Thermal differences between right and left portions of air-convection crushed-rock embankment in permafrost regions
Yanhu Mu, Wei Ma, Guoyu Li, Yongzhi Liu, Yuncheng Mao
In the proceedings of: GEO2010 Calgary: 63rd Canadian Geotechnical Conference & 6th Canadian Permafrost ConferenceSession: M1-D
ABSTRACT: ferencesbetweenrightandleftportionsofair-convectioncrushed-rockembankmentinpermafrostregionsYanhuMu,WeiMa,GuoyuLi&YongzhiLiuStateKeyLaboratoryofFrozenSoilsEngineering,ColdandAridRegionsEnvironmentalandEngineeringResearchInstitute,ChineseAcademyofSciences,Lanzhou,Gansu,ChinaYunchengMaoGansuProvincialCommunicationsResearchInstituteCo.,Ltd.ABSTRACTTherightandleftslopesofair-convectioncrushed-rockembankment(ACCE)commonlyexperienceconsiderablethermaldifferencesinpermafrostregions.ThosethermaldifferencescouldleadtoanasymmetricalthermalregimewithinandbeneaththeACCE,andthenresultindifferentdeformationsontheembankment.BasedoninsitugroundtemperaturealongtheQinghai-TibetRailway,thispaperchosethreemonitoringsitesofU-shapedair-convectioncrushed-rockembankmentwithdifferentorientationstoanalysisthethermaldifferencesbetweenrightandleftportionsoftheembankmentandunderlyingpermafrost.Theanalysisincludedcomparisonsoftemperatures,n-factors,freezingandthawingindicesofnear-surfacegroundsontheembankmentshouldersandthenaturalgrounds,andalsoincludestherelationshipsbetweenthethermaldifferencesandsolarradiationandwind-forcedconvectionoftheembankment.Finally,twodifferentconditionsofthethermalregimebeneaththeembankmentwerepresentedbygroundtemperatureprofilesoftheembankmentshouldersandthenaturalgrounds.Theresultsindicatedthatfortheembankmentwithorientationofnearnorthtosouth,thethermaldifferenceswassmallandthusthermalregimebeneaththeembankmentwasalmostsymmetrical;butforembankmentwithorientationofneareasttowest,inducedbysingleordoubleeffectsofthesolarradiationandthewind-forcedconvection,thethermaldifferencesweresignificantandconsequentlyledtoasevereasymmetricalthermalregimebeneaththeembankment.
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Cite this article:
Yanhu Mu; Wei Ma; Guoyu Li; Yongzhi Liu; Yuncheng Mao (2010) Thermal differences between right and left portions of air-convection crushed-rock embankment in permafrost regions in GEO2010. Ottawa, Ontario: Canadian Geotechnical Society.
@article{GEO2010_058,
author = Yanhu Mu; Wei Ma; Guoyu Li; Yongzhi Liu; Yuncheng Mao,
title = Thermal differences between right and left portions of air-convection crushed-rock embankment in permafrost regions ,
year = 2010
}
title = Thermal differences between right and left portions of air-convection crushed-rock embankment in permafrost regions ,
year = 2010
}