秦沈客运专线路桥(涵)过渡段路基的动力特性分析

Research on dynamic performance of bridge(culvert)-subgrade transition section on Qin-Shen High-speed Railway

基于离散的Fourier变换原理,对过渡段基床振动加速度进行频域分析,获取了基床表层的振动加速度幅值谱、功率谱、相位谱以及线路不同横断面的基床表层振动第一主频值随速度变化规律;通过对过渡段路基不同工况下动态响应的原位测试,分析了路桥(涵)过渡段线路纵向的动态响应以及车速、轴重与动态响应之间的关系和动应力沿路从深度方向的变化规律等。上述这些数据分析结果,为高速铁路过渡段的设计与施工提供了重要参考。

Based on discrete Fourier transform theory and the time domain and frequency domain analysis on a great deal of field test data of the bridge（culvert）subgrade transition section on Qin-Shen High-speed Railway, vibrtion acceleration amplitude spectrum and power spectrum and phase spectrum of the top surface layer of the subgrade, and the relationship between vibration first frequency of the top surface layer of the subgrade and vehicle velocity are acquired. The dynamic responses of subgrade-bridge transition section under high-speed train action are tested in Qin-Shen Railway. The longitudinal distributive regularities of dynamic responses of the transition section, relationships between train speed or axes weight and dynamic stress and variation of dynamic stress with depth are analyzed. The test provides important basis for the design and construction of the transition section roadbed of high-speed railways.