振源传导桩隔振系统作用机理与性能  

Vibration Isolation Mechanism and Performance of Excitation Transmission Pile System

作　　者：袁俊[1] 孟昭博[2] 胡卫兵[3] 常玉珍[3] 吴敏哲[3] 

机构地区：[1]西北电力设计院西安,710075 [2]聊城大学建筑工程学院聊城,252059 [3]西安建筑科技大学土木工程学院西安,710055

出　　处：《振动．测试与诊断》2014年第1期57-62,189,共6页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51378245,51248003);陕西省科学技术研究发展计划资助项目(2010K11-05-01);陕西省自然科学基础研究计划资助项目(2011JQ7014);陕西省教育厅专项科研计划资助项目(09JK521);西安市科技计划资助项目(YF07207)

摘　　要：针对目前振动控制措施对轨道交通运营中低频振动的控制效果欠佳的问题,提出一种新型的减振措施——振源传导桩隔振系统。通过分析振源传导桩隔振系统的作用机理和结构布置,建立了振源传导桩隔振系统的数值模型,并以西安地铁二号线钟楼段为例进行参数分析,评价了该系统的减振性能。结果表明,振源传导桩系统具有良好的减振性能。隧道上方地面的振动速度和加速度随传导桩的桩长增加而显著降低。列车运营速度在22.22m/s以下时,车速变化对系统隔振效果影响不大。车速大于22.22m/s时,地面振动响应幅值明显随车速的提高而增大,应适当增加传导桩的桩长。Aiming at the control problem of low-frequency vibration from railway traffic,in which the effectiveness is poor,a theoretically designed innovative countermeasure,named excitation transmission pile system(ETPS),is presented to reduce low-frequency vibration.The mechanism and structure of ETPS are introduced,and its effects are investigated by finite element simulation using the parameters of Bell Tower section of Xi′an metro line 2.The results demonstrate that the ETPS has good performance for vibration isolation.Vibration speed and acceleration of the ground above tunnel obviously are reduced by increasing the pile length of ETPS.When the train speed belows 22.22m/s,the speed change has little effect on the vibration isolation performance of ETPS.When it exceeds 22.22m/s,the greater the train speed,the longer the pile length of ETPS should be for satisfy the vibration limits,because the vibration speed and acceleration of the ground above tunnel increase with the train speed increasing.

关 键 词：轨道 减振 动力响应 低频振动 振源传导桩系统 

分 类 号：X707[环境科学与工程—环境工程] TH702[机械工程—仪器科学与技术]