基于坝基塑性损伤的重力坝极限抗震能力研究
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Research on ultimate seismic capacity of gravity dam considering plastic damage of dam foundation
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    摘要:

    目前关于重力坝的研究大多仅考虑坝体的损伤破坏,而将坝基设为线弹性材料,这可能导致大坝震害情况与实际不符,而考虑坝基塑性损伤能明显减轻重力坝坝体损伤程度,可以更加真实的模拟出大坝的抗震承载能力。本文基于塑性损伤力学理论,以我国西南某拟建重力坝为研究对象,建立了考虑坝体-坝基整体塑性损伤的三维有限元动力计算模型,并对模型的正确性进行了验证。采用时程分析法分析了该重力坝在不同地震强度下的震损情况,并以坝体裂缝贯通上下游为失稳判别标准对该坝的极限抗震能力进行了评价。结果表明:当地震动强度为0.5g时,下游折坡处损伤区域贯通上游,此时重力坝上部坝体可视为脱离块体,重力坝产生失稳,因此可以判定该重力坝的极限抗震能力为0.5g。

    Abstract:

    At present,most of the research on gravity dam only considers the damage of the dam body,and the dam foundation is made of linear elastic material,which may cause the dam earthquake damage to be inconsistent with the actual situation.Considering the plastic damage of the dam foundation,it can significantly reduce the damage degree of the gravity dam body,which can more realistically simulate the seismic bearing capacity of the dam.Based on the theory of plastic damage mechanics,it takes a proposed gravity dam in the southwest of China as the research object,a three-dimensional finite element dynamic calculation model considering the overall plastic damage of the dam body and the dam foundation is established,and the correctness of the model is verified.The seismic damage of the gravity dam under different earthquakes intensity is analyzed by the time history analysis method,and the ultimate seismic capacity of the dam is evaluated with the dam body cracks penetrating the upstream and downstream as the criterion of instability.The results show that when the ground vibration intensity is 0.5g,the damaged area at the downstream slope is connected to the upstream.Meanwhile,the upper dam body of the gravity dam can be regarded as a detached block,and the gravity dam is unstable.Therefore,the ultimate seismic capacity of the gravity dam can be determined as 0.5g.

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田 晔,吴邦彬,周清勇,高 俊.基于坝基塑性损伤的重力坝极限抗震能力研究[J].江西水利科技,2022,(6):

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  • 在线发布日期: 2023-01-13
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