库底反射性边界条件与地震动水压力分析  

Reflectional Boundary Condition on Reservoir Bottom and Analysis of Hydrodynamics

作　　者：王忠[1] 晏启祥[1] 刘浩吾[1] 

机构地区：[1]四川大学水电学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2002年第1期35-39,共5页Journal of Sichuan University (Engineering Science Edition)

摘　　要：对目前通常所用的特殊库底反射性条件进行了推广 ,导出了库底存在淤积层时更一般的库底反射系数。利用试点法计算刚性坝面一般库底条件下坝面动水压力与地震干扰频率的关系 ,库底淤积层以及基岩材料性质对动水压力的影响。计算表明 ,考虑库底吸收后严格的库水共振现象不会发生 ,动水压力随淤积层的厚度增大而增大 ,软弱的基层能显著的降低动水压力。推广后的一般库底反射边界条件是有效的 ,可行的。This paper generalizes the special reflection boundary condition which is commonly used at present.More general reflectance coefficient of reservoir base is deduced.Using collocation method and considering rigid dam and generalized bottom condition,the relationship between hydrodynamics and vibration frequency, influence of sediments and the material parameter on hydrodynamic pressure are computed and discussed.It is concluded that resonant vibration will not happen considering the obserbing of reservoir base.The hydrodynamic pressure will increase with the increase of sediment thickness, but the pressure can be remarkablely reduced at soft foundation.

关 键 词：动水压力 刚性坝 可压缩性 反射系数 库底反射性 边界条件 地震 

分 类 号：TV312[水利工程—水工结构工程]