheconditionofsurchargepreloading-followedbyvacuum—surchargepreloading,thesmallestisvacuumpreloading.Thecourseofconsolidationandthecourseofcreepofsamplesunderthepreloading
8、methodshavecouplingeffect;Changesofmicrostructureparametersareundert