浩口混凝土重力坝非溢流坝段抗震安全评价
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摘要
根据浩口水电站工程的实际情况,采用三维有限元法,建立了混凝土重力坝非溢流坝典型坝段的三维有限元模型。在获得坝体静力场的基础上,将动力分析反应谱法计算所得的动力分析结果与大坝在正常蓄水工况下静力分析成果进行叠加,得到大坝在静动力作用下的坝体应力。据此,根据刚体极限平衡原理对大坝进行强度和抗滑稳定性分析和评价。结果表明,大坝在设计地震作用下强度满足规范要求,坝基面抗滑稳定安全系数4.4,大于规范允许最小安全系数。因此,坝体是安全的。
According to the actual conditions of Haokou hydropower station,a three-dimensional finite element model was developed for the typical non-overflow section of Haokou concrete gravity dam.Based on the static field of the dam,the dynamic analysis results obtained from the response spectrum method were superimposed with the static analysis results determined by the normal storage of the dam,which provided the dam stress under the static and dynamic forces.The strength and ability against sliding of the dam were analyzed and evaluated using the rigid body limit equilibrium theory.The results demonstrated that the strength of the dam meets the standard requirement under the design earthquake action.The safety factor against sliding the dam foundation was 4.4,which was greater than the minimum safety factor allowed by the standard,and therefore the dam is safe.
According to the actual conditions of Haokou hydropower station,a three-dimensional finite element model was developed for the typical non-overflow section of Haokou concrete gravity dam.Based on the static field of the dam,the dynamic analysis results obtained from the response spectrum method were superimposed with the static analysis results determined by the normal storage of the dam,which provided the dam stress under the static and dynamic forces.The strength and ability against sliding of the dam were analyzed and evaluated using the rigid body limit equilibrium theory.The results demonstrated that the strength of the dam meets the standard requirement under the design earthquake action.The safety factor against sliding the dam foundation was 4.4,which was greater than the minimum safety factor allowed by the standard,and therefore the dam is safe.
引文
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[14]张新培,陈颖.小震作用下抗震结构时程可靠度计算方法[J].工程力学,2003,20(1):153-156.(ZHANG Xin-pei,CHENYing.A Method for Time-history Reliability Analysis of As-tigmatic Structures under Frequent Earthquake[J].Engineer-ing Mechanics,2003,20(1):153-156.(in Chinese))
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[16]黄宜胜,李建林,常晓林.基于振型分解反应谱法的重力坝抗震安全评价[J].三峡大学学报,2010,(6):11-16.(HUANGYi-sheng,LI Jian-lin,CHANG Xiao-lin.Seismic Safety Evalu-ation of Gravity Dam Based on the Mode-decomposition Re-sponse Spectrum Method[J].Journal of China Three GorgesUniversity,2010,(6):11-16.(in Chinese))
[2]余卫平,耿克勤,汪小刚,等.某水电站碾压混凝土坝三维非线性有限元分析[J].水利与建筑工程学报,2006,4(2):6-10.(YUWei-ping,GENG Ke-qin,WANG Xiao-gang,et al.A HydropowerStation in Roller Compacted Concrete Dam Three-dimensional Non-linear Finite Element Analysis[J].Water Resources and Architec-tural Engineering,2006,4(2):6-10.(in Chinese))
[3]甘磊,沈振中,凌春海,等.马堵山重力坝动力响应分析及安全评价[J].水电能源科学,2010,28(7):78-81.(GAN Lei,SHENZhen-zhong,LING Chun-hai,et al.Madushan Gravity DynamicResponse Analysis and Safety Evaluation[J].Water Resourcesand Power,2010,28(7):78-81.(in Chinese))
[4]李同春,胡继刚,赵兰浩,等.基于反应谱法的重力坝有限元等效动应力响应分析[J].水力发电学报,2009,28(5):19-22.(LITong-chun,HU Ji-gang,ZHAO Lan-hao.Equivalent DynamicStress Response Based on the Gravity of the Response Spec-trum Method Finite Element Analysis[J].Hydroelectric Engi-neering,2009,28(5):19-22.(in Chinese))
[5]陈雯,李听,周晶.混凝土重力坝整体动力特性研究[J].世界地震工程,2006,22(4):63-69.(CHEN Wen,LI Ting,ZHOU Jing.O-verall Dynamic Characteristics of Concrete Gravity Dam[J].WorldEarthquake Engineering,2006,22(4):63-69.(in Chinese))
[6]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.(LIN Gao,CHEN Jian-yun.Concrete DamSeismic Safety Evaluation[J].Journal of Hydraulic Engineer-ing,2001,(2):8-15.(in Chinese))
[7]林皋.混凝土大坝抗震技术的发展现状与展望(Ⅱ)[J].水科学与工程技术;2005,(1):1-3.(LIN Gao.The Concrete Dam SeismicTechnology Development Status and Prospect(Ⅱ)[J].Water Sci-ences and Engineering Technology;2005,(1):1-3.(in Chinese))
[8]赵永宣.应用ANSYS软件进行大坝动力计算机抗震分析[J].水利发电,2000,(12):57-59.(ZHAO Yong-xuan.By ANSYSDam Power Computer Seismic Analysis[J].Hydroelectric,2000,(12):57-59.(in Chinese))
[9]郝文化.ANSYS土木工程应用实例[M].北京:中国水利水电出版社,2005.(HAO Wen-hua.ANSYS Instances of Civil En-gineering Applications[M].Beijing:China Water Power Press,2005.(in Chinese))
[10]DL5073-2000,水工建筑物抗震设计规范[S].(DL5073-2000,Specification for Seismic Design of the Hydraulic Struc-tures[S].(in Chinese))
[11]Coulg R W,Cheng K T,Chen Houqun,et al.Dynamic Interac-tion Effects in Arch Dams Report No.EERC-85/11[R].Berkeley:Earthquake Engineering Research Center,Universi-ty of California,1985.
[12]范书立,陈健云,范武强,等,地震作用下碾压混凝土重力坝的可靠度分析[J].岩石力学与工程学报,2008,(3):564-571.(FAN Shu-li,CHEN Jian-yun,FAN Wu-qiang,et al.Reliabili-ty Analysis of Roller Compacted Concrete Gravity Dams Sub-jected to Earthquake[J].Chinese Journal of Rock Mechanicsand Engineering,2008,(3):564-571.(in Chinese))
[13]李振富,王目宣.重力坝抗震动力可靠度分析[J].天津大学学报,1995,28(5):668-672.(LI Zhen-fu,WANG Ri-xuan.Earth-quake-proof Dynamical Reliability Analysis of Gravity Dam[J].Journal of Tianjin University,1995,28(5):668-672.(in Chinese))
[14]张新培,陈颖.小震作用下抗震结构时程可靠度计算方法[J].工程力学,2003,20(1):153-156.(ZHANG Xin-pei,CHENYing.A Method for Time-history Reliability Analysis of As-tigmatic Structures under Frequent Earthquake[J].Engineer-ing Mechanics,2003,20(1):153-156.(in Chinese))
[15]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1989.(GU Gan-chen.Embankment Dam on Earthquake Engineering[M].Nanjing:Hohai University Press,1989.(in Chinese))
[16]黄宜胜,李建林,常晓林.基于振型分解反应谱法的重力坝抗震安全评价[J].三峡大学学报,2010,(6):11-16.(HUANGYi-sheng,LI Jian-lin,CHANG Xiao-lin.Seismic Safety Evalu-ation of Gravity Dam Based on the Mode-decomposition Re-sponse Spectrum Method[J].Journal of China Three GorgesUniversity,2010,(6):11-16.(in Chinese))
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