返包式加筋土挡墙地震损伤状态评估指标研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (24) : 24-33.

论文

返包式加筋土挡墙地震损伤状态评估指标研究

徐洪路1，蔡晓光2,3，王海云1，李思汉3,4，朱晨5

作者信息 +

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

XU Honglu1，CAI Xiaoguang2,3，WANG Haiyun1，LI Sihan3,4，ZHU Chen5

Author information +

文章历史 +

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27.8mm（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。最终，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。

Abstract

The evaluation indexes of seismic damage state can be used to quickly evaluate the performance state of reinforced soil retaining walls (RSRWs) after the earthquake, and can also be used for seismic fragility analysis and performance-based seismic design methods. In view of the lack of seismic damage assessment indexes for wrap-faced RSRWs, 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 RSRWs 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 RSRWs based on the distribution law of dynamic characteristics and displacement index was proposed, by which the seismic damage state of wrap-faced RSRWs was defined as three levels and the corresponding displacement index iwas given.

导出引用

徐洪路1, 蔡晓光2, 3, 王海云1, 李思汉3, 4, 朱晨5. 返包式加筋土挡墙地震损伤状态评估指标研究[J]. 振动与冲击, 2024, 43(24): 24-33

XU Honglu1, CAI Xiaoguang2, 3, WANG Haiyun1, LI Sihan3, 4, ZHU Chen5. Study on evaluation indexes of seismic damage state of wrap-faced reinforced soil retaining walls[J]. Journal of Vibration and Shock, 2024, 43(24): 24-33

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