基于合成数据对高铁震源虚拟道集生成方法的验证

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

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。

Based on the principle of superposition method which can eliminate the crosstalk noise of the highspeed 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.