基于合成数据对高铁震源虚拟道集生成方法的验证

根据稳相点分析的叠加方法原理, 提出一种波形叠加方法, 消除台站记录中高铁波场的串扰噪声, 生成虚拟道集, 并用合成的高铁数据进行验证。通过建立高铁桥梁振动方程, 获得精细的高铁震源时间函数, 然后使用有限元方法,在分层介质模型中进行高速铁路波场正演模拟计算, 并对不同速度的高铁列车正演模拟记录进行时移叠加, 获得虚拟道集, 从而验证叠加方法的正确性。

Validation of the Virtual Gather Generation Method from SyntheticData for High-Speed Rail Seismic Source

Based on the principle of superposition method which can eliminate the crosstalk noise of the high-speed rail seismic wavefield recorded by the stations and generate virtual gathers, the operation ways of the superposition method are given and the method is verified on the synthetic high-speed rail data. The precise source time function of the high-speed rail is obtained by establishing the vibration equation of the high-speed rail viaduct, and the forward modeling of the high-speed rail wavefield in layered medium is calculated by using the finite element method and time-shift superposition of forward modeling of the high-speed rail wavefield with different speeds is carried out. The virtual gathers are obtained, which verifies the correctness of the stacking method.