考虑坝体柔性的重力坝坝面地震动水压力计算  

Calculation of earthquake-induced hydrodynamic pressure considering gravity dam flexibility

作　　者：王毅[1] 胡志强 郭维东[1] WANG Yi;HU Zhiqiang;GUO Weidong(College of Water Conservancy, Shenyang Agricultural University, Shenyang 110866, China;Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China)

机构地区：[1]沈阳农业大学水利学院,辽宁沈阳110866 [2]大连理工大学建设工程学部,辽宁大连116024

出　　处：《水利水电科技进展》2019年第3期38-43,共6页Advances in Science and Technology of Water Resources

基　　金：辽宁省教育厅科学研究项目(LSNYB201616);沈阳农业大学教师科研基金(20131003)

摘　　要：为了准确模拟地震作用下重力坝坝面动水压力,采用比例边界有限元与有限元的无缝耦合理论,提出了一种考虑坝体和库底柔性的坝面动水压力计算方法。该方法采用比例边界有限元的理论,可仅离散坝水交界面实现半无限库水的高效高精度模拟,且能方便考虑库水的可压缩性以及库底和岸坡的吸收作用;采用有限元离散坝体结构,通过作用在大坝迎水面上的动水压力实现对大坝-库水系统的求解。算例计算结果表明,该方法计算得到的重力坝坝面动水压力与已有文献计算结果吻合较好;坝体柔性削弱了坝面动水压力;坝面动水压力随库底反射系数的减小而减小。To accurately simulate the hydrodynamic pressure on a gravity dam face during an earthquake, a computing method considering both the flexibility of dam body and reservoir bottom is proposed based on the seamless coupling theory of finite element method and scaled boundary finite element method. By using the scaled boundary finite element method, semi-infinite impounded water can be modeled with high efficiency and accuracy with only discretization of the interface of the reservoir and the dam. In addition, water compressibility and the effect of absorption from reservoir bottom can be conveniently considered. Finite element method is employed to discretize the dam body and the dynamic response of the dam-reservoir system can be solved by the hydrodynamic pressure on the dam face. Numerical examples show that the hydrodynamic pressure calculated by the proposed method agrees well with that in the literature. The hydrodynamic pressure on a gravity dam face can be reduced by dam flexibility and it decreases with a decreased reflection coefficient of the reservoir bottom.

关 键 词：重力坝 比例边界有限元方法 地震作用 库水可压缩性 动水压力 

分 类 号：TV312[水利工程—水工结构工程]