强震作用下高拱坝损伤开裂研究
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摘要
本文基于混凝土的力学特性,建立能够反映混凝土动态情况的多轴损伤开裂模型。以等效三维一致粘弹性边界反映远域地基辐射阻尼效应,采用Mohr-Coulomb材料模型模拟坝基裂隙岩体在地震作用下的力学行为,运用非线性地震波动分析方法研究国内某拱坝在强震作用下的损伤开裂过程。通过对大坝的损伤程度以及坝体上、下游面的最大拉应力进行分析,给出大坝的抗震薄弱部位,并对其抗震安全性进行了评价。研究揭示拱坝动力损伤灾变机理,为高拱坝抗震安全评价提供一种分析途径。
A multi-axial damage and cracking model is developed to model the dynamic properties of concrete materials.In this model,Mohr-Coulomb model is used to simulate the dynamic behaviors of dam foundation rock mass under earthquake,with the effect of far-domain radiation damping modeled by a 3D consistent equivalent viscous-spring boundary.This model is applied to an arch dam subjected to strong earthquake,and its damage and cracking process are studied with a method of nonlinear seismic wave motion analysis.Through an analysis on damage extent and maximum tensile stress on its upstream and downstream surfaces,aseismic safety of the dam is evaluated,and the weak parts of the dam in terms of aseismic behaviors are determined.This study reveals a mechanism of dynamic damage and catastrophe,and would provide an analytical approach to aseismic safety analysis of high arch dam.
A multi-axial damage and cracking model is developed to model the dynamic properties of concrete materials.In this model,Mohr-Coulomb model is used to simulate the dynamic behaviors of dam foundation rock mass under earthquake,with the effect of far-domain radiation damping modeled by a 3D consistent equivalent viscous-spring boundary.This model is applied to an arch dam subjected to strong earthquake,and its damage and cracking process are studied with a method of nonlinear seismic wave motion analysis.Through an analysis on damage extent and maximum tensile stress on its upstream and downstream surfaces,aseismic safety of the dam is evaluated,and the weak parts of the dam in terms of aseismic behaviors are determined.This study reveals a mechanism of dynamic damage and catastrophe,and would provide an analytical approach to aseismic safety analysis of high arch dam.
引文
[1]陈厚群.混凝土高坝强震震例分析和启迪[J].水利学报,2009,40(1):10～18.Chen Houqun.Analysis on damages of high concrete dams subjected to strong earthquake and lessons for learning[J].Journal ofHydraulic Engineering,2009,40(1):10～18.(in Chinese)
[2]Faria R,Oliver J,Cervera M.A strain-based plastic viscous-damage model for massive concrete structures[J].InternationalJournal of Solids Structures,1998,35(14):1533～1558.
[3]Valliappan S,Yazdchi M,Khalili N.Seismic analysis of arch dams—a continuum damage mechanics approach[J].InternationalJournal for Numerical Methods in Engineering,1999,(45):1695～1724.
[4]Lubliner J,Oliver J,Oller S,Onate E.A plastic-damage model for concrete[J].International Journal of Solids and Structures,1989,25(3):299～326.
[5]Lee J,Fenves L G.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Structural Engineering,2004,130(12):1997～2005.
[6]潘坚文,王进廷,张楚汉.超强地震作用下拱坝的损伤开裂分析[J].水利学报,2007,38(2):143～149.PAN Jianwen,WANG Jinting,ZHANG Chuhan.Analysis of damage and cracking in arch dams subjected to extremely strongearthquake[J].Journal of Hydraulic Engineering,2007,38(2):143～149.(in Chinese)
[7]杜荣强,林皋,陈士海,等.强地震作用下高拱坝的破坏分析[J].水利学报,2010,41(5):567～574.DU Rongqiang,LIN Gao,CHEN Shihai,et al.Failure analysis of high arch dam subjected to strong earthquake[J].Journal ofHydraulic Engineering,2010,41(5):567～574.(in Chinese)
[8]陈厚群,张艳红.评判高混凝土坝地震灾变的关键问题探讨[C].//中国工程院2010流域水安全与重大工程安全高层论坛论文集,2010:182～187.CHEN Houqun,ZHANG Yanhong.On the key problem of evaluating the seismic catastrophe of high concrete dams[C].//TheSymposium of 2010 China Engineering Academy Security of Watershed and Major Engineering Forum[C].2010:182～187.(inChinese)
[9]谷音,刘晶波,杜义欣.三维一致粘弹性人工边界及等效粘弹性边界单元[J].工程力学,2007,24(12):31～37.GU Yin,LIU Jingbo,DU Yixin.3D consistent viscous-spring artificial boundary and viscous-spring boundary element[J].Engineering Mechanics,2007,24(12):31～37.(in Chinese)
[10]程恒,张燎军,张汉云.等效三维一致黏弹性边界单元及其在拱坝抗震分析中的应用[J].水力发电学报,2009,28(5):169～173.CHENG Heng,ZHANG Liaojun,ZHANG Hanyun.Application of 3D consistent equivalent viscous-spring boundary element toseismic analysis of arc dam[J].Journal of Hydroelectric Engineering,2009,28(5):169～173.(in Chinese)
[2]Faria R,Oliver J,Cervera M.A strain-based plastic viscous-damage model for massive concrete structures[J].InternationalJournal of Solids Structures,1998,35(14):1533～1558.
[3]Valliappan S,Yazdchi M,Khalili N.Seismic analysis of arch dams—a continuum damage mechanics approach[J].InternationalJournal for Numerical Methods in Engineering,1999,(45):1695～1724.
[4]Lubliner J,Oliver J,Oller S,Onate E.A plastic-damage model for concrete[J].International Journal of Solids and Structures,1989,25(3):299～326.
[5]Lee J,Fenves L G.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Structural Engineering,2004,130(12):1997～2005.
[6]潘坚文,王进廷,张楚汉.超强地震作用下拱坝的损伤开裂分析[J].水利学报,2007,38(2):143～149.PAN Jianwen,WANG Jinting,ZHANG Chuhan.Analysis of damage and cracking in arch dams subjected to extremely strongearthquake[J].Journal of Hydraulic Engineering,2007,38(2):143～149.(in Chinese)
[7]杜荣强,林皋,陈士海,等.强地震作用下高拱坝的破坏分析[J].水利学报,2010,41(5):567～574.DU Rongqiang,LIN Gao,CHEN Shihai,et al.Failure analysis of high arch dam subjected to strong earthquake[J].Journal ofHydraulic Engineering,2010,41(5):567～574.(in Chinese)
[8]陈厚群,张艳红.评判高混凝土坝地震灾变的关键问题探讨[C].//中国工程院2010流域水安全与重大工程安全高层论坛论文集,2010:182～187.CHEN Houqun,ZHANG Yanhong.On the key problem of evaluating the seismic catastrophe of high concrete dams[C].//TheSymposium of 2010 China Engineering Academy Security of Watershed and Major Engineering Forum[C].2010:182～187.(inChinese)
[9]谷音,刘晶波,杜义欣.三维一致粘弹性人工边界及等效粘弹性边界单元[J].工程力学,2007,24(12):31～37.GU Yin,LIU Jingbo,DU Yixin.3D consistent viscous-spring artificial boundary and viscous-spring boundary element[J].Engineering Mechanics,2007,24(12):31～37.(in Chinese)
[10]程恒,张燎军,张汉云.等效三维一致黏弹性边界单元及其在拱坝抗震分析中的应用[J].水力发电学报,2009,28(5):169～173.CHENG Heng,ZHANG Liaojun,ZHANG Hanyun.Application of 3D consistent equivalent viscous-spring boundary element toseismic analysis of arc dam[J].Journal of Hydroelectric Engineering,2009,28(5):169～173.(in Chinese)
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