Dynamic model and multi-factor coupling simulation of nonlinear interaction among dam-reservoir water-foundation under stepped terrain

被引：0
|
作者：
Hu Z. [1 ,2 ]
Li J. [1 ,2 ]
Li Z. [3 ]
Lin G. [1 ,2 ]
机构：
[1] State Key Lab oratory ofCoastal and Offshore Engineering, Dalian University ofTechnology, Dalian
[2] Institute ofEarthquake Engineering, Faculty ofInfrastructure Engineering, Dalian University ofTechnology, Dalian
[3] Earthquake Engineering Research Center, China Institute ofWater Resources and Hydropow er Research, Beijing
来源：
Shuili Xuebao/Journal of Hydraulic Engineering | 2023年 / 54卷 / 07期
关键词：
concrete gravity dam; damage assessment; nonlinear interaction; reser? voir bottom absorption; stepped terrain; wave theory;
D O I：
10.13243/j.cnki.slxb.20220800
中图分类号：
学科分类号：
摘要：
In order to more finely simulate the seismic response of concrete dams at stepped terrain dam sites under consideration of multiple factors such as material nonlinearity and reservoir bottom absorption coupling, it is neces? sary to develop applicable dynamic models for dam- reservoir water- foundation nonlinear interactions, of which rea? sonable ground vibration input is one of the primary problems faced. Based on the wave field separation principle and the stress free condition on the slope surface, this paper proposes a computational method for solving the free field of stepped foundation and an earthquake input method for the dam- foundation system under this site condition,which can reflect the effect of stepped terrain on the dynamic response of the dam more accurately. The dam-reser?voir- stepped foundation full- domain model is established, which can comprehensively consider the dam- reservoirand the dam- complex site dynamic interactions as well as the nonlinear mechanical properties of dam concrete and near- field bedrock, thus improving the rationality of the overall seismic safety evaluation of the gravity dam. The validity of the input method is verified by numerical examples of the site response analysis and the scattering analy? sis. Then, taking a gravity dam as an example, the influence laws of site conditions on the damage evolution of the dam under combined static load- earthquake are studied. The results show that the energy dissipation effect of the silt cover layer located outside around one times the height of the dam away from the dam heel has a minimal impact on the seismic damage of the dam; the plasticity of the rock foundation mainly starts from the heel of the dam, leading to a reduction of damage at the heel and a change in the displacement response of the dam, which has a greater effect in the horizontal direction. © 2023 China Water Power Press. All rights reserved.
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页码：843 / 856
页数：13
相关论文
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