水平地震作用下公路路基屏障桩减震试验研究  

Experimental research on shock absorbing barrier pile of highway subgrade under earthquake action

作　　者：郁雯[1,2] 胡子良 金颖慧 张文祥 潘乐鹏 YU Wen;HU Ziliang;JIN Yinghui;ZHANG Wenxiang;PAN Lepeng(Hebei University of Architecture,Zhangjiakou,Hebei 075000;Key Laboratory of Civil Engineering Diagnosis,Reconstruction and Disaster Resilience in Hebei Province,Zhangjiakou,Hebei 075000)

机构地区：[1]河北建筑工程学院,河北张家口075000 [2]河北省土木工程诊断、改造与抗灾重点实验室,河北张家口075000

出　　处：《河北建筑工程学院学报》2024年第4期52-58,共7页Journal of Hebei Institute of Architecture and Civil Engineering

基　　金：2024年张家口市科技计划自筹经费项目(2421001A);河北省教育厅科学研究项目资助(ZC2025098)。

摘　　要：为了研究屏障桩的减震效果,现根据设计规范建立缩尺为1∶10的路基模型,通过震动试验的方法,以PGA放大系数作为评价指标,研究在水平地震作用下,桩长和桩间距两变量下路基中各个位置的震动响应情况。结果表明:路基边坡的加速度响应随高程的增加而增大,在路肩处达到峰值,顶部水平面随震源距离的增大而减小;在路基两侧设置混凝土隔桩可以有效减弱地震波在土体中的传播;混凝土桩的间距对减弱地震波在土体中的传播效果十分明显,随着桩间距的增大,路基整体加速度相对值也逐渐增大,随桩间距的增大衰减速率逐渐降低;混凝土桩的桩长对地震波在土体中的传播有明显的抑制作用,随着桩长的增加,减震效果逐渐增加,随桩长的增加衰减速率逐渐降低。In order to study the shock absorption effect of the barrier piles,a subgrade model with a scale of 1:10 is established according to the design specification.Through the vibration test method,the PGA amplification factor is used as the evaluation index to study the pile length and pile spacing under the action of horizontal earthquake.The vibration response of each position in the subgrade under two variables.The results show that the acceleration response of the subgrade slope increases with the increase of the elevation,reaches the peak at the shoulder of the road,and the top horizontal plane decreases with the increase of the distance from the source;Setting concrete spacer piles on both sides of the subgrade can effectively weaken the propagation of seismic waves in the soil;The spacing of concrete piles has a very obvious effect on weakening the propagation of seismic waves in the soil.With the increase of the spacing of the piles,the relative value of the overall acceleration of the roadbed gradually increases,and the attenuation rate gradually decreases with the increase of the spacing of the piles.The pile length of the concrete pile has a significant inhibitory effect on the propagation of seismic waves in the soil.With the increase of the pile length,the shock absorption effect gradually weakens,and the attenuation rate gradually decreases with the increase of the pile length.

关 键 词：公路路基 屏障桩 PGA放大系数 加速度响应 

分 类 号：U213.1[交通运输工程—道路与铁道工程]