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1、第3O卷第3期公路交通科技V01.30No.32013年3月JournalofHighwayandTransportationResearchandDevelopmentMar.2013doi:10.3969/j.issn.1002—0268.2013.03.007降雨入滲因素對(duì)炭質(zhì)泥巖路堤邊坡穩(wěn)定性的影響曾鈴,付宏淵,賀煒,何忠明,周功科(1.道路結(jié)構(gòu)與材料交通行業(yè)重點(diǎn)實(shí)驗(yàn)室(長沙理工大學(xué)),湖南長沙410004;2.長沙理工大學(xué)土木與建筑學(xué)院,湖南長沙410004;3.長沙理工大學(xué)交通運(yùn)輸工程學(xué)院,湖南長沙410004)摘要:為了探討降雨入滲因素對(duì)炭質(zhì)泥巖路堤邊坡穩(wěn)定性的
2、影響,結(jié)合室內(nèi)試驗(yàn)數(shù)據(jù)及降雨統(tǒng)計(jì)資料,通過擬定不同的分析方案,采用飽和一非飽和滲流與非飽和抗剪強(qiáng)度理論對(duì)某炭質(zhì)泥巖路堤邊坡在降雨強(qiáng)度、飽和滲透系數(shù)、路堤邊坡坡度3種降雨入滲因素變化下的穩(wěn)定性進(jìn)行數(shù)值模擬,進(jìn)而深入探討上述3種入滲因素對(duì)炭質(zhì)泥巖路堤邊坡穩(wěn)定性的影響。研究表明:(1)隨著降雨持續(xù)時(shí)間的增加,降雨強(qiáng)度越大,路堤邊坡安全系數(shù)下降越明顯;(2)滲透系數(shù)的大小決定了降雨入滲量及滲透速率;(3)不同坡度路堤邊坡受降雨的影響,其安全系數(shù)變化規(guī)律一致;(4)路堤內(nèi)負(fù)孔隙水壓力的喪失與體積含水率的增大是引起邊坡失穩(wěn)的最主要因素。關(guān)鍵詞:道路工程;炭質(zhì)泥巖路堤;飽和一非飽和滲流;邊
3、坡穩(wěn)定性;降雨中圖分類號(hào):U416.12;U416.16文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1002—0268(2013)03—0039—06EfectsofRainfalllnfiltrationFactorsonStabilityofCarbonaceousMudstoneEmbankmentSlopeZENGLing,F(xiàn)UHongyuan,HEWei,HEZhongming,ZHOUGongke(1.KeyLaboratoryofRoadStructureandMaterialofMinistryofTransport,ChangshaUniversityofScience&Tec
4、hnology,ChangshaHunan410004,China;2.SchoolofCivilEngineeringandArchitecture,ChangshaUniversityofScience&Technology,ChangshaHunan410004,China;3.SchoolofTraffic&TransportationEngineering,ChangshaUniversityofScience&Technology,ChangshaHunan410004,China)Abstract:Inordertoexploretheeffectofrainf
5、allinfiltrationfactorsonstabilityofcarbonaceousmudstoneembankmentslope,combiningwiththeindoorexperimentaldataandrainfallstatistics,byplanningdifferentanalysisschemes,thestabilityofcarbonaceousmudstoneembankmentslopewiththechangeofrainfallinfiltrationfactors,includingrainfallintensity,satura
6、tedpermeabilitycoefficientandslopegradeissimulatedbyusingsaturated—unsaturatedseepagetheoryandunsaturatedshearstrengththeory.Then,theeffectsoftheserainfallinfiltrationfactorsonstabilityofcarbonaceousmudstoneembankmentslopearediscussedin—depth.Theresuhsshowthat(1)withtheincreaseofrainfalldur
7、ation,thebiggertherainfallintensity,theremarkabletheslopesafetycoefficientdeclines;(2)thevaluesofpermeabilitycoefficientdecidestherainfallinfiltrationamountandinfiltrationrate;(3)Whiletheslopeswithdifferentgradesunderrainfallinfluence,thechangeregulariti