| Compared with other projects, Tunneling, Underground projects invests greatly and has confidentiality, complexity, uncertainty and so on prominent characteristics, then the risk of the investment is very high and regardless of being the design, the construction or the decision-making can encounter many difficulties and the barrier, even significant engineering accidents emerge in endlessly. So, the need to control the engineering risk is required.The author carries out the study on nonlinear fuzzy judgment method for Risk assessment of the tunnel construction in NAT. First, the basic principle of risk theory are comprehensive discussed, and the elementary theory of fuzzy synthesis judgment method is introduced with emphasis. Next, because of the deficiency of existed fuzzy classification methods for risk assessment of the tunnel, the author carry out some reach work to improve it:aiming at engineering application, determine the chief factor affecting the stability of tunnel after comprehensive and in-depth analyzing on it, the framework of risk analysis and assessment during the construction of tunnel in NTA was established, afterwards, basing on the consideration about the hierarchy and the illegibility of the influence factors influencing the risk of tunnel stability and aiming at localization and deficiency of existed fuzzy judgment methods for the risk assessment on tunnel construction, determine the priority in the method of fuzzy analytical hierarchy process, and emphasizing the study on the nonlinear characteristic of fuzzy matrix weighting operation, establish nonlinear fuzzy judgment method of risk assessment on tunnel construction through the introduction of nonlinear fuzzy matrix composition operator, then the risk assessment of tunnel stability will become more reasonable and practical. Last, through the computation results of practical engineering and its comparison with those of other classification methods show that it is reliable and reasonable. |
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