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为了更准确研究高速列车引起的地基振动,提出了车体—轨道系统—饱和土地基耦合分析模型。列车荷载分为两部分:车体轴重和轨道不平顺引起的轮轨动力作用力。车体模拟为一个多刚体系统,并在轮对与轨道之间引入Hertizian线性接触模型来考虑轮轨的动力相互作用。通过车体轮对与轨道接触点位移协调条件,求得轨道不平顺等因素引起的轮轨动力作用力。在忽略土颗粒压缩性与自重的情况下,饱和土体中引入Biot波动理论来描述其动力特性。轨道系统与土体控制方程通过Fourier变换在变换域里进行求解,时域数值结果通过快速Fourier逆变换(IFFT)求得。研究了轮轨激振频率对轮轨动力作用力的影响以及在列车轴重与轮轨动力作用力作用下饱和土体的动力响应,表明轮轨动力作用力对列车荷载引起的周边环境振动有着重要影响,在实际工程中不能忽略。
In order to study the ground vibration caused by high-speed trains more accurately, a vehicle-track system-saturated soil foundation coupling analysis model is proposed. The load of train is divided into two parts: the wheel-rail dynamic force caused by the axle body weight and rail irregularity. The vehicle body is modeled as a multi-rigid body system, and the Hertizian linear contact model is introduced between the wheelset and the orbit to consider the wheel / rail dynamic interaction. The wheel-rail dynamic force caused by factors such as track irregularity and so on is obtained through the coordination of the displacement of the vehicle body wheel and the track contact points. Ignoring the compressibility and weight of soil particles, the Biot wave theory is introduced to describe the dynamic characteristics of saturated soils. The orbital system and soil governing equations are solved in the transform domain by Fourier transform, and the time-domain numerical results are obtained by the fast Fourier inverse transform (IFFT). The effect of wheel-rail excitation frequency on wheel-rail dynamic force and the dynamic response of saturated soil under the influence of train axle load and wheel-rail dynamic force are studied. The results show that the wheel-rail dynamic force has a positive influence on the surrounding environment vibration caused by train load Important impact, can not be ignored in the actual project.