返包式加筋土挡墙地震损伤状态评估指标研究  

Study on evaluation indexes of seismic damage state of wrap-faced reinforced soil retaining walls

作　　者：徐洪路 蔡晓光 王海云[1] 李思汉 朱晨 XU Honglu;CAI Xiaoguang;WANG Haiyun;LI Sihan;ZHU Chen(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;China Earthquake Disaster Prevention Center,Beijing 100029,China;Langfang City Key Laboratory of Research and Application of Geosynthetic Reinforced Soil Structure,Sanhe 065201,China;College of Geological Engineering,Institute of Disaster Prevention,Sanhe 065201,China;School of Civil Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,哈尔滨150080 [2]中国地震灾害防御中心,北京100029 [3]廊坊市加筋土结构研发与应用重点实验室,河北三河065201 [4]防灾科技学院地质工程学院,河北三河065201 [5]河北工业大学土木与交通学院,天津300401

出　　处：《振动与冲击》2024年第24期24-33,47,共11页Journal of Vibration and Shock

基　　金：国家自然科学基金联合基金项目(U2139207);地震科技星火项目(XH23067YA);河北省高等学校科学研究计划青年拔尖项目(BJK2024034)。

摘　　要：地震损伤状态评估指标可用于快速评估震后加筋土挡墙服役状态,也可服务于基于位移的抗震设计方法。鉴于目前仍缺乏返包式加筋土挡墙的地震损伤状态评估指标,通过模型振动台试验探讨动力特性变化规律及其与损伤程度之间的关系。结果表明:挡墙的变形模式随动荷载强度的增大而发生变化,当所有工况结束后,最大总残余位移为27.8 mm(2.78%H);结构的动力特性变化规律可以表征结构的损伤状态;随动荷载强度的增大,加筋土体的等效剪切应变从1×10^(-4)增至2×10^(-2),结构所处的状态更加危险。提出了一种基于动力特性和位移指数分布规律来确定加筋土挡墙地震损伤状态指标的方法,通过该方法将返包式加筋土挡墙的地震损伤状态定义为三个等级,并给出了对应的位移指数。The evaluation indexes of seismic damage state can be used to quickly evaluate the performance state of reinforced soil retaining walls after the earthquake,and can also be used for seismic fragility analysis and performancebased seismic design methods.In view of the lack of seismic damage assessment indexes for wrap-faced reinforced soil retaining walls,exploring the variation rule of dynamic properties and its relationship with the damage degree through shaking table tests.The results show that the deformation mode of the wrap-faced reinforced soil retaining walls changes with the increase of dynamic load intensity,and the maximum total residual displacement is 27.8 mm(2.78%H)when all loading conditions were over.The dynamic characteristics of the structure can characterize the damage state of the structure.With the increase of the dynamic load intensity,the equivalent shear strain increases from 1×10^(-4)to 2×10^(-2),and the structure was in an even more dangerous state.Finally,a method for determining the seismic damage assessment indexes of reinforced soil retaining walls based on the distribution law of dynamic characteristics and displacement index was proposed,by which the seismic damage state of wrap-faced reinforced soil retaining walls was defined as three levels and the corresponding displacement index was given.

关 键 词：返包式加筋土挡墙 振动台试验 动力特性 地震损伤状态评估指标 

分 类 号：U417.11[交通运输工程—道路与铁道工程]