The influence of current large-scale subway construction, the limited construction period, and poor management caused by the lack of skilled personnel contribute to the increase in the occurrence of accidents MG132 protocol in subway construction. Thus, the issue of safety has become very serious [1, 2]. Accidents indicate that subway construction affects the ambient environment (ground buildings, transportation, underground structures, underground pipes, etc.), endangers people’s lives, compromises property security, and causes serious economic losses [2]. Several typical subway construction accidents are shown in Table 1. Table 1Several typical subway construction accidents in China.Plenty of new urgent tasks are being proposed because of the serious safety issue in subway engineering.

One of these tasks is to study the safety risk management method. In recent years, the utilization of risk assessment in subway engineering has significantly increased and has provided particular economic benefits and research results [3�C5].The book ��Code for Risk Management of Underground Works in Urban Rail Transit�� [6] published in 2011 provides a reference for the application of risk management in subway engineering and considers the classification standard of probability and consequence. However, in the application process, the risk factors that influence scope, occurrence mechanism, and potential damage mechanism in subway construction are very complex. Risk management involves many disciplines such as natural science, social science, engineering technology, system science, and management science.

Thus, determining if a probability distribution hypothesis is appropriate becomes difficult when tunnel and underground engineering risks are studied with the probability method [7, 8]. Thus, obtaining the ��real�� probability value of an accident is difficult [9]. Kent used the index method to study pipeline accidents. He believes that pipeline accidents cannot be accurately predicted, and risk assessment does not provide an accurate calculation based on the probability theory. Insufficient sample size or calculation quantity is usually regarded as the reason for the inaccurate calculation, but in truth, the main reason is that too many assumptions are made in the computation or collection of samples, which leads to the inaccuracy of the assessment result.

Kent’s method does not consider the ��real�� probability; the indexes in Kent’s method contain the probability and are not tied to the ��real�� probability, which is very persuasive [9].By adopting advanced techniques from the Kent index method and considering the limitation of the application of Kent’s method in subway engineering, a model that can be applied to risk assessment of disastrous accidents in GSK-3 subway engineering is developed in this paper.