两层泄洪孔口对特高拱坝抗震性能影响研究  

Influence of two-layer flooding orifices on seismic performance of high arch dams

作　　者：熊堃 王维浩 黄红飞 XIONG Kun;WANG Weihao;HUANG Hongfei(Changjiang Survey,Planning,Design and Research Company Limited,Wuhan 430010,China;National Dam Safety Research Center,Wuhan 430010,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010 [2]国家大坝安全工程技术研究中心,湖北武汉430010

出　　处：《中国水利水电科学研究院学报（中英文）》2024年第1期63-72,共10页Journal of China Institute of Water Resources and Hydropower Research

基　　金：国家重点研发计划项目(2017YFC0404906);长江设计院自主创新项目(CX2018Z06)。

摘　　要：我国强震区200 m以上的特高拱坝,在动力响应较为显著的中上部坝体通常布置多层泄洪孔口,有必要就孔口及闸墩结构对拱坝抗震性能的影响进行研究。以金沙江上游旭龙特高拱坝为研究对象,对坝体布置泄洪孔口与不设泄洪孔口两种方案,考虑混凝土的动力损伤效应,从拱坝整体应力及变形、坝体损伤、拱坝极限承载力等方面进行对比分析。研究结果表明,坝身泄洪孔口结构对大坝整体的刚度、强度影响较小,合理的泄洪孔口布置对于拱坝主坝体的抗震安全性能影响有限;但由于闸墩的悬挑、截面变化以及孔口对坝身的削弱作用,闸墩根部与坝体交界处、上游闸墩大梁连接处等位置在强震过程中更容易出现损伤,需开展抗震设计;对于表、中两层泄洪孔口布置拱坝而言,两层孔口之间的坝体部位也是抗震安全的薄弱环节,需采取针对性抗震措施以增强抵御地震破坏的能力。For super high arch dams with a height of over 200m in the strong earthquake zone at home,multi-layer flooding orifices are usually arranged in the middle and upper dam body with significant dynamic response.It is necessary to study the influence of orifices and pier structures on the seismic performance of arch dams.Taking the Xulong super high arch dam on the upper reaches of the Jinsha River as an example and considering the dynamic damage effects of the concrete,the dam’s overall stress and deformation,the damage of dam body,ultimate aseismic bearing capacity and other aspects are compared and analyzed for the dam with or without flooding orifices.The results show that,the flooding orifices have little effect on the overall rigidity and strength of the dam,and the reasonable arrangement of the flooding orifice has a limited impact on the aseismic safety of the arch dam;due to the overhang pier and its section changes and the weakening effect,the junctions between the root of the pier and dam body,the connection of the upstream pier beam are more likely to be damaged during the strong earthquakes,so aseismic design is required.As far as the arch dam with the crest and middle flooding orifice is concerned,the part between the two layers of orifices is also a weak link in seismic safety,and targeted aseismic measures need to be taken to enhance the ability to resist earthquake damage.

关 键 词：特高拱坝 抗震安全性 混凝土损伤 泄洪孔口 旭龙 

分 类 号：TV642.4[水利工程—水利水电工程]