列车荷载作用下混凝土排桩主动隔振研究  

Study on Active Vibration Isolation of Concrete Row Piles under Train Loads

作　　者：刘晶磊 刘佳凡[1,2,3] 夏彬 周玮浩 梅名彰 尹姜鳗 LIU Jinglei;LIU Jiafan;XIA Bin;ZHOU Weihao;MEI Mingzhang;YIN Jiangman(School of Civil Engineering,Hebei University of Architecture,Zhangjiakou 075000,Hebei,China;Hebei Key Laboratory of Diagnosis,Reconstruction and Anti-disaster of Civil Engineering,Hebei University of Architecture,Zhangjiakou 075000,Hebei,China;Hebei Innovation Center of Transportation Infrastructure in Cold Region,Hebei University of Architecture,Zhangjiakou 075000,Hebei,China;School of Civil Engineering,Shijiazhuang Railway University,Shijiazhuang 050043,China)

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]河北建筑工程学院河北省土木工程诊断、改造与抗灾实验室,河北张家口075000 [3]河北建筑工程学院河北省寒冷地区交通基础设施工程技术创新中心,河北张家口075000 [4]石家庄铁道大学土木工程学院,石家庄050043

出　　处：《噪声与振动控制》2023年第4期235-242,279,共9页Noise and Vibration Control

基　　金：河北省高等学校科学技术研究资助项目(ZD2022017);河北建筑工程学院研究生创新基金资助项目(XY2023044);河北建筑工程学院研究生创新基金资助项目(XY202203)。

摘　　要：为了研究混凝土排桩作为地基中主动隔振屏障时,桩屏障后地基深处隔振变化规律,运用有限元软件建立轨道-路基-地基三维模型;以振幅降低比作为隔振效果评价指标,将排桩的桩长、埋深及桩间距作为影响地基深处隔振效果的研究变量,分析结果表明:通过增加桩长、减小埋深以及减小桩间距等方式是降低路基边坡处振动的有效措施;随着桩长增加,地基深度方向隔振效果变好,桩长为15 m时,地基深度方向整体隔振效果已较优;埋深变化对地基深度方向隔振效果影响较明显,埋深越大,地基深处隔振效果越差,当埋深为5 m时,深度方向隔振效果已较差,减小埋深是提升深度方向隔振效果的有效措施;随桩间距越大,地基深度方向隔振效果越差,布置桩时,适当减小桩间距有利于降低列车诱发的深度方向的振动。In order to study the variation law of vibration isolation in the deep foundation behind the pile barrier when concrete row piles are used as active vibration isolation barrier in the foundation,a three-dimensional model of tracksubgrade-foundation is established by finite element software.With the amplitude reduction ratio as the evaluation index of vibration isolation effect,the influences of pile length,buried depth and pile spacing of row piles on the vibration isolation effect in the deep foundation are analyzed.The analysis results show that increasing the pile length,decreasing the buried depth and reducing the pile spacing are the effective measures to reduce the vibration at the subgrade slope.With the increase of pile length,the vibration isolation effect in the depth direction of the foundation becomes better.When the pile length is 15 m,the overall vibration isolation effect in the depth direction of the foundation is better.The change of buried depth has obvious influence on the vibration isolation effect in the depth direction of the foundation.The greater the buried depth,the worse the vibration isolation effect in the depth direction.When the buried depth is 5 m,the vibration isolation effect in the depth direction is already poor.Reducing the buried depth is an effective measure to improve the vibration isolation effect in the depth direction.As the pile spacing increases,the vibration isolation effect in the depth direction of foundation becomes worse.When arranging piles,properly reducing the pile spacing is beneficial to reduce the vibration induced by trains in the depth direction.

关 键 词：振动与波 混凝土排桩 主动隔振 地基深处 有限元 隔振效果 

分 类 号：TU311.3[建筑科学—结构工程]