不同高度重力坝动水压力分析及Westergaard修正公式研究  

STUDY ON DIFFERENT HEIGHT GRAVITY HYDRODYNAMIC PRESSURE AND WESTERGAARD CORRECTION FORUMLA

作　　者：王铭明[1,2] 陈健云[2] 徐强[2] 范书立[2] 

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500 [2]大连理工大学建设工程学部海岸与近海工程国家重点实验室,辽宁大连116023

出　　处：《工程力学》2013年第12期65-70,84,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(50909015;51009020);国家重点基础研究发展计划(973计划)项目(2013CB035905)

摘　　要：对5种不同高度的重力坝进行了地震作用下坝体-库水系统耦合计算,将所得结果与Westergaard公式解析解相比较发现,两种方法得到的动水压力结果沿坝高度上的分布有很大不同,流固耦合结果在坝面上有上部偏大,下部偏小的趋势;随着坝体高度的增加流固耦合模型的这种趋势越为明显,坝面上出现动水压力最大值的位置也逐渐升高。据此,对Westergaard公式做出修正,考虑到多方面因素对动水压力的影响,对原公式引入了坝体高度修正项、坝体弹性修正项、库底吸收修正项。修正的Westergaard公式解与流固耦合结果及以往文献的试验和计算结果吻合良好。Seismic analysis of gravity dams with five different heights in time domains was performed on the fluid-structure coupling model. Compared to fluid-structure coupling results, Westergaard solutions underestimate the hydrodynamic pressures in the upper part of the dam body, and overestimate in the lower part of the body. The overestimation is more significance with the increase of dam heights. The position where the maximal dynamic water pressure appears in the fluid-structure coupling model increases in height with the increase of the height of dams. On this basis, Westergaard equation was modified taking into account the influence of dam height, elasticity and reservoir bottom condition. The modified Westergaard formula solutions are quite coincident with the results of fluid-structure coupling models and other existing researches.

关 键 词：流固耦合 动水压力 Westergaard公式 水可压缩性 库底吸收系数 

分 类 号：TV312[水利工程—水工结构工程]