| There are substantial cross-cutting uncertainties at tunnel engineering construction activities. And how to comprehensively analyze and evaluate security risk is a serious problem, which has being pursuit to solute for a long time. With the promulgating and implementing of tunnel measurement technology and the corresponding norms, the tunnel works on security issues have been attached great importance at a certain extent. However, existing analysis methods and techniques can not effectively deal with such problems, which still cause security risk problems occurring from time to time at present. Therefore, a further studying of security risk factors and evaluation method in tunnel construction is necessary to improving management and control capability of tunnel security risk.Firstly, security risk factors of tunnel construction were identified according to the feature of substantial uncertainty risk factors existing in tunnel construction project. Then studied the mutual influence relationships between the security risk factors. Using influence diagram theory, set up a icon qualitative model of the risk influence diagram, which can intuitively express the flow of information between risk factors. Then set up the quantitative analysis model of fuzzy influence diagram, through the uncertainty analysis to tunnel security risk factors. Finally, studied the computer algorithms of security risks assessment, and initial set up the system of security risks assessment about tunnel construction, and thus reduced the calculation work for technician. Under the background of BaiHuaShan tunnel project , using the risk assessment model of fuzzy influence diagram, carried out the security risk assessment of the tunnel. The results showed that the method is more scientific and effective.The completion of this thesis is based on Chongqing natural scientific research project, which is"Road Mountain Tunnel Construction Risk Evaluate and System Study of Security Management".
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