考虑地基非线性的混凝土高坝地震损伤研究  

Seismic damage research of concrete dam considering the foundation material nonlinearity

作　　者：李峰[1] 郑晓东[1,2] 马静[1,3] 穆征[1] 

机构地区：[1]河北工程大学水利水电学院,河北邯郸056038 [2]西安理工大学水利水电学院,陕西西安710048 [3]科技部科技评估中心,北京100081

出　　处：《河北工程大学学报（自然科学版）》2017年第2期56-61,共6页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：河北省教育厅专业学位教学案例建设项目(KCJSZ2017078);邯郸市科技局项目(1521109072)

摘　　要：针对传统的线弹性模型不能准确模拟强震区碾压混凝土重力坝的地震响应问题,本文分析了坝体和地基同时考虑材料非线性时的鲁迪拉碾压混凝土坝地震损伤特性,其主要结论如下:地基岩体和坝体均采用非线性材料时,与坝趾相接处的地基产生损伤开裂,并随着地震动的持续,损伤裂缝逐渐向地基深度方向扩展,从而使得坝体应力重新分布,坝基交界处的应力集中释放,导致坝基交界处不会产生地震损伤。因此,坝体产生的地震损伤区域和损伤程度均有所减小,使坝体更偏安全,其结果更接近实际。The traditional linear elastic model cannot simulate the nonlinear seismic response analysis of RCC gravity dam in strong seismic regions. This paper analyzes？the seismic damage characteristics of Ludila RCC dam, when dam and foundation material nonlinearity？ are considered at the same time. The main conclusions are as follows： When the foundation rock mass and the dam use the nonlinear materials, the foundation near dam toe is damaged, and with the continuous ground motion, the damage cracks extend gradually to the depth of the foundation. Thus, the stress redistribution of dam body and the stress concentration release at the juncture of dam foundation, which will not cause the earthquake damage at the dam foundation junction. Therefore the earthquake damage area and damage degree of the dam are reduced, which makes the dam more partial safety. The result will be more close to the actual, which has certain reference significance to the guiding project.

关 键 词：混凝土高坝 材料非线性 损伤模型 坝体-地基岩体动态耦合 

分 类 号：TV3[水利工程—水工结构工程]