摘要
为探究高速铁路地震区域刚性面板加筋土挡墙的服役性能,结合振动台试验和数值仿真,研究了地震作用下面板水平位移和表层沉降的响应特征,揭示了该结构的变形特性。研究结果表明:不考虑地基变形的影响,地震作用下面板以转动变形为主,震后永久水平位移呈上大下小的趋势;挡墙表层沉降呈双峰分布形式,在连接件末端和筋材末端附近处出现差异沉降,破坏始于筋材末端附近;采用面板水平位移和挡墙表层沉降之间关系,将加筋土挡墙变形划分为4个阶段,综合判断结构的服役性能;采用高速铁路工后沉降限值作为控制指标提出了加筋土挡墙位移指数DI的确定方法;以数值模拟工况为例,确定了上部为无砟轨道结构时加筋土挡墙面板DI阈值为0.3%,上部为有砟轨道且设计速度V≥300 km/h时,面板DI阈值为1.5%。研究成果可为高速铁路加筋土挡墙设计提供参考和依据,同时还可丰富加筋土挡墙抗震防灾理论。
To investigate the service performance of reinforced soil retaining wall with rigid facing in high-speed railway seismic zones,the response characteristics of facing horizontal displacement and surface settlement under seismic action were studied through vibration table tests and numerical simulations,revealing the deformation characteristics of the structure.The findings suggest that regardless of the influence of foundation deformation,rotational deformation occurs in the most parts of the facing,the permanent horizontal displacement after the earthquake shows the trend of large upward and small downward.The surface settlement of the retaining wall exhibits a bimodal distribution pattern,where differential settlement is observed near the ends of connectors and reinforcement bars,and failure initiated near the end of the reinforcement bars.The deformation of the reinforced soil retaining wall is divided into four stages to comprehensively assess the service performance of the structure by using the relationship between the horizontal displacement of the panel and the settlement of the retaining wall surface.Taking the post-construction settlement limit of high-speed railways as a control indicator,a method for determining the displacement index DI of reinforced earth retaining wall is proposed.For the case study presented in this paper,the DI threshold is determined to be 0.3%when the upper part of the reinforced earth retaining wall is a ballastless track structure,and 1.5%when the superstructure is a ballasted track with a design speed of V≥300 km/h.The findings can not only provide references and basis for the design of reinforced soil retaining walls in high-speed railway applications,but also contribute to enriching the seismic disaster prevention theory of reinforced soil retaining walls.
作者
潘申鑫
蒋关鲁
袁胜洋
刘先峰
何梓雷
曹丽君
周诗广
PAN Shen-xin;JIANG Guan-lu;YUAN Sheng-yang;LIU Xian-feng;HE Zi-lei;CAO Li-jun;ZHOU Shi-guang(Key Laboratory of High-Speed Railway Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;China Railway Society,Beijing 100844,China)
出处
《岩土力学》
北大核心
2025年第S1期519-530,共12页
Rock and Soil Mechanics
基金
国家重点研发计划项目(No.2022YFE0104600)
国家自然科学基金(No.52378463,No.52478475)
关键词
服役性能
加筋土挡墙
刚性面板
沉降
位移指数
高速铁路
service performance
reinforced soil retaining wall
rigid facing
settlement
displacement index
high speed railway
