隧道超前地质预报多源地震干涉法成像结果影响因素研究

On Influencing Factors of the Tunnel Geological Prediction Results Obtained by Multi-source Seismic Interferometry

  • 摘要: 多源地震干涉技术是近年来在地球物理领域新发展的一种探测方法。在隧道超前地质预报中,由于该方法能够直接利用爆破开挖或TBM滚刀破岩所产生的地震波对前方地质情况进行预测,既不影响隧道施工,又降低预报成本,因此具有广泛的应用前景。但由于实际震源的复杂性以及隧道施工环境对数据采集质量的影响,增加了地质预报成像的难度。文章基于数值模拟手段,对该方法在TBM施工及钻爆法施工环境下的理论效果进行了模拟,在此基础上主要对采集时长、震源激发延迟时间、震源点及接收点的位置分布等因素对成像结果的影响进行了研究。模拟分析结果能够为该方法的实际应用起到指导作用。

     

    Abstract: Multi-source seismic interferometry is a newly developed geophysical prediction method in recent years. The future of this method is promising in the field of tunnel geological prediction since it can directly use seismic waves excited by blasting excavation and TBM cutters to predict the geological conditions in front of tunnel face,the construction won′t be affected and the prediction cost decrease thereof. However it is more difficult for the imaging of geological prediction due to the complexity of actual seismic source and tunnel construction environment. By means of numerical simulation, the theoretical results of multi-source seismic interferometry method for tunnel geological prediction were simulated in condition of TBM and drill-and-blast construction, and the effects of acquisition time, source excitation delay time, distribution of seismic source and receiving points on imaging results were studied.

     

/

返回文章
返回