马堵山重力坝动力响应分析及安全评价
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摘要
根据马堵山碾压混凝土重力坝的工程地质条件,选择典型坝段建立坝体和坝基的三维有限元模型,采用反应谱法计算分析了该坝的动力响应,研究了该坝的位移、应力和地震加速度的响应及其变化规律,并分析了坝体位移和应力在地震作用加载后的变化情况。计算结果表明,在设计地震作用下,坝体的最大动位移为7.59 mm,发生在坝体顶部;坝体的最大动应力为1.8 MPa,出现在坝踵部位;最大动加速度为1.466 m/s2,发生在坝体顶部。该坝在设计地震作用下强度满足要求。
According to the actual engineering conditions of Madushan RCC Gravity Dam,the 3D FEM model of the dam and its foundation was set up.Using the response spectrum method,the seismic response of dam was calculated and analyzed,and the responses of earthquake acceleration,displacement and stress of the dam and their distribution laws were studied,analysis of the changes of the displacement and stress after the seismic loaded.Under the design earthquake loading,the maximum displacement response occurred at the dam crest with 7.59 mm.The stress response of dam body is 1.8 MPa,which occurred at the heel.The maximum acceleration response occurred at the dam crest with 1.466 m/s2.The calculation showed that the intensity of the dam meets the requirements under the design earthquake.
According to the actual engineering conditions of Madushan RCC Gravity Dam,the 3D FEM model of the dam and its foundation was set up.Using the response spectrum method,the seismic response of dam was calculated and analyzed,and the responses of earthquake acceleration,displacement and stress of the dam and their distribution laws were studied,analysis of the changes of the displacement and stress after the seismic loaded.Under the design earthquake loading,the maximum displacement response occurred at the dam crest with 7.59 mm.The stress response of dam body is 1.8 MPa,which occurred at the heel.The maximum acceleration response occurred at the dam crest with 1.466 m/s2.The calculation showed that the intensity of the dam meets the requirements under the design earthquake.
引文
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[2]王燕.重力坝抗滑稳定及地震反应有限元分析和评价[D].南京:河海大学,2009.
[3]裴镔.Hardfill坝地震动力响应的比较分析[J].水电能源科学,2010,28(2):85-88.
[4]沈振中,王燕,贾静,等.马堵山重力坝地震响应三维有限元分析[J].水力发电,2009,35(5):43-45.
[5]Shen Zhenzhong,Wen Xuyu,Lv shengxi.Analysisof Earthquake Responses for Jiudianxia ConcreteFace Rockfill Dam[A].The Proceeding of the In-ternational Symposiac on Dams in the Societies ofthe 21st Century[C].London:Taylor and Francis/Balkema,2006,1:925-930.
[6]中国水利水电科学研究院.水工建筑物抗震设计规范(DL 50732-2000)[S].北京:中国电力出版社,2001.
[7]张甫杰.混凝土重力坝动力响应分析及抗震措施研究[D].大连:大连理工大学,2008.
[8]王燕,沈振中,李怡芬.马堵山溢流坝段应力变形及强度储备系数分析[J].水电能源科学,2009,27(2):100-103.
[9]熊堃,何蕴龙,肖伟.桑郎拱坝整体稳定安全度分析[J].武汉大学学报(工学版),2007,40(4):23-26.
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