Influence of Soil Properties on Subway Vibration Propagation and Attenuation
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.
vibration and wavesubwayvibration propagationnumerical calculationenvironmental vibrationsoil propertyvehicle-induced vibration
万方数据
维普
