摘要
基于比例边界有限单元法和连分式渐近展开构建的层状地基高阶双渐近透射边界具有全频范围内快速收敛的高阶精度和很高的计算效率,将高阶双渐近透射边界与近场有限元方程相结合,并将隧洞内水体视为理想声学流体以考虑动水压力作用,进行了输水隧洞-层状地基-动水系统的地震响应分析。数值算例分析结果表明:在地震作用下隧洞内壁的附加动水压力数值较大,其影响不容忽略,考虑动水压力后,隧洞结构的加速度和位移响应略微有所增大,表明动水压力对结构的加速度和位移响应影响较为有限;第一主应力和第三主应力数值有较大幅度增加,隧洞内衬混凝土损伤数值和损伤开裂区域较无内水工况对应的数值大。因此,在输水隧洞的地震响应分析和抗震设计中,十分有必要考虑附加动水压力的影响。
The high-order doubly asymptotic transmitting boundary of stratified foundation constructed based on the scaled boundary finite element method and continued fraction asymptotic expansion has high order accuracy and high computational efficiency of fast convergence in full frequency range, thus combining the high-order doubly asymptotic transmitting boundary with the near-field finite element equation and taking the water body inside tunnel as an ideal acoustic fluid to consider the effect of hydrodynamic pressure, a seismic response analysis on the water conveyance tunnel-stratified foundation-hydrodynamic system is carried out herein. The analysis result from the relevant numerical calculation case shows that the additional hydrodynamic pressure on the inner wall of the tunnel is larger under seismic effect and its influence cannot be ignored, while both the acceleration and the displacement responses of the tunnel structure increase slightly, which indicates that the influence of the dynamic pressure on acceleration and displacement responses of the structure is relatively limited. The values of the first principal stress and the third principal stress increase greatly, while the damage value and the damage cracking area of the tunnel lining concrete are larger than those corresponding values under the condition without internal water. Therefore, it is quite necessary to consider the additional dynamic pressure during the seismic response analysis and seismic design of water conveyance tunnel concerned.
作者
周耀强
石文广
唐欣薇
杨轩
ZHOU Yaoqiang;SHI Wenguang;TANG Xinwei;YANG Xuan(Guangdong Yuehai Pearl River Delta Water Supply Co.,Ltd.,Guangzhou 511458,Guangdong,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China)
出处
《水利水电技术（中英文）》
北大核心
2022年第8期101-111,共11页
Water Resources and Hydropower Engineering
基金
广东省重点领域研发计划项目(2019B111108001)。
关键词
输水隧洞
地震响应
层状地基
动水压力
比例边界有限单元法
透射边界
water conveyance tunnel
seismic response
stratified foundation
hydrodynamic pressure
scaled boundary finite element method
transmitting boundary
