###
DOI:
工程科学与技术:2016,48(Z1):39-46
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
对震后沙牌拱坝坝肩动力稳定性的再分析
(四川大学水利水电学院\水力学及山区河流开发与保护国家重点实验室)
Post Earthquake Dynamic Stability Reanalysis of Shapai Arch Dam Abutment
(State Key Laboratory of Hydraulics and Mountain River Development and Protection, College of Water Resources & Hydropower, Sichuan University)
摘要
图/表
参考文献
相似文献
附件
本文已被:浏览 1551次   下载 172
投稿时间:2015-08-18    修订日期:2016-01-13
中文摘要: 沙牌RCC拱坝是少数经受了大地震考验的百米级高坝实例之一,对其坝肩动力稳定性的再研究意义重大。本文综合有限元法与刚体极限平衡法的优势,提出极限累积位移公式作为滑块失稳判据,开展了两种地震波作用下的沙牌坝肩动力稳定分析并对5.12地震反演的人工波开展了拱坝坝肩稳定性超载分析。结果表明,在反映5.12地震的人工波(ah=2.05 m/s2)作用下,沙牌左右坝肩稳定,与实际地震效应一致。在设计波(ah=5.31m/s2)作用下,沙牌左岸坝肩将失稳,而右岸仍稳定。进行人工波超载分析时,左岸坝肩滑块L1、L2分别经受3.2、3.6倍人工超载波时会发生滑移失稳;右岸坝肩滑块则在4.2倍超载波作用下滑移失稳。此次沙牌坝肩动力稳定再分析考虑了滑块滑移方向及安全系数瞬态变化对滑块累积位移的影响,更真实地反映了沙牌拱坝坝肩滑块滑移规律,为工程实际中的坝肩动力稳定分析提供了一个新思路。
Abstract:Shapai RCC dam is a arch dam more than one hundred meters high, and it is one of the few examples withstood the earthquake, so the dynamic stability reanalysis of dam abutment is significant. Combining with the advantages of the finite element method and limit equilibrium method, the limit cumulative displacement formula is put forward and acted as the stability criterion of slider, dynamic stability analysis of Shapai arch dam’s abutment is conducted under two seismic waves and the overload study of Shapai arch dam is conducted under the artificial waves reflecting the 5.12 earthquake. The results show that Shapai arch dam’s abutment is stable under the impact of artificial waves (ah=2.05 m/s2) , which is consistent with the actual seismic effects. However, under the action of design waves(ah=5.31m/s2), the Shapai arch dam’s left bank abutment is unstable, but on the right bank, the abutment keeps stable. When the left bank slider L1、L2 withstand the 3.2、3.6 times artificial wave respectively, the instability happens on the two sliders. The instability happens on the right bank slider when there is a 4.2 times overload. The slip direction and the influence of safety factor changing with time to cumulative displacement are considered. The abutment slider slip rule is reflected more practically and a new way of abutment dynamic stability analysis is provided in practical engineering.
文章编号:201500809     中图分类号:    文献标志码:
基金项目:
作者简介:
引用文本:
吴玉龙,张建海.对震后沙牌拱坝坝肩动力稳定性的再分析[J].工程科学与技术,2016,48(Z1):39-46.
WU Yulong,ZHANG Jianhai.Post Earthquake Dynamic Stability Reanalysis of Shapai Arch Dam Abutment[J].Advanced Engineering Sciences,2016,48(Z1):39-46.