Risk Identification of Shield Tunnel Construction Based on Failure Knowledge

Shield construction is a high-risk construction method for tunnel engineering, there are many uncertain factors. How to identify the risk factors accurately has become a hot topic among scholars. The existing risk identification methods mostly predict risks from the positive direction, it’s inevitable that some risk factors will be omitted, affecting the integrity of the recognition results. This paper introduces the reverse thinking into risk identification, and proposes a new method of risk identification based on failure knowledge. First, turning failure into knowledge based on a threefold arrangement that includes: (1) investigate and collect failure; (2) use the failure knowledge form to describe failure; and (3) extract risk factors from failure by using FCTA approach. Then, adding the unknown risk factors through reverse thinking into the system of known risk factors. Finally, improving the process of risk identification combined with the characteristics of shield tunnel construction.