交通车辆引起路基振动特性分析

PROPERTY ANALYSIS OF ROADBED VIBRATION CAUSED BY TRAFFIC VEHICLES

在不影响公路正常运行状态下,实现路基健康的定期检测可保证交通动脉的畅通无阻,预测可能出现的障碍并提前采取措施。作为一种成熟技术,面波法可实现路基的无损探伤,但却受到了交通车辆振动的干扰。该文选取东莞市部分路段进行研究,分析交通车辆产生的路基振动特性。与单震源的锤击振动相比,车辆振动为多震源振动,常常造成噪音伪波速的增大与伪传播方向的混乱。由于面波的波速主要反映波长二分之一深度内地层的物理及力学特性,车辆振动噪音的影响将直接与噪音的伪波速、伪波长(频率)及其对应振幅有关。当噪音频率、幅值与伪波速处于某种组合时,可能对勘测结果影响较大。

In order to make sure for a smooth transportation system,health monitoring of roadbed without affecting the normal running of the road is necessary,so as to take effective measures before problem appears.As a mature technique,the surface wave method could be used as a no demage detection method.However,detection results for roadbed may be affected significantly by traffic vehicles.The properties of roadbed vibration caused by traffic vehicles for two roads in Dongguan are studied in this paper.As the surface wave velocity is related mainly to roadbed properties within a half wavelength deapth,effects of traffic vehicles depend mainly on a psydeuo wave velocity,a psydeuo wave length （frequency） and a related amplititude.Compared to vibrations caused by a homo-source hammer,vibrations caused by traffic vehicles are multi-source,which will cause a psydeuo increase of wave velocity and a psydeuo wave propogation direction.Thus,traffic vehicles may have a significant effect on the results under a certain noise frequency,a psydeuo wave velocity and an amplititude.