均质及双层地基土条件下环形沟隔振效果分析  

Analysis of vibration isolation effect of ring ditch under homogeneous and double-layer foundation soil

作　　者：刘晶磊 刘鹏泉[1,2,3] 王洋 尚康君 LIU Jinglei;LIU Pengquan;WANG Yang;SHANG Kangjun(Hebei Provincial Key Laboratory of Civil Engineering Diagnosis,Renovation and Disaster Relief,Zhangjiakou 075000,China;Hebei Institute of Civil Engineering,Zhangjiakou 075000,China;Hebei Province Cold Area Transportation Infrastructure Engineering Technology Innovation Center,Zhangjiakou 075000,China)

机构地区：[1]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 [2]河北建筑工程学院,河北张家口075000 [3]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：《世界地震工程》2022年第2期230-238,共9页World Earthquake Engineering

基　　金：2022年度河北省高等学校科学研究重点项目(ZD2022017);校级创新基金项目(XY202110)。

摘　　要：为了探究均质地基和双层土地基条件下环形沟几何参数变化对其隔振区域的影响规律,及环形沟在不同地基土层中隔振效果的差异,本文建立缩尺比为1:15的模型试验,以地基土类型、环形沟深度、宽度及圆心角为研究变量,通过开展具体试验进行探究。结果表明:在均质地基和双层土地基环形沟隔振中,环形沟宽度变化对其隔振效果影响较小,环形沟深度及圆心角是影响其隔振效果的重要参数,且深度和圆心角越大,隔振效果越好,但当地基土为成层土地基,环形沟深在临近土层分界面深度增大时,环形沟隔振效果相对减弱;在均质地基和双层土地基中,相同参数条件下,均质地基土较双层地基土具有更好的隔振特性;振源与环形沟之间及环形沟末端位置区域由于振动波的传播特性存在振动增强区域。In order to explore the influence of the change of the geometric parameters of the annular trench on the vibration isolation area under the conditions of homogeneous and double-layered soil,and the difference in the vibration isolation effect of the annular trench in different foundation soil layers,In this paper,a model test with a scale ratio of 1:15 is established,the type of foundation soil and the annular trench Depth,width,and central angle are research variables,which are explored through specific experiments. The results show that in the ring-shaped trench isolation of homogeneous and double-layer soil foundations,the width of the ring-shaped trench has little effect on its vibration isolation effect. The depth and center angle of the ring-shaped trench are important parameters that affect its vibration isolation effect. The greater the central angle,the better the vibration isolation effect. However,the local foundation soil is a layered soil foundation. When the depth of the annular trench increases as the depth of the adjacent soil layer interface increases,the vibration isolation effect of the annular trench is relatively weakened;In the soil foundation,under the same parameter conditions,homogeneous soil has better vibration isolation characteristics than double-layer soil;there are vibration-enhanced areas between the vibration source and the annular ditch and at the end of the annular ditch due to the propagation characteristics of vibration waves.

关 键 词：地基土层 环形沟 隔振效果 几何参数 

分 类 号：TU435[建筑科学—岩土工程]