大岗山拱坝-地基体系整体抗震安全性研究
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摘要
基于高拱坝-地基整体抗震安全评价体系,对设计地震动峰值加速度达0.5565g的大岗山拱坝-地基体系的地震响应进行数值分析,并分别对其在不同地震超载倍数和不同基岩控制性滑裂面抗剪强度降低倍数下的安全性和破坏机理进行研究,以寻求坝体控制性位移或与位移相关的变量随安全系数变化曲线的拐点作为整体失稳判断准则,进一步明确了具体实施方法,并对其整体抗震安全性作出评价。
Based on the integral seismic safety concept of clam-foundation system for arch dam,a corresponding analytical technique using FEM was developed.In this paper,the seismic safety of Dagangshan Arch Dam subjected to a design peak ground acceleration of 0.557 5g resulted in seismic overloading and shear strength reduction of the slide surfaces in the wedges are investigated respectively.In the numerical model,dam-reservoir-foundation interaction and nonlinear contact between contraction joints,dam-foundation interface as well as slide surfaces in abutment wedges are taken into account.Both dam body and critical abutment wedge are treated as an integral system and the system safety are determined by one single safety criterion,defined as the point of inflection of the relationship curve between dam displacement and seismic overloading factor or shear strength reduction factor.
Based on the integral seismic safety concept of clam-foundation system for arch dam,a corresponding analytical technique using FEM was developed.In this paper,the seismic safety of Dagangshan Arch Dam subjected to a design peak ground acceleration of 0.557 5g resulted in seismic overloading and shear strength reduction of the slide surfaces in the wedges are investigated respectively.In the numerical model,dam-reservoir-foundation interaction and nonlinear contact between contraction joints,dam-foundation interface as well as slide surfaces in abutment wedges are taken into account.Both dam body and critical abutment wedge are treated as an integral system and the system safety are determined by one single safety criterion,defined as the point of inflection of the relationship curve between dam displacement and seismic overloading factor or shear strength reduction factor.
引文
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[2]张伯艳,涂劲,陈厚群.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
[3]涂劲,陈厚群,张伯艳.小湾拱坝在不同概率水平的地震作用下抗震安全性研究[J].水利学报,2006,37(3):278-285
[4]廖振鹏.工程波动理论导论[M].北京:科学出版社,2002.
[5]刘晶波,王铎.考虑界面摩擦影响的可接触型裂纹动态分析的动接触力模型[C]//弹性动力学最新进展.北京:科学出版社,1995.
[6]涂劲.有缝界面的混凝土高坝-地基系统非线性地震波动反应分析[D].北京:中国水利水电科学研究院,1999.
[7]汝乃华,姜忠胜.大坝事故与安全[M].北京:中国水利水电出版社,1995.
[8]DL5073-2000,水工建筑物抗震设计规范[S].
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