高土石坝地震动力响应特征弹塑性有限元分析
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摘要
我国的高土石坝主要分布在水利水电资源最为丰富的西南地区,而这些地区多位于强震带,研究高土石坝地震作用下的动力响应特征对于大坝的设计和安全评价有着重要的意义。本文采用数值计算的方法来研究高心墙土石坝地震作用下的动力响应特征,采用理论构架更为完善的弹塑性模型-非线性方法进行高心墙土石坝二维和三维地震动力响应计算分析。通过和实际工程及传统粘弹性等效线性方法的对比分析,认为弹塑性分析方法能较好地反映土石坝在地震过程中的实时动力响应,在分布规律上比传统方法更为合理。
Most of the high earth-rockfill dams are located in the southwest of China where earthquakes happened frequently,so it is quite significant to study dynamic response of high earth-rockfill dams for the dam design and safety evaluation.In this paper,numerical calculations are performed to study the dynamic response of high earth-rockfill dams.Both 2-dimensional and 3-dimensional dynamic calculations of a high earth-rockfill dam during earthquake are conducted with the program FEMEPDYN based on elasto-plastic model and nonlinear method.According to comparisons with practical projects and traditional methods,the new way is reasonable in describing the dynamic response of high earth-rockfill dam during earthquakes.
Most of the high earth-rockfill dams are located in the southwest of China where earthquakes happened frequently,so it is quite significant to study dynamic response of high earth-rockfill dams for the dam design and safety evaluation.In this paper,numerical calculations are performed to study the dynamic response of high earth-rockfill dams.Both 2-dimensional and 3-dimensional dynamic calculations of a high earth-rockfill dam during earthquake are conducted with the program FEMEPDYN based on elasto-plastic model and nonlinear method.According to comparisons with practical projects and traditional methods,the new way is reasonable in describing the dynamic response of high earth-rockfill dam during earthquakes.
引文
[1]李荣建.土坡中抗滑桩抗震加固机理研究[D].北京:清华大学,2008.
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[4]Zienkiewicz O C,Chan A H C,Pastor M,et al.Computational Geomechanics with Special Reference to Earthquake Engineering[M].NewYork:John Wiley&Sons,1998.
[2]Pastor M,Zienkiewicz O C,Chan A HC.Generalized plasticity and the modeling of soil behavior[J].International Journal for Numerical andAnalytical Methods in Geomechanics,1990,14(3):151-190.
[3]朱百里,沈珠江.计算土力学[M].上海:上海科学技术出版社,1990.
[4]Zienkiewicz O C,Chan A H C,Pastor M,et al.Computational Geomechanics with Special Reference to Earthquake Engineering[M].NewYork:John Wiley&Sons,1998.
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