官地重力坝静动力分析
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摘要
对官地混凝土重力坝进行了三维静动力线弹性和非线性有限元分析。非线性分析中用LDDA方法模拟了挡水坝段坝头折坡附近碾压层面、坝基面以及深部滑裂面的力学行为,用粘弹性边界模拟了地震动能量向无限远域逸散的地基"辐射阻尼"效应。计算结果表明,非线性有限元分析所得动力反应较线性有限元(未考虑无限地基辐射阻尼影响)有明显减小(挡水坝段坝趾处主压应力除外)。主要得出了以下可供工程设计参考的结论:挡水坝段坝头折坡处主拉应力较大,需合理配筋;坝趾处主压应力较大,需采取适当措施处理;在计入无限地基辐射阻尼影响后,官地重力坝能达到校核地震作用下的"不溃坝"功能目标。
A 3-D static and dynamic linear elastic and nonlinear finite element analysis is made on Guandi Gravity Dam.During the nonlinear analysis,the mechanical behaviors of the dam foundation surface,deep slip surface and the roller compacted layer near the folding of the abutment of the water retaining section of the dam are simulated with LDDA method,and then the foundation radiation damping effect of the seismic motion energy dissipating towards infinite domain is simulated as well.The results show that the dynamic response obtained from the nonlinear finite element analysis is much smaller than that from the linear one(without considering the radiation damping of foundation),except the principal compressive stress at dam toe;from which the conclusion that can be provided as the reference for the engineering design concerned is mainly obtained that the reasonable reinforcement must be arranged at the folding of the abutment,as tensile stress is larger therein;suitable treatment must be done at the dam toe for the larger principal compressive stress there and then the target of "non-failure dam" under the check seismic effect can be got for Guandi Gravity Dam.
A 3-D static and dynamic linear elastic and nonlinear finite element analysis is made on Guandi Gravity Dam.During the nonlinear analysis,the mechanical behaviors of the dam foundation surface,deep slip surface and the roller compacted layer near the folding of the abutment of the water retaining section of the dam are simulated with LDDA method,and then the foundation radiation damping effect of the seismic motion energy dissipating towards infinite domain is simulated as well.The results show that the dynamic response obtained from the nonlinear finite element analysis is much smaller than that from the linear one(without considering the radiation damping of foundation),except the principal compressive stress at dam toe;from which the conclusion that can be provided as the reference for the engineering design concerned is mainly obtained that the reasonable reinforcement must be arranged at the folding of the abutment,as tensile stress is larger therein;suitable treatment must be done at the dam toe for the larger principal compressive stress there and then the target of "non-failure dam" under the check seismic effect can be got for Guandi Gravity Dam.
引文
[1]张伯艳,褚志生.对水工建筑物设计反应谱的人工波合成[J].工程抗震,2002,(3):27-31.
[2]张伯艳.高拱坝坝肩抗震稳定研究[D].西安:西安理工大学,2005.
[3]刘云贺,张伯艳,陈厚群.拱坝地震输入模型中粘弹性边界与粘性边界的比较[J].水利学报,2006,37(6):758-763.
[4]DL 5073—2000,水工建筑物抗震设计规范[S].
[2]张伯艳.高拱坝坝肩抗震稳定研究[D].西安:西安理工大学,2005.
[3]刘云贺,张伯艳,陈厚群.拱坝地震输入模型中粘弹性边界与粘性边界的比较[J].水利学报,2006,37(6):758-763.
[4]DL 5073—2000,水工建筑物抗震设计规范[S].
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