高土石坝动力反应的敏感性分析
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摘要
目前高土石坝抗震设计一般要进行坝体动力敏感性分析,但分析方法还没有共识。为此,以典型200m心墙堆石坝为例,进行了土石坝动力敏感性分析,分析结果表明,坝料动力特性取模量比衰减的上限曲线和阻尼比增长的下限曲线进行组合,坝体的动力反应和地震永久变形均最大,建议作为坝体抗震设计的控制工况。
The sensitivity analyses of seismic response are widely used for aseismic design of high earth-rock dams,but there are different analytical methods.Taking a 200-meter-high core rockfill dam as example,the sensitive analyses are implemented for the seismic response of the dam.The results show that,when the dynamic parameters of dam material is selected by the combination of the upper bound curve of dynamic shear modulus ratio attenuation and lower bound curve of damping ratio,the acceleration and permanent deformation of dam are all largest.So,the combination of dam material dynamic parameters should be as the controlling condition of seismic design.
The sensitivity analyses of seismic response are widely used for aseismic design of high earth-rock dams,but there are different analytical methods.Taking a 200-meter-high core rockfill dam as example,the sensitive analyses are implemented for the seismic response of the dam.The results show that,when the dynamic parameters of dam material is selected by the combination of the upper bound curve of dynamic shear modulus ratio attenuation and lower bound curve of damping ratio,the acceleration and permanent deformation of dam are all largest.So,the combination of dam material dynamic parameters should be as the controlling condition of seismic design.
引文
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[2]林皋.土石坝抗震的发展现状与评述[R].大连:大连理工大学,2009.
[3]顾淦臣,沈长松,岑威钧.土石坝地震工程学[M].北京:中国水利水电出版社,2009.
[4]中国水利水电科学研究院.糯扎渡水电站坝料动力特性试验研究报告[R].北京:中国水利水电科学研究院,2003.
[5]沈珠江,徐刚.堆石料的动力变形特性[J].水利水运科学研究,1996(2):143-150.
[6]王昆耀,常亚屏,陈宁.往返荷载下粗粒土的残余变形特性[J].土木工程学报,2000(3):48-53.
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