新型铁路沟屏障隔振数值分析

Numerical Analysis of Railway Vibration Isolation of New Style Trenches

建立铁路交通引起的大地及敏感点振动分析模型,该数值计算模型由两部分组成,包括车辆-轨道-路基-大地耦合系统动力分析模型和大地-隔振屏障-建筑物耦合系统动力分析模型,运用大型通用有限元软件ANSYS对新型沟屏障的隔振效果进行分析,新型沟屏障包括梯形、倒梯形、三角型、倒三角形等,并将新型沟屏障的隔振效果和传统型式的沟屏障进行对比分析。结果表明:新型沟屏障的隔振效果优于传统沟屏障,表明可以通过改变沟屏障形状达到增加屏障隔振效果的目的,这是一项有益的探索。

Operation of Beijing-Tianjin inter-city railway indicates that the ＂high-speed era＂ of China＇s railroad started. However, with the increase of the train speed the environmental vibration control along the railways has been becoming a serious problem. Therefore, the project on the ground-borne vibration due to railway traffic is becoming a special concern in civil and environmental engineering. In this paper, the numerical model is set up, which consists of the vehicle-track-roadbed-ground coupling system and the ground-barrier-building coupling system. The universal finite-element software ANSYS is used to analyze the reduction effect of vibration isolation of a new style trench. The style includes trapezoid, up- side-down trapezoid, triangle, up-side-down triangle and so on. The vibration isolation effect of the new style trench is compared with that of the traditional trench. It is shown that the effect of the new style trench is better than that of the traditional trench, and the style of the trench can be properly changed to improve the effect of vibration isolation.