单排桩隔振效果试验研究  

Experimental Study on Vibration Isolation Effect of Single Row Piles

作　　者：刘晶磊 杨烁[1,2,3] 魏宝川 吴浩 赵敏 LIU Jinglei;YANG Shuo;WEI Baochuan;WU Hao;ZHAO Min(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)

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

出　　处：《噪声与振动控制》2022年第4期226-234,共9页Noise and Vibration Control

基　　金：2022年度河北省高等学校科学研究重点资助项目(ZD2022017);河北建筑工程学院研究生创新基金资助项目(XY202104);河北省科技厅重点研发计划资助项目(20373802D)。

摘　　要：为了研究单排桩的桩长、桩径、桩间距以及振源距离等因素在连续型荷载作用下的隔振效果与非单调性,通过室外试验,以连续型荷载作为振源,以地表振幅降低比作为评价指标,对以上影响单排桩隔振效果的因素进行分析。结果表明:增加桩长可以提升隔振效果,当桩长增加1.67倍时,有效隔振区域增大2.29倍。增大桩径可以增加有效隔振区域,桩径增大3倍,有效隔振区域增加2.32倍。增大桩间距会降低隔振效果,当桩间距增大3倍时,桩后区域振幅降低比也随之增大,有效隔振区域的距离变远,并且有效隔振区域变小5.42倍。振源距离的增加也不利于单排桩在连续型荷载作用下的隔振。随着振源距离的增加,振幅降低比Ar值的变化存在着明显的非单调性,当振源距离与10 cm桩径一半的比值为1~7时,Ar达到最大值。当振源距离与10 cm桩径一半的比值为15.6~24.0时,Ar达到最小值,在波谷区范围内存在有效隔振区域。The influence of factors such as pile length,pile diameter,pile spacing and vibration source distance of single row piles on the vibration isolation effect and non-monotonic property under continuous load is studied.Through the outdoor test,with the continuous load as the vibration source and the surface amplitude reduction ratio as the evaluation index,the above-mentioned influencing factors were analyzed.The results show that increasing pile length can enhance the vibration isolation effect.When pile length increases by 1.67 times,the effective vibration isolation area increases by 2.29 times.Increasing pile diameter can increase the effective vibration isolation area,when the pile diameter increases 3 times,the effective vibration isolation area increases 2.32 times.Increasing pile spacing will weaken the vibration isolation effect.When pile spacing increases by 3 times,the amplitude reduction ratio behind pile also increases,and the distance of effective vibration isolation area becomes longer,and the effective vibration isolation area decreases by 5.42 times.Increasing the distance between vibration sources is unfavorable to vibration isolation of single row piles under continuous load.With the increase of the vibration source distance,the variation of the amplitude decrease ratio Ar is obviously non-monotonic.When the ratio of the vibration source distance to half of the 10 cm pile diameter is in the interval of 1-7,the Ar reaches the maximum value.When the ratio of vibration source distance to half of 10 cm pile diameter is 15.6-24.0,the Ar reaches the minimum value.Therefore,there exists an effective vibration isolation range within the trough region.

关 键 词：振动与波 单排桩 室外试验 连续型荷载 非单调性 隔振效果 

分 类 号：TU311.3[建筑科学—结构工程]