《Water Science and Engineering》刊登“带有渗透裂缝的混凝土重力坝的抗震稳定性分析”

作者：Shou-yan JIANG, Cheng-bin DU
刊物：《Water Science and Engineering》，2012年1月，第5卷第1期，105-119页
关键词：抗震稳定；混凝土重力坝；渗透裂缝；塑性损伤模型；硬接触算法；库伦摩擦模型；裂缝开度
摘要：本文研究了裂缝大坝的抗震稳定性检测问题，并考虑了裂缝处的几何非线性和大变形以及接触条件。首先利用以非线性有限元法为基础的混凝土塑性损伤模型确定渗透裂缝的位置。然后用硬接触算法模拟裂缝在法线方向的相互作用，并利用库伦摩擦模型模拟裂缝在切线方向的相互作用。通过实例的研究验证数值模型后，对具有两种不同渗透裂缝和不同峰值加速度的koyna大坝的抗震稳定性进行了详细讨论，同时也讨论了裂缝大坝的破坏过程。结果表明：具有两种类型渗透裂缝的大坝可在与以前koyna大地震相同震级的地震中能确保稳定，且裂缝大坝具有很大的抗震能力。在强震中裂缝大坝的破坏过程可以分为两个阶段：滑移阶段和倾覆阶段。滑移阶段末期接近峰值加速度，在倾覆发生之前顶部块体可以沿裂缝滑移很长距离。顶部块体的最大滑移位移将随着裂缝处摩擦系数的增加而减小。

Seismic stability analysis of concrete gravity dams with penetrated cracks

Authors：Shou-yan JIANG, Cheng-bin DU
Journal：Water Science and Engineering，2012, 5(1): 105-119
Key Word：seismic stability; concrete gravity dam; penetrated crack; plastic-damage model; hard contact algorithm; Coloumb friction model; joint opening
Abstract：The seismic stability of a cracked dam was examined in this study. Geometric nonlinearity and large deformations, as well as the contact condition at the crack site, were taken into consideration. The location of penetrated cracks was first identified using the concrete plastic-damage model based on the nonlinear finite element method (FEM). Then, the hard contact algorithm was used to simulate the crack interaction in the normal direction, and the Coloumb friction model was used to simulate the crack interaction in the tangential direction. After verification of numerical models through a case study, the seismic stability of the Koyna Dam with two types of penetrated cracks is discussed in detail with different seismic peak accelerations, and the collapse processes of the cracked dam are also presented. The results show that the stability of the dam with two types of penetrated cracks can be ensured in an earthquake with a magnitude of the original Koyna earthquake, and the cracked dam has a large earthquake-resistant margin. The failure processes of the cracked dam in strong earthquakes can be divided into two stages: the sliding stage and the overturning stage. The sliding stage ends near the peak acceleration, and the top block slides a long distance along the crack before the collapse occurs. The maximum sliding displacement of the top block will decrease with an increasing friction coefficient at the crack site.

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翻译：燕家琪；审核：安鹏