摘要
运用有限差分方法分析汶川地震中发生破坏的双级加筋土挡墙破坏机理,并与震害调查结果比较。在此基础上,讨论面板厚度、平台宽度及墙面坡角对双级加筋土挡墙动力响应的影响。计算结果表明:地震作用下各级挡墙绕着基础发生水平转动变形,最大水平变形发生在墙顶,沉降变形主要发生在上级挡墙墙面附近,水平变形和沉降变形随输入地震动的增大而增大;在高烈度地震区(峰值加速度为0.4g),挡墙的水平变形随平台宽度的增大而增大,挡墙的沉降变形随平台宽度的增大而减小,并且改变平台宽度不会改变挡墙的变形特性;与直立挡墙相比,倾斜挡墙的水平变形和沉降变形明显减小。研究结果对高烈度区高大加筋土挡墙的抗震设计有一定的参考价值。
Finite difference method is used to analyze the failure mechanism of two-stage reinforced soil retaining wall in Wenchuan earthquake,and the results are compared with the results of earthquake damage investigation. On the basis of this,the influence of the thickness of the panel,the width of the platform and the slope angle on the dynamic response of the reinforced earth retaining wall is discussed. The calculation shows that,under the action of earthquake,all levels of the retaining wall occur horizontal deformation rotating around the foundation,and the maximum horizontal deformation occurs at the top of the wall,the settlement deformation mainly occurrs in the vicinity of the superior wall,horizontal deformation and settlement deformation increase with the input motion increases;in high intensity seismic region（ peak acceleration 0. 4g）,the level of the retaining wall deformation increases with the increase of the width of the platform increases,the retaining wall settlement decreases with the increase of the width of the platform,and the change the deformation characteristics of platform width does not change the wall; and upright retaining wall,tilt inclined retaining wall deformation and settlement deformation are obviously reduced. The results of the study have a certain reference value for the seismic design of tall reinforced earth retaining wall in high intensity region.
出处
《工程抗震与加固改造》
北大核心
2016年第5期1-8,49,共9页
Earthquake Resistant Engineering and Retrofitting
基金
地震科技星火计划项目(XH14073Y)
河北省高等学校科学研究计划重点项目(ZD2015214)
关键词
双级加筋土挡墙
高烈度地震区
地震反应
抗震设计
FLAC3D
two-stage reinforced soil retaining wall
high seismic intensity region
seismic response
seismic design measures
FLAC3D
