边坡条件对重力式挡墙地震位移模式的影响

发布时间：2018-01-19 23:11

本文关键词： 重力式挡墙边坡条件地震位移模式大型振动台模型试验地震永久位移　出处：《振动.测试与诊断》2017年04期 　论文类型：期刊论文

【摘要】：基于大型振动台模型试验,研究边坡条件对重力式挡墙地震位移模式及其变化方式的影响。振动台模型试验采用2个比尺1∶8的基覆边坡和顺层边坡模型,支挡结构为重力式挡墙与格构式锚杆框架二级组合式结构,地震波选用大瑞人工波和Kobe波。研究表明,基覆边坡中重力式挡墙地震位移模式主要有4类,即绕墙趾向边坡外侧转动、以滑动为主的向边坡外侧滑动与绕墙趾向边坡外侧转动的耦合、以转动为主的绕墙趾向边坡外侧转动与向边坡外侧滑动的耦合以及以滑动为主的向边坡外侧滑动与绕墙踵向边坡方向转动的耦合。顺层边坡中重力式挡墙地震位移模式主要有2类:绕墙趾向边坡外侧转动,绕墙趾向边坡外侧转动与离开边坡土体向外侧滑动的耦合。当地震烈度大于VII度时,重力式挡墙才产生动位移模式。边坡条件、地震波类型及烈度对重力式挡墙地震位移模式及其变化方式的影响较大,对相对位移的影响较小。
[Abstract]:Based on the large-scale shaking table model test, the influence of slope conditions on the seismic displacement model and its variation mode of gravity retaining wall is studied. The shaking table model test adopts two base slope and bedding slope models with a scale of 1: 8. The retaining structure is composed of gravity retaining wall and latticed anchor frame, and the seismic wave is composed of Darey artificial wave and Kobe wave. The study shows that there are four types of gravity retaining wall displacement mode in the foundation slope. That is to say, the coupling between the lateral sliding around the wall toe and the lateral rotation around the wall toe towards the outside side of the slope. The coupling between the lateral rotation of the toe around the wall and the lateral slip of the slope, and the coupling of the lateral sliding towards the slope and the rotation around the heel of the slope. Seismic position of gravity retaining wall in the bedding slope. There are two main types of migration patterns:. Turn around the toe of the wall to the outside of the slope. The coupling between the lateral rotation around the toe of the slope and the lateral sliding away from the soil mass of the slope. When the seismic intensity is greater than the VII degree, the gravity retaining wall will produce the dynamic displacement mode. The type and intensity of seismic wave have great influence on the seismic displacement model and its variation mode of gravity retaining wall, but have little effect on the relative displacement.
【作者单位】：中南林业科技大学现代木结构工程材制造及应用技术湖南省工程实验室;中南林业科技大学土木工程学院;
【基金】：现代木结构工程材制造及应用技术湖南省工程实验室开放基金资助项目(HELFMTS1707) 国家自然科学基金资助项目(51404309,51408617) 湖南省重点学科建设资助项目(2013ZDXK006) 中南林业科技大学引进高层次人才科研启动基金资助项目(104-0094)
【分类号】：TU476.4
【正文快照】： 引言相关研究认为[1-4],挡墙的地震动位移模式及其变化方式影响地震土压力及其分布形式,但到目前为止,有关挡墙地震位移模式的研究还处在探索阶段,相关的文献也较少。一般认为,刚性挡墙的地震位移模式为转动或平移[5-9]。文献[10]认为,挡墙在地震作用下产生3种位移模式:平移、

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