地震条件下模块式面板加筋土挡墙面板连接稳定性研究  

Analysis of facing connection stability of geosynthetic-reinforced segmental retaining walls under seismic conditions

作　　者：张飞[1] 葛彬 郭志华 舒爽 ZHANG Fei;GE Bin;GUO Zhihua;SHU Shuang(School of Civil Engineering and Transportation,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210098

出　　处：《地震工程与工程振动》2023年第6期167-173,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52078185,52322808);江苏高校“青蓝工程”项目。

摘　　要：地震作用下模块式加筋土挡墙极易发生墙面模块脱落破坏,针对模块面板与筋材的连接稳定问题开展理论分析,用于模块式加筋土挡墙面板连接抗震安全设计。基于极限平衡法,通过考虑筋材与面板间的连接强度和连接抵抗力,提出了地震条件下面板连接稳定性分析方法。运用本文提出的方法进行了一系列参数分析,研究了水平地震力、竖向地震力、加筋间距以及墙趾阻力等因素对面板连接稳定性的影响。研究结果表明:水平和竖向联合地震作用极易导致加筋挡墙面板连接破坏,减小墙趾阻力和增加加筋间距使加筋挡墙面板净连接力减小,且对挡墙下部筋材更加显著。因此,加筋土挡墙抗震安全设计需要注意近断层场地中竖向地震作用,同时加筋间距不宜过大。Geosynthetic-reinforced segmental retaining walls(SRWs)are prone to fail under seismic loading.This study conducts theoretical analyses on the stability of the connection between the facing and the reinforcement,which is used for the seismic safety design of the facing connection of geosynthetic-reinforced SRWs.Based on the limit equilibrium method,the stability analysis method for the facing connection under seismic loading is proposed,considering the required connection strength and the connection resistance between the reinforcement layer and the facing.Parametric studies are conducted to investigate the influence of horizontal seismic force,vertical seismic force,reinforcement spacing and toe resistance on the connection stability of SRW using the proposed method.The obtained results demonstrate that the combined horizontal and vertical seismic actions can easily lead to the connection failure of facing units.The net connection strength of facing decreases with the reduction of toe resistance and the increase of spacing,which becomes more pronounced as the wall height decreases.The seismic design of reinforced segmental retaining walls should pay attention to the vertical seismic effect in the near-fault sites and the reinforcement spacing should not be too large in practice.

关 键 词：模块式面板挡墙 加筋土 地震 极限平衡 连接稳定性 

分 类 号：TU476.4[建筑科学—结构工程]