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《干旱區(qū)土遺址鹽漬帶風(fēng)蝕損耗效應(yīng)微觀機(jī)制研究.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫(kù)。
1、第33卷第4期巖土力學(xué)、,0I-33NO.42012年4月RockandSoilMechanicsApr.2012文章編號(hào)l1000-7598(2012)O4—1167—06干旱區(qū)土遺址鹽漬帶風(fēng)蝕損耗效應(yīng)微觀機(jī)制研究崔凱,2,。,諶文武2,4,王旭東2,47韓文峰2一,朱彥鵬,(1.蘭州理工大學(xué)甘肅省土木工程防災(zāi)減災(zāi)重點(diǎn)實(shí)驗(yàn)室,蘭州730050;2.蘭州大學(xué)西部災(zāi)害與環(huán)境力學(xué)教育部重點(diǎn)實(shí)驗(yàn)室,蘭州7300003.西部土木工程防災(zāi)減災(zāi)教育部工程研究中心,蘭州730050;4.國(guó)家古代壁畫(huà)保護(hù)工程技術(shù)研究中心,甘肅敦煌736200)摘要:基于西北干旱地區(qū)
2、典型土遺址鹽漬帶鹽分野外觀測(cè)和定性分析結(jié)果,初步總結(jié)了土遺址鹽漬土帶特征并闡釋了風(fēng)蝕損耗效應(yīng)的概念;通過(guò)對(duì)摻入不同含量2種鹽漬帶常見(jiàn)鹽分Na2SO4和NaCI,并經(jīng)歷干濕循環(huán)的遺址土重塑樣的風(fēng)洞模擬試驗(yàn)和微結(jié)構(gòu)分析試驗(yàn),揭示了鹽漬帶中常見(jiàn)鹽分發(fā)生的鹽漬過(guò)程會(huì)對(duì)遺址土抗風(fēng)蝕能力產(chǎn)生顯著的影響;并通過(guò)統(tǒng)計(jì)學(xué)分析方法證實(shí)了試樣的風(fēng)蝕速率與有關(guān)孔隙的部分微結(jié)構(gòu)特征參數(shù)之間存在著良好的對(duì)應(yīng)關(guān)系;最后結(jié)合定性分析和試驗(yàn)研究結(jié)果從微觀角度對(duì)土遺址鹽漬帶土的風(fēng)蝕損耗機(jī)制進(jìn)行了初步的討論。關(guān)鍵詞:干旱區(qū);土遺址;鹽漬帶;風(fēng)蝕損耗效應(yīng);微觀機(jī)制中圖分類號(hào)lTu42文獻(xiàn)標(biāo)
3、識(shí)碼:AStudyofmicroscopicmechanismofeffectofaeolianerosionullageatsalinizationbeltonearthenruinsinaridregionCUIKail,2,3,4,CHENWen—WU2,4WANGXu—dong,,HANWen.feng2,4ZHUYan—peng,3,,(1.KeyLaboratoryofDisasterPreventionandMitigationinCivilEngineeringofGansuProvince,LanzhouUniversityofTe
4、chnology,Lanzhou730050,China;2.KeyLaboratoryofMechanicsonDisasterandEnvironmentinWesternChinaofMinistryofEducation,LanzhouUniversity,Lanzhou730000,China;3.WesternCenterforDisasterMitigationinCivilEngineeringofMinistryofEducation,Lanzhou730050,China;4.NationalEngineeringResearch
5、CenterforConservationofAncientWallPainting,Dunhuang,Gansu736200,China)Abstract:Basedonsalinityfieldobservationsandqualitativeanalysisresultsatsalinizationbeltofthetypicalearthenruinsintheresearcharea,thepapersummarizesthecharacteristicsofearthenruinswithsalinesoilandgeneratesab
6、riefconceptofaeolianerosionullageefect.Andthen,onthebasisofwindtunnelsimulationexperimentandmicrostructureanalysisresultsofreconstitutedsamplesgoingthroughdry—wetcirculationafterbeingmixedwithdiferentcontentofcommonsaltsNa2SO4andNaC1,itrevealsthatthesalineprocessofthosesaltshav
7、esignificantimpa~onanti-erosionabilityofthesite,andagoodcorrelationexistingbetweenmicrostructurecharacteristicsparametersofporeandwinderosionrateofthesamplesundersalineprocessisalsoprovedbystatisticalanalysismethod.Finally,withacombinationofthequalitativeanalysisandtheexperimen
8、talresults,depletionmechanismoftheefectofaeolianerosio