Combined migration velocity model-building and its application in tunnel seismic prediction

Abstract

We propose a combined migration velocity analysis and imaging method based on Kirchhoff integral migration and reverse time migration, using the residual curvature analysis and layer stripping strategy to build the velocity model. This method improves the image resolution of Kirchhoff integral migration and reduces the computations of the reverse time migration. It combines the advantages of effi ciency and accuracy of the two migration methods. Its application in tunnel seismic prediction shows good results. Numerical experiments show that the imaging results of reverse time migration are better than the imaging results of Kirchhoff integral migration in many aspects of tunnel prediction. Field data show that this method has effi cient computations and can establish a reasonable velocity model and a high quality imaging section. Combination with geological information can make an accurate prediction of the front of the tunnel geological structure.

Comprehensive geophysical prediction and treatment measures of karst caves in deep buried tunnel

“…TSP203plus is based on propagation and reflection of seismic waves through geotechnical layers (karst caves, karst collapse columns, fault fracture zones and other unfavorable geological conditions) in front of an excavation face (Alimoradi et al, 2008;Gong et al, 2010;Chen et al, 2011).…”

“…In recent years, a great number of tunnels have been constructed, and are currently under construction in karst terrains and mountain areas of Chinese West where large amounts of carbonate rocks exist (Gong et al, 2010). For tunnel construction in karst terrains, the crossing of voids and caverns, either empty, aquiferous or filled with erodible material may induce geohazards and seriously endanger the construction safety (Marinos, 2001;Li et al, 2013).…”

Application of comprehensive prediction method of water inrush hazards induced by unfavourable geological body in high risk karst tunnel: a case study

“…Introduction for advanced geological prediction methods 2.4.1. The tunnel seismic prediction method Tunnel seismic prediction (TSP) is an underground reflection seismic wave technology for advanced geological forecast before the tunnel face (Alimoradi et al 2008;Gong et al 2010). The seismic waves are excited by several (less than 24 generally) small-scale artificial blasting in specific blasting point, received by electronic sensor.…”

Application of Tunnel Seismic Image Approach to the Advanced Geological Prediction for Tunnel

“…The geologic phenomenon is often encountered during the tunnel construction. And these incidents will not only influence the construction of underground engineering projects progress but also bring severe geological disasters, and even cause serious casualties and economic loss [7][8][9]. To ensure construction safety and avoid such accidents, the geological conditions and rock mass in front of working face must be done before the excavation.…”