地震动强度分布特征对混凝土面板破坏影响机制研究  

Study on the Impact of the Distribution Characteristics of Seismic Intensity on the Failure Mechanism of Concrete Slabs

作　　者：冯业林 王芳[2] 黄青富 李国英[2] FENG Ye-lin;WANG Fang;HUANG Qing-fu;LI Guo-ying(PowerChina Kunming Engineering Corporation Limited,Kunming 650000,China;Geotechnical Engineering Department,Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]中国电建集团昆明勘测设计研究院有限公司,云南昆明650000 [2]南京水利科学研究院岩土工程研究所,江苏南京210029

出　　处：《水电能源科学》2025年第3期123-127,共5页Water Resources and Power

基　　金：西藏自治区“十四五”时期清洁能源科技重大专项(XZ202201ZD0003G);国家自然科学基金项目(52350393)。

摘　　要：目前,面板堆石坝动力分析中地震动输入极少考虑地震动强度特征对面板动力安全性态的影响。对于土石坝来说,地震动位移及地震引起的塑性永久变形会对大坝防渗体系应力变形产生重要影响,这两者均与地震动强度分布特征密切相关。以拟建240 m高面板坝为例,研究了地震动强度分布特征对面板堆石坝坝体及面板动力响应的影响,分析了坝体塑性变形与面板动应力变化过程之间的联系。研究表明,不同地震动强度分布对面板拉、压应力极值发生时刻具有较大影响。因此,建议面板堆石坝抗震设计中除考虑频谱特性、峰值加速度、地震持时等因素外,还应根据地震场地条件提出合理的地震动强度分布特性,提升面板坝动力分析的可靠性。Presently,seismic input in the dynamic analysis of concrete-faced rockfill dams rarely consider the effect of seismic intensity characteristics on slab's safety.For the rockfill dams,seismic displacements and plastic permanent deformations induced by earthquakes will exert significant influence on the safety state of the dam anti-seepage system,both of which are closely related to the seismic intensity characteristics.Taking the proposed 240 m high concrete-faced rockfill dam as an example,the influence of the seismic intensity distribution characteristics on the dynamic response of dam body and slab is investigated,and the relationship between the plastic deformation and the slab stress is analyzed.The study shows that different seismic intensity distribution has a great influence on the occurrence time of the extreme tensile and compressive stress of the slab.Therefore,this paper suggests that the seismic design of concrete-faced rockfill dams should not only consider the spectral characteristics,peak acceleration and seismic duration time,but also propose reasonable seismic intensity distribution characteristics according to the seismic site conditions,so as to improve the reliability of the dynamic analyses of concrete-faced rockfill dam.

关 键 词：地震动强度 抗震分析 面板堆石坝 面板应力 

分 类 号：TV641.41[水利工程—水利水电工程]