地震荷载作用下大坝系统的非线性动力损伤分析
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摘要
本文在连续损伤力学理论基础上,把非线性动力损伤的概念引入岩石类介质的本构模型,分别提出岩石类材料的脆性动力损伤和粘弹塑性动力损伤破坏模型。同时,将损伤、渗流及孔隙率演化等相互耦合的有效应力概念引入Mohr Coulomb破坏准则,用于分析在渗流压力、损伤发展、孔隙率演化和动应力共同作用下堤坝及岩基系统的非线性地震动力损伤,建立了相应的二维有限元动力损伤数值分析模型,并应用于地震荷载作用下的龙滩混凝土重力坝及其岩基的破坏过程分析,分析结果可作为大坝的安全性评估的依据。
Based on the theory of continuous damage mechanics the concept of nonlinear dynamic damage is introduced into the constitutive model for rocky material.The model for brittle material and the model for visco|plastic material are established consequently.Furthermore,the effective stress formed by the combination of damage,seepage pore pressure and porosity evolution in cracked mass are introduced into the Mohr|Couloum failure model to develop the failure criterion for dynamically damaged rock structure.The corresponding 2|D models of FEM for numerical calculation of damage are established.The proposed models are applied to analyze the failure process of the gravity dam and its rocky foundation in the Longtan Project under the action of earthquake.
Based on the theory of continuous damage mechanics the concept of nonlinear dynamic damage is introduced into the constitutive model for rocky material.The model for brittle material and the model for visco|plastic material are established consequently.Furthermore,the effective stress formed by the combination of damage,seepage pore pressure and porosity evolution in cracked mass are introduced into the Mohr|Couloum failure model to develop the failure criterion for dynamically damaged rock structure.The corresponding 2|D models of FEM for numerical calculation of damage are established.The proposed models are applied to analyze the failure process of the gravity dam and its rocky foundation in the Longtan Project under the action of earthquake.
引文
[1] 张楚汉,王光纶.水利、水电工程科学前沿[M].北京:清华大学出版社,2002.357-397.
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[13] SDJ10 78.水工建筑物抗震设计规范[S].
[2] 何蕴龙,陆述远,段亚辉.重力坝地震动力响应分析[J].世界地震工程,1998,14(3):32-36.
[3] 陈健云,林皋,李静.高拱坝的非线性开裂静动力响应分析[J].世界地震工程,2001,17(3):85-90.
[4] 林皋,陈健云.混凝土大坝的抗震安全评价[J].水利学报,2001,(2):8-15.
[5] 张我华.煤 瓦斯突出过程中煤介质局部化破坏的损伤机理[J].岩土工程学报,1999,21(6):731-736.
[6] 张我华,金荑,陈云敏.损伤材料的动力响应特性[J].振动工程学报,2000,13(2):211-224.
[7] FrantziskonisG,DesaiCS.Constitutivemodelwithstrainsoftening[J].InternationalJournalofSolidsStructures,1987,23(6):733-750.
[8] RichardeG.Introductiontorockmechanics[M].儒林图书有限公司发行,台北重庆南部111号,1980.
[9] 张我华,金荑.各向异性损伤力学中的弹塑性分析[J].固体力学学报,2000,21(1):89-94.
[10] ValliappanS,ZhangWH.Roleofgasenergyduringcoaloutbursts[J\〗.InternationalJournalNumericalMethodinEngineering,1999,44:875-895.
[11] ZhangWH,ValliappanS.Continuumdamagemechanicstheoryandapplication,PartI theory,PartⅡ applications[J].InternationalJournalDamageMechanics,1998,(7):250-297.
[12] ZhangWH.NumericalAnalysisofContinuumDamageMechanics[D].Australia:UniversityofNewSouthWales,1992.
[13] SDJ10 78.水工建筑物抗震设计规范[S].
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