官地重力坝极限抗震能力初探
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摘要
考虑官地混凝土重力坝非溢流坝段头部碾压层面、坝基面以及深部滑裂面在地震作用下的开裂破坏,计入地震动能量向无限远域地基逸散的地基"辐射阻尼"效应,综合分析坝顶顺河向相对位移、缝面开合情况和开裂范围以及建基面开裂对灌浆帷幕的影响等,初步研究了官地混凝土重力坝的极限抗震能力,获得官地重力坝超设计地震的超载安全系数约为1.3。
The ultimate aseismic ability of Guandi concrete gravity dam is preliminarily studied to improve the design of non-overflow monoliths.Nonlinear behaviors of various contacts under strong earthquakes are examined,including contacts of roller-compacted layers at the head of dam,dam foundation surface and deep slip surface.Foundation damping is considered to reflect energy dissipation of seismic ground motion through radiation outwards to the surounding foundation.Various effects on grout curtain are comprehensively analyzed,the effects of relative streamwise displacement at the dam crest,contacts opening and closing and opening range.Results show that relative to the design earthquake,the overloading safety factor of Guandi gravity dam is about 1.3.
The ultimate aseismic ability of Guandi concrete gravity dam is preliminarily studied to improve the design of non-overflow monoliths.Nonlinear behaviors of various contacts under strong earthquakes are examined,including contacts of roller-compacted layers at the head of dam,dam foundation surface and deep slip surface.Foundation damping is considered to reflect energy dissipation of seismic ground motion through radiation outwards to the surounding foundation.Various effects on grout curtain are comprehensively analyzed,the effects of relative streamwise displacement at the dam crest,contacts opening and closing and opening range.Results show that relative to the design earthquake,the overloading safety factor of Guandi gravity dam is about 1.3.
引文
[1]中华人民共和国电力行业标准,《水工建筑物抗震设计规范》[S](DL5073-2000).北京:中国电力出版社,2001年.Specifications for Seismic Design of Hydraulic Structures[S](DL5073-2000).Beijing:China Electric Power Press,2001.(in Chinese)
[2]中国水利水电科学研究院.小湾拱坝超设计概率水平地震作用及极限抗震性能的试验研究报告[R].北京:中国水利水电科学研究院,2004,10.China Institute of Water Resources and Hydropower Research,The Limit Aseismic Performance Test of Xiaowan Arch Dam for Superdesign probability levels earthquakes[R].Beijing:IWHR,2004.(in Chinese)
[3]张伯艳,陈厚群,涂劲.基于动接触力法的拱坝抗震稳定有限元分析[J].水利学报,2004,(10):7～12.Zhang Boyan,Chen Houqun,Tu Jing.Improved FEM based on dynamic contact force method for analyzing the stability of archabutment[J].Journal of Hydraulic Engineering,2004,(10):7～12.(in Chinese)
[4]涂劲,陈厚群,张伯艳.小湾拱坝在不同概率水平地震作用下的抗震安全性研究[J].水利学报,2006,37(3):278～285.Tu Jin,Chen Houqun,Zhang Boyan.Seismic safety of high arch dam in Xiaowan Project under the action of earthquakes withdifferent exceeding probabilities[J].Journal of Hydraulic Engineering,2006,37(3):278～285.(in Chinese)
[5]US Army Corps of Engineers,Earthquake Design and Evaluation of Concrete Hydraulic Structures,EM1110-2-6053,1May2007.
[6]张伯艳,陈厚群.LDDA动接触力的迭代算法[J],工程力学,2007,24(6):1～6.Zhang Boyan,Chen Houqun.A new LDDA iterative algorithm for dynamic contact forces[J].Engineering Mechanics,2007,24(6):1～6.(in Chinese)
[7]刘云贺,张伯艳,陈厚群.拱坝地震输入模型中黏弹性边界与黏性边界的比较[J].水利学报,2006,37(6):758～763.Liu Yunhe,Zhang Boyan,Chen Houqun.Comparison of spring-viscous boundary with viscous boundary for arch dam seismic inputmodel[J].Journal of Hydraulic Engineering,2006,37(6):758～763.(in Chinese)
[2]中国水利水电科学研究院.小湾拱坝超设计概率水平地震作用及极限抗震性能的试验研究报告[R].北京:中国水利水电科学研究院,2004,10.China Institute of Water Resources and Hydropower Research,The Limit Aseismic Performance Test of Xiaowan Arch Dam for Superdesign probability levels earthquakes[R].Beijing:IWHR,2004.(in Chinese)
[3]张伯艳,陈厚群,涂劲.基于动接触力法的拱坝抗震稳定有限元分析[J].水利学报,2004,(10):7～12.Zhang Boyan,Chen Houqun,Tu Jing.Improved FEM based on dynamic contact force method for analyzing the stability of archabutment[J].Journal of Hydraulic Engineering,2004,(10):7～12.(in Chinese)
[4]涂劲,陈厚群,张伯艳.小湾拱坝在不同概率水平地震作用下的抗震安全性研究[J].水利学报,2006,37(3):278～285.Tu Jin,Chen Houqun,Zhang Boyan.Seismic safety of high arch dam in Xiaowan Project under the action of earthquakes withdifferent exceeding probabilities[J].Journal of Hydraulic Engineering,2006,37(3):278～285.(in Chinese)
[5]US Army Corps of Engineers,Earthquake Design and Evaluation of Concrete Hydraulic Structures,EM1110-2-6053,1May2007.
[6]张伯艳,陈厚群.LDDA动接触力的迭代算法[J],工程力学,2007,24(6):1～6.Zhang Boyan,Chen Houqun.A new LDDA iterative algorithm for dynamic contact forces[J].Engineering Mechanics,2007,24(6):1～6.(in Chinese)
[7]刘云贺,张伯艳,陈厚群.拱坝地震输入模型中黏弹性边界与黏性边界的比较[J].水利学报,2006,37(6):758～763.Liu Yunhe,Zhang Boyan,Chen Houqun.Comparison of spring-viscous boundary with viscous boundary for arch dam seismic inputmodel[J].Journal of Hydraulic Engineering,2006,37(6):758～763.(in Chinese)
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