鲁地拉重力坝坝基非线性对坝体极限抗震能力的影响研究  

Study on influence of foundation nonlinearity on ultimate seismic capacity of gravity dam of Ludila Hydropower Station

作　　者：徐金英[1,2] 王星 

机构地区：[1]华电电力科学研究院,浙江杭州310030 [2]中国水利水电科学研究院,北京100044

出　　处：《水利水电技术》2016年第2期15-18,共4页Water Resources and Hydropower Engineering

摘　　要：本文以鲁地拉水电站重力坝为例,采用线弹性模型和损伤塑性模型研究了重力坝坝基非线性对坝体极限抗震能力的影响,以坝体顶部折坡处的损伤区贯穿为"破坏"依据,计算了坝体"破坏"前所能承受的最大地震荷载。结果表明:地基线弹性模型和非线性模型得到的结果分别为1.6倍设计地震和2.2倍设计地震。对比分析可知,考虑地基非线性影响能够显著降低重力坝坝体折坡处的损伤分布,近而可以更好地模拟坝体结构本身的抗震承载能力。By taking the gravity dam of Ludila Hydropower Station as the study case,the influence of the foundation nonlinearity on the ultimate seismic capacity of the gravity dam is studied herein with the linear-elastic model and damage-plastic model,i. e.by regarding the penetration of the damaged area at the beveled slope of the dam crest as the＂failure＂basis,the maximum earthquake load that can be endured by the dam body before ＂failure＂is calculated. The result shows that the results from both the foundation linear-elastic model and the non-linear model are 1. 6 times and 2. 2 times of the design earthquake respectively. It is known from the relevant comparative analysis that the consideration of the influence from foundation non-linearity can significantly decrease the damage distribution at the location of the beveled slope of the dam,and then can better simulate the seismic bearing capacity of the dam structure itself.

关 键 词：鲁地拉水电站 重力坝 地基非线性 极限抗震能力 线弹性模型 损伤塑性模型 

分 类 号：TV642.3[水利工程—水利水电工程]