在役桥梁基桩质量桩侧-土体弹性波传递特征分析  

Analysis on Characteristics of Elastic Wave Transfer Between Pile Side and Soil Mass of Bridge Foundation in Service

作　　者：郑妍 惠冰 秦祖品 王振军 薛凤蕊 王鲁鑫 ZHENG Yan;HUI Bing;QIN Zupin;WANG Zhenjun;XUE Fengrui;WANG Luxin(Heze Transportation Management Center,Shandong High-Speed Co.,Ltd.,Heze Shandong 274000,China;Shandong Transportation Institute,Jinan Shangdong 250031,China)

机构地区：[1]山东高速股份有限公司菏泽运管中心,山东菏泽274000 [2]山东省交通科学研究院,山东济南250031

出　　处：《工程质量》2023年第S01期134-138,共5页Construction Quality

基　　金：山东省交通运输厅科技计划项目(2021B40)。

摘　　要：基桩作为在役桥梁主要承载构件,在质量安全方面发挥着重要作用。本文依托工程实例,分析了在役桥梁基桩质量检测技术,采用阻抗原理对损伤与缺陷的反射影像,揭示下行波与上行波作用下基桩病害的赋存特征。构建在役桥梁基桩桩侧-土体三维数学模型,研究弹性波在自由边界与土体界面的逸散特性。研究结果表明:桩身与土体密实性直接导致激发冲击弹性波能量向周边土体的逸散速度,且弹性波沿着基桩向下传播过程中,存在能量的衰减及向周围土体逸散的双重效应。在役桥梁基桩质量检测取得了良好的应用效果,为类似工程项目提供技术指导和借鉴意义。As the main bearing member of bridge in service,foundation pile plays an important role in quality and safety.Based on the engineering example,the quality detection technology of foundation pile of bridge in service is analyzed,and the reflected image of damage and defect based on impedance principle is used to reveal the occurrence characteristics of foundation pile diseases under the action of descending wave and ascending wave.In this paper,a three-dimensional mathematical model of pile side-soil of bridge foundation in service is established to study the elastic wave's escape characteristics at the interface between free boundary and soil.The results show that the density of pile and soil directly leads to the dispersion velocity of the excited elastic wave energy to the surrounding soil,and there is a double effect of energy attenuation and dispersion to the surrounding soil when the elastic wave propagates down the foundation pile.The quality inspection of bridge foundation piles in service has achieved good application effect,which provides technical guidance and reference for similar engineering projects.

关 键 词：在役桥梁 基桩质量 桩侧-土体 弹性波 逸散特性 

分 类 号：U416.1[交通运输工程—道路与铁道工程]