土体性质对地铁振动传播与衰减的影响  

Influence of Soil Properties on Subway Vibration Propagation and Attenuation

作　　者：黄浩 陈启阳[1,2] 孔凡兵 庞玲[4] 赵坪锐[1,2] HUANG Hao;CEHN Qiyang;KONG Fanbing;PANG Ling;ZHAO Pingrui(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of High-Speed Railway Engineering,State Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;China Railway First Survey and Design Institute Group Co.,Ltd.,Xi′an 710043,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]西南交通大学高速铁路线路工程教育部重点实验室,成都610031 [3]中铁第一勘察设计院集团有限公司,西安710043 [4]中铁二院工程集团有限责任公司,成都610031

出　　处：《噪声与振动控制》2024年第5期210-217,共8页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(52278459);中铁一院科研资助项目(院科20-17);中铁二院科学技术研究计划资助项目[KYY2019138(19-20)]。

摘　　要：地铁沿线地质构造复杂多变,车致振动在不同路基土中的传播衰减规律也因土体性质的不同而变化。为研究土体性质对车致振动在土体水平和建筑物竖直方向上传播和衰减规律的影响,分别建立车辆-轨道耦合动力学模型和轨道-隧道-土体-建筑物三维动力学有限元模型,然后分别取路基土为坚硬土、中硬土、中软土和软弱土,分析比较地铁运行所引起的线路周围土体和建筑物的振动情况。结果表明:相比较于硬土,软土路基的土体振动强度更大;路基土越软,振动在由土体传到建筑物过程中的衰减幅度越大;随着与线路中心距离的增加,4种土体振动响应在整体上均呈现出随之减弱的趋势,但在局部区域会出现振动放大效应,此现象需格外关注;随楼层升高,在4种路基土条件下建筑物对16Hz以下的振动响应基本不变,对16Hz以上的振动响应呈减弱趋势。研究成果可为不同路基土条件下地铁线路的减振降噪提供理论指导。The geological structure along the subway line is complex and changeable,and the propagation and attenua-tion law of vehicle-induced vibration in different subgrade soils also changes due to the different properties of the soil.In or-der to investigate the influence of soil properties on the propagation and attenuation of the vehicle-induced vibration in hori-zontal direction of soil and vertical direction of buildings,the coupling dynamic model of vehicle-track and the 3D finite ele-ment dynamic model of track-tunnel-soil-building are respectively established.The vibration of the buildings and soil around the line caused by subway operation,is analyzed and compared respectively when the subgrade is made up of hard soil,me-dium hard soil,medium soft soil,or soft soil.The results show that compared with hard soil,the subgrade vibration intensity of the soft soil is greater;the softer the subgrade soil,the greater the vibration attenuation in the transferring process from the soil to the building.With the increase of distance from the line center,the vibration responses of the four kinds of soil display an overall weakening trend,but the vibration amplification effect will appear in local areas.It is necessary to pay special at-tention to this phenomenon.With the rise of the floor,the vibration responses of the buildings on the four kinds of subgrade soil to the vibration below 16 Hz basically don′t change,and the vibration responses to the vibration above 16 Hz show a weakening trend.The research results may provide a theoretical guidance for the vibration and noise reduction of subway lines under different subgrade soil conditions.

关 键 词：振动与波 地铁 振动传播 数值计算 环境振动 土体性质 车致振动 

分 类 号：U491.93[交通运输工程—交通运输规划与管理]