关键词: 超前地震预报, 观测系统, 正演模拟, 纵向偏移距, 横向偏移距, 隧道地震

Abstract: Combined with the actual situation of tunnel construction, a new irregular seismic observation system is proposed and used for forward modeling of the weak interlayer in the tunnel’s advance prospecting. The results show that when the number of shots is constant, adding one detector can notably improve the imaging; when the longitudinal offset of the observation system increase, the arc phenomenon in the imaging reduces; when the transversal offset increases, the mirror artifacts in the imaging weakens. The observation system was applied to the Jinyun Mountain tunnel in Chongqing, and the advance prospecting results were in good agreement with the excavation condition, indicating that the system is reasonable and feasible.

Key words: tunnel seismic prediction, observation system, forward modeling, longitudinal offset, transverse offset, tunnel earthquake