Abstract:

The geological condition of the Qingdao Jiaozhouwan subsea tunnel is very complex for having plenty of high inclination-angle faults. The key point of the engineering construction is the safety when passing a watery faulu under the sea. As a mature means of advanced geology predication applied to tunnel in recent years, the TSP advance geological forecast system has advantages, such as long forecast distance, sensitivity to faults, easy of use and less affected  construction. The TSP advanced geological forecast system was used to detect the f2-1 watery fault of the Jiaozhouwan subsea tunnel. The pictures of depth migration, reflector extraction, 2D figure of result and 3D figure of result were obtained, and finally the scale and location of the f2-1 fault were determined. The obtained data about quantity and length of the fault could provide parameters for pre-grouting. The geological record of this section proved the accuracy and effectiveness of this prediction.

Key words: advanced geological prediction; watery fault; geological record