Abstract: Jiaozhou Bay Subsea Tunnel in Qingdao, crosses many faults, is shallow covered and with large construction risk under complex geological condition. Advance grouting is an important construction technology which can ensure the safe construction. The evaluation of grouting effect and influence factors is analyzed by means of borehole grouting at F44 fault in the construction of Jiaozhou Bay Subsea Tunnel in Qingdao. Key construction steps and optimized construction technologies are proposed, so as to ensure the water-stopping and reinforcing of the grouting section. The rapid and safe construction of Jiaozhou Bay Subsea Tunnel in Qingdao is guaranteed. The paper can provide reference for similar projects in the future.

Key words: grouting effect, evaluation, influencing factor, analysis