论文部分内容阅读
基于层状梁和粘弹性半空间体理论建立轨道路基耦合动力分析模型;通过移动坐标和Fourier变换得到移动谐振点荷载作用下轨道路基稳态响应在波数域内的解;再利用快速Fourier逆变换,求出钢轨、轨枕位移及道碴路基的相互作用力在空间域内解。通过算例分析荷载速度对路基表面位移的影响,结果表明:随荷载速度增大,路基表面位移峰值也增大,在荷载速度较低范围内,其对路基位移峰值影响不大,当荷载速度接近Rayleigh波速时,路基位移峰值急剧增大;随着荷载速度的增大,路基竖向位移分布呈现出的“波动性”也越来越明显,其“波长”随荷载速度的增大而减小。
Based on the layered beam and viscoelastic half-space theory, the dynamic model of rail-subgrade coupling is established. The moving coordinates and Fourier transform are used to obtain the solution of the steady-state response of the subgrade in wavenumber domain under the moving resonance point load. Find the rail, sleeper displacement and ballast subgrade interaction in the spatial domain solution. The results show that the peak value of surface displacement also increases with the increase of load velocity, and it has little effect on the peak value of subgrade displacement when the load velocity is low. When the load velocity When Rayleigh wave velocity is approaching, the peak value of subgrade displacement sharply increases. With the increase of load velocity, the “fluctuation” of vertical displacement distribution of subgrade is more and more obvious, and its “wavelength” decreases with the increase of load velocity small.