人民长江2024，Vol.55Issue(7)：189-197,9.DOI:10.16232/j.cnki.1001-4179.2024.07.025
扩大基础和垫座对高拱坝地震动响应的影响研究
Influence of expanded foundation and cushion on ground motion response of high arch dams
摘要
Abstract
Most of the high arch dams in China are located in the southwest region where earthquakes occur frequently and the topographical and geological conditions are complex.Under earthquake action,the dam body is very prone to local cracking and e-ven overall instability.Taking the Baihetan arch dam located in the lower reaches of Jinsha River as the research object,we dis-cussed the influence of expanded foundation and cushion on the seismic responses such as maximum displacement of dam crest and crown cantilever,transverse joints'opening,dam damage volume ratio.The results showed that expanded foundation and cush-ion made the shape of the arch dam more symmetrical,which was beneficial to reducing the displacement response of the dam crest and crown cantilever.At the cost of increasing the transverse joints'opening on both sides,the transverse joints'opening in the middle of the dam body was significantly reduced,and all of the transverse joints' opening tended to be uniform,which was beneficial to give full play to the sealing effect of the waterstop;it can obviously reduce the damage volume ratio of the dam body.The effect of expanded foundation on reducing dam displacement and damage volume ratio is obviously better than the cushion.However,with the increase of ground motion intensity,the restraint capacity of expanded foundation and cushion to displacement response gradually weakens.This paper proves the effectiveness of expanded foundation and cushion in enhancing the seismic ca-pacity of arch dams,which can provide useful reference for similar projects.关键词
地震作用/拱坝/扩大基础/垫座/地震动响应/白鹤滩拱坝Key words
earthquake action/arch dam/expanded foundation/cushion/seismic response/Baihetan arch dam分类
建筑与水利引用本文复制引用
刘晓蓬,张太磊,刘仲秋,陈健云,王铭明..扩大基础和垫座对高拱坝地震动响应的影响研究[J].人民长江,2024,55(7):189-197,9.基金项目
国家自然科学基金项目(52269026,51969010) （52269026,51969010）
