重力坝坝头孤立坝体在地震作用下的抗滑分析
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摘要
假设坝头处的贯穿性裂缝为一水平直线型裂缝,尝试用Newmark滑块位移法和普通的线弹性有限元时程分析相结合,近似计算这种带有贯穿性裂缝重力坝的上部孤立坝体在地震荷载中产生的滑动位移,评估了其抗震性能,并将Newmark法所得的结果与有限元接触模型的结果做了对比。计算结果表明这种受到损害的坝体确实具备一定的抗震能力,Newmark滑块位移法在合适的条件下能得到很好的结果,可用于近似计算已受损的重力坝上部孤立坝体在地震荷载中产生的滑动位移。
In this paper,the penetrating crack in gravity dam's upper area is supposed to be a horizontal straight one,and the Newmark sliding-block method combined with the elastic time-history analysis of finite element method(FEM) is used to approximately compute the upper dam block's slipping displacement in earthquake,then based on the compatation results,the dam's seismic capacity is evaluated.In order to check the method in this paper,the results are compared to the ones computed by the FEM contact method.According to the results,it is shown that the dam in such a badly damaged condition would contain some seismic capacity,and the method used in this paper could generate good results under proper conditions,so the method could be used to approximately compute the slipping displacement of the destroyed dam's upper block in earthquake.
In this paper,the penetrating crack in gravity dam's upper area is supposed to be a horizontal straight one,and the Newmark sliding-block method combined with the elastic time-history analysis of finite element method(FEM) is used to approximately compute the upper dam block's slipping displacement in earthquake,then based on the compatation results,the dam's seismic capacity is evaluated.In order to check the method in this paper,the results are compared to the ones computed by the FEM contact method.According to the results,it is shown that the dam in such a badly damaged condition would contain some seismic capacity,and the method used in this paper could generate good results under proper conditions,so the method could be used to approximately compute the slipping displacement of the destroyed dam's upper block in earthquake.
引文
[1]陈厚群,徐泽平,李敏.汶川大地震和大坝抗震安全[J].水利学报,2008,39(10):1158-1167.
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[5]邓学晶,孔宪京,杜永峰,等.基于Newmark滑块系统能量分析的地震永久位移计算方法[J].兰州理工大学学报,2010,36(5):104-107.
[6]陈云敏,柯瀚,凌道盛.城市垃圾填埋体的动力特性及地震响应[J].土木工程学报,2002,35(3):66-72.
[7]Westergaard H M.Water pressures on dams during earth-quakes[J].Transactions ofthe American Society of Civil En-gineers,1933,98(2):418-433.
[2]Pekau O A,Cui Y.Seismic Collapse Behaviour of DamagedDams[C].2004.
[3]金峰,周建平.重力坝在校核地震工况下核算方法的建议[J].水力发电,2009,35(4):31-33,41.
[4]Newmark N M.Effects of earthquakes on dams and embank-ments[J].Geotchnique,1965,15(2):139-160.
[5]邓学晶,孔宪京,杜永峰,等.基于Newmark滑块系统能量分析的地震永久位移计算方法[J].兰州理工大学学报,2010,36(5):104-107.
[6]陈云敏,柯瀚,凌道盛.城市垃圾填埋体的动力特性及地震响应[J].土木工程学报,2002,35(3):66-72.
[7]Westergaard H M.Water pressures on dams during earth-quakes[J].Transactions ofthe American Society of Civil En-gineers,1933,98(2):418-433.
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