震后降低水位对滑坡涌浪冲击下震损拱坝损伤的影响  

Influence of Post-Earthquake Water Level Reduction on Arch Dam Damage Subjected to Landslide Surge

作　　者：李玉倩 李静[1] 陈健云[1,2] 徐强[1] LI Yu-qian;LI Jing;CHEN Jian-yun;XU Qiang(Institute of Earthquake Engineering,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学工程抗震研究所,辽宁大连116024 [2]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024

出　　处：《水电能源科学》2025年第2期147-150,154,共5页Water Resources and Power

基　　金：国家自然科学基金项目(52079025);国家自然科学基金重点项目(52192672)。

摘　　要：为探究震后降低水位对滑坡涌浪冲击震损拱坝的影响,数值模拟了某高拱坝在地震作用下的动力响应以及震后降低水位时滑坡涌浪冲击下的动力响应,分别从坝体加权损伤体积比、加权损伤面积比以及坝段加权损伤体积比等方面分析了降低水位对震损拱坝损伤的影响规律。结果表明,震后降低水位的应急措施可以有效地减少滑坡涌浪对拱坝的冲击作用;震后坝前水位越低,震后滑坡涌浪对拱坝造成的损伤越小;震后降低水位对拱坝上游面以及建基面的影响相对较大,不同坝段的加权损伤体积比均随着水位的降低而减小,拱坝左侧坝段的减小程度较大,右侧坝段的减小程度很小。研究结果可为震后提前采取合理的降低水位的应急措施提供参考。To explore the influence of post-seismic water level reduction on the arch dam damage under landslide surge,this study employed numerical simulations focusing on a specific high arch dam.This study investigated the dynamic response of arch dam under seismic excitation and subsequently explored the dynamic response under landslide-generated wave impacts following post-seismic water level reduction.This study examined the influence of water level reduction on arch dam damage,utilizing the dam weighted damage volume ratio,the weighted damage area ratio,and the dam segment weighted damage volume ratio.The results indicate that the emergency measure of post-seismic water level reduction effectively reduces the impact of landslide-generated waves on the arch dam.The lower the water level in front of the dam after the earthquake,the less damage the landslide surge will cause to the arch dam.The decrease in water level after the earthquake has a relatively significant impact on the upstream surface and dam-foundation interface of the arch dam,the weighted damage volume ratios of different dam segments decrease with the reduction in water level,with a greater reduction observed in the left-side dam segment compared to the minimal reduction in the right-side segment.These findings provide valuable insights into adopting appropriate emergency measures of water level reduction after earthquake.

关 键 词：拱坝 地震 滑坡涌浪 坝前水位 损伤 

分 类 号：TV642.4[水利工程—水利水电工程] TV312