基于坝基塑性损伤的重力坝极限抗震能力研究  

Research on ultimate seismic capacity of gravity dam considering plastic damage of dam foundation

作　　者：田晔 吴邦彬 周清勇 高俊 TIAN Ye;WU Bangbin;ZHOU Qingyong;GAO Jun(Water Conservancy Bureau of Anyi County,Anyi,Nanchang,330500,China;Nanchang Institute of Technology,Nanchang,Jiangxi,330099,China;Jiangxi Academy of Water Science and Engineering,Nanchang,Jiangxi,330029,China;Nanchang County Lianwei Channel and Dike Center of Jiangxi Province,Nanchang Jiangxi,330200,China)

机构地区：[1]江西省安义县水利局,江西安义330500 [2]南昌工程学院,江西南昌330099 [3]江西省水利科学院,江西南昌330029 [4]江西省南昌县联圩河道堤防中心,江西南昌330200

出　　处：《江西水利科技》2022年第6期395-400,共6页Jiangxi Hydraulic Science & Technology

基　　金：江西省水利厅科技项目(202022YBKT09).

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。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.

关 键 词：混凝土重力坝 坝基非线性 时程分析法 极限抗震能力 

分 类 号：TV312[水利工程—水工结构工程]