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1、第36卷第7期巖土力學(xué)Vol.36No.72015年7月RockandSoilMechanicsJul.2015DOI：10.16285/j.rsm.2015.07.013堆石料的剪脹特性與廣義塑性本構(gòu)模型1,222王占軍，陳生水，傅中志（1.長江勘測規(guī)劃設(shè)計(jì)研究院，湖北武漢430010；2.南京水利科學(xué)研究院水利部土石壩破壞機(jī)理與防控技術(shù)重點(diǎn)實(shí)驗(yàn)室，江蘇南京210029）摘要：以三軸試驗(yàn)成果為基礎(chǔ)，考慮顆粒破碎引起堆石料剪脹比與應(yīng)力比之間的非線性關(guān)系，提出了能夠反映堆石料低圍壓剪脹、高圍壓剪縮特性的剪脹方程。在廣義塑性理論框架內(nèi)構(gòu)造堆石料的塑性流動(dòng)
2、方向向量和加載方向向量，引入依賴于密實(shí)度與平均應(yīng)力的壓縮參數(shù)，構(gòu)造隨平均應(yīng)力、剪應(yīng)力比和密實(shí)度變化的塑性模量，建立了一個(gè)考慮顆粒破碎的堆石料彈塑性本構(gòu)模型。闡述了該模型10個(gè)參數(shù)的確定方法，并通過模擬不同圍壓和不同應(yīng)力路徑下堆石料的三軸壓縮試驗(yàn)資料驗(yàn)證了模型與參數(shù)的合理性。關(guān)鍵詞：堆石料；顆粒破碎；剪脹性；廣義塑性理論；彈塑性本構(gòu)模型中圖分類號(hào)：TU411文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1000－7598(2015)07－1931－08Dilatancybehaviorsandgeneralizedplasticityconstitutivemodelofr
3、ockfillmaterials1,222WANGZhan-jun，CHENSheng-shui，F(xiàn)UZhong-zhi（1.ChangjiangInstituteofSurvey,Planning,DesignandResearch,Wuhan,Hubei430010,China;2.KeyLaboratoryofEarth-RockDamFailureMechanismandSafetyControlTechniquesofMinistryofWaterResources,NanjingHydraulicResearchInstitute,Nan
4、jing,Jiangsu210029,China）Abstract:Basedontheresultsoftriaxialexperimentsonrockfillmaterials,adilatancyequationisderivedbyconsideringthenonlineardependenceofthedilatancystressratioonthestressratio(i.e.theratioofthedeviatoricstresstothemeanstress).Thisequationrevealsthedeformatio
5、ncharacteristicsofrockfillmaterialsinducedbydilatancyappearingatlowconfiningpressureandbyshearshrinkageappearingathighconfiningpressure.Withintheframeworkofthegeneralizedplasticitytheory,theplasticflowdirectionvectorandtheloadingdirectionvectorarededuced.Acompressionindexisdete
6、rminedintermsofcompactness-dependentandmeanstress-dependenteffects.Thentheplasticmodulusisformulatedasafunctionofthemeanstress,theshearstressratioandthecompactness.Onthebasisofabovestudies,anewelastoplasticconstitutivemodelisderivedbyconsideringtheparticlebreakageofrockfillmate
7、rials.Themethodsareaddressedtodeterminetenmaterialparametersofthismodel.Finally,theproposedmodelisusedtosimulatethetriaxialtestsonrockfillmaterialsunderdifferentconfiningpressuresandstress-paths,andthesimulationresultsaregoodagreementwiththeexperimentaldata.Keywords:rockfillmat
8、erials;particlebreakage;dilatancy;generalizedplasticit
