不同桩间距对铁路路基的减震效果分析  

Analysis of Damping Effect of Different Pile Spacing on Railway Subgrade

作　　者：张文祥 胡子良 潘乐鹏 郁雯 张宏 樊英 ZHANG Wenxiang;HU Ziliang;PAN Lepeng;YU Wen;ZHANG Hong;FAN Ying(Hebei University of Architecture,Zhangjiakou,Hebei 075000;Zhangjiakou Yanghe River Administration Department,Zhangjiakou,Hebei 075000;Zhangjiakou Qingshui River Administration Department,Zhangjiakou,Hebei 075000)

机构地区：[1]河北建筑工程学院土木工程学院,河北张家口075000 [2]张家口市洋河河务管理处,河北张家口075000 [3]张家口市清水河河务管理处,河北张家口075000

出　　处：《河北建筑工程学院学报》2023年第2期51-54,71,共5页Journal of Hebei Institute of Architecture and Civil Engineering

基　　金：2023年河北省高等学校科学技术研究项目(ZC2023028);2022年张家口市重点研发计划项目(2221007A);2021年河北省高等学校科学技术研究青年基金项目(QN2021218)。

摘　　要：为了研究隔桩路基在地震作用下的动力响应特性,设计并完成了1:10比尺的路堤模型。采用现场试验的方法分析了路堤在设置隔桩情况下的地震响应,在满足相似律的条件下,对比不同桩间距对铁路路基的减震性能。试验结果表明:混凝土隔桩能够有效抑制路基对于地震加速度的响应,对地震波的传播起到良好的阻隔作用;地震加速度沿着路堤的高度单调增加,从坡底处开始沿高度逐渐增大,在路肩处达到最大,后又沿路基表面减小,整体呈现先升高后降低的现象。随着桩间距的减小,路基对于地震动的响应开始呈现减小趋势,存在减小最快区间,最佳的抗震桩间距应根据实际情况进行确定。设置路基隔桩能够有效地阻隔地震波的传播,一定程度上避免铁路发生路基的开裂、变形等震害带来的破坏,从而提高铁路路基的抗震能力。A 1:10 scale embankment model was designed and completed in order to study the dynamic response characteristics of separated pile subgrade under earthquake action.The seismic response of embankment with separate piles is analyzed by field test method,and the damping performance of railway subgrade with different pile spacing is compared under the condition of similarity law.The test results show that concrete isolation pile can effectively suppress the response of subgrade to seismic acceleration and play a good barrier role in seismic wave propagation.The seismic acceleration increases monotonously along the embankment height,from the bottom of the slope gradually increases along the height,reaches the maximum at the shoulder,and then decreases along the subgrade surface,showing an overall phenomenon of first increasing and then decreasing.With the decrease of pile spacing,the response of subgrade to ground motion begins to decrease,and there exists the fastest decreasing range.The optimal seismic pile spacing should be determined according to the actual situation.The isolation pile can effectively block the propagation of seismic waves,to a certain extent,avoid the cracking and deformation of railway roadbed caused by earthquake damage,so as to improve the seismic capacity of railway roadbed.

关 键 词：动力响应 地震 铁路路基 隔震设计 

分 类 号：F530.31[经济管理—产业经济]