Study on Risk Assessment of Tunnel Freezing Damage in Cold Region Based on Group Decision
Research purposes:In order to objectively and effectively evaluate the degree of freezing damage of tunnels,a risk assessment model of freezing damage of tunnels in cold regions is established based on group decision-making and triangular fuzzy number method.First,the triangular fuzzy number which is more conducive to the expression of experts is used to establish a judgment matrix.The compatibility index is used to determine the expert judgment level,and then the corresponding weight is given.Second,considering the temperature,hydrology,surrounding rock conditions,engineering measures and other factors that cause freezing damage of tunnels in cold areas,the second-level evaluation index is formed,and the weight of each index is determined by triangular fuzzy number group decision model.Third,the secondary evaluation indexes are divided into 10 quantitative indexes and 6 qualitative indexes,and the membership function is established according to the trapezoidal distribution of the quantitative indexes.The qualitative index is scored by experts according to the percentage system,and then the membership degree of each level is determined according to the trapezoidal distribution function.Last,the grade of tunnel freezing damage is calculated and determined by fuzzy comprehensive evaluation method,and corresponding preventive measures are provided.Research conclusions:(1)Four first-level indexes and 16 second-level indexes of temperature,hydrology,surrounding rock conditions and operation and maintenance measures are selected,and four frost damage grades are set.The comprehensive evaluation system of tunnel frost damage risk in cold regions based on group decision-making based on triangular fuzzy numbers is constructed.(2)The risk assessment model of freezing damage in this paper is applied to the Shahukou Tunnel,and the risk grade assessment is consistent with the actual freezing damage of the tunnel.(3)The model is more objective and comprehensive,and can provide safety early warning and prevention and control suggestions for the risk of tunnel freezing damage.
tunnel in cold regiontriangular fuzzy numbergroup decisionrisk of freezing damagecomprehensive evaluation
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