水资源与水工程学报2024，Vol.35Issue(4)：127-135,9.DOI:10.11705/j.issn.1672-643X.2024.04.15
近断层地震动组合斜入射下沥青混凝土面板堆石坝响应研究
Seismic response of asphalt concrete face rockfill dam under combined oblique incidence of near-fault ground motions
摘要
Abstract
Water conservancy projects in the western region of China are mostly built near complex earth-quake fault zones,and the pulse-like effect of near-field ground motions on hydraulic structures cannot be ignored.The near-fault ground motion is often composed of P-waves and SV-waves.When the seismic waves reach the surface,they often hit the ground at a certain angle,and the assumption of vertical inci-dence is no longer applicable.Therefore,it is necessary to clarify the impact of combined oblique incidence of near-fault pulse-like ground motions on the seismic response of asphalt concrete face rockfill dams.Based on the surface two-dimensional seismic motion inversion,the oblique incidence time history of P-waves and SV-waves were obtained,and a combined oblique incidence model of near-fault ground motions was con-structed.Five pulse-like and non-pulse-like ground motions were selected to study the influence of the com-bined oblique incidence of near-fault ground motions on the acceleration,stress,and permanent deformation of asphalt concrete panels.The results show that compared to the vertical incidence of ground motions,the horizontal acceleration of the panel increases with the increase of P-wave angle and decreases with the in-crease of SV-wave angle,while the vertical acceleration of the panel and permanent deformation of the dam body are on the opposite;the tensile stress of the panel increases with the increase of P-wave and SV-wave angles;the pulse-like characteristics of near-fault ground motions have a significant amplification effect on the seismic response of the dam,with a maximum increase of 116％in panel tensile stress.关键词
沥青混凝土面板堆石坝/近断层地震动/组合斜入射/脉冲效应/地震响应Key words
asphalt concrete face rockfill dam/near-fault ground motion/combined oblique incidence/pulse-like effect/seismic response分类
建筑与水利引用本文复制引用
许斯年,宋志强,李闯..近断层地震动组合斜入射下沥青混凝土面板堆石坝响应研究[J].水资源与水工程学报,2024,35(4):127-135,9.基金项目
国家自然科学基金重点项目(52039008) （52039008）
陕西省自然科学基础研究计划面上项目(2022JM-276) （2022JM-276）
陕西省教育厅青年创新团队科研计划项目(22JP052) （22JP052）
