山岭隧道洞口震害因素分析与抗震风险模糊综合评价

针对山岭隧道洞口抗震风险的随机性与模糊性特点,提出采用模糊综合评价模型对其进行风险评估.通过统计分析汶川地震中山岭隧道洞口段震害资料,总结影响隧道洞口震害的因素,再遴选出主要因素作为模糊综合评价的影响因子.采用层次分析法和隶属函数分别计算隧道洞口段震害各风险因素的相对权重及各风险因素对风险水平的隶属度,将各相关风险因素的权重与风险因素对风险水平的隶属度进行模糊综合运算,得出隧道洞口抗震风险水平.最后采用模糊综合评价法对实际工程进行抗震风险评估.研究结果可供高烈度地震区隧道洞口抗震设计提供参考.

Factors of seismic damage and fuzzy synthetic evaluation on seismic risk of mountain tunnel portals

In light of the randomness and fuzzy characteristics of seismic risk of mountain tunnel portals,a fuzzy synthetic evaluation model was put up to study it.Through collecting and analyzing information of seismic damage of the tunnel portals,the major factors were summed up and selected as the impact factors of fuzzy synthetic evaluation.In the model,the risk’s weight and the membership degree to the risk level were calculated respectively by the analytic process and trapezoidal membership function.Then the total risk was calculated by fuzzy calculation of the weight and the membership degree.At last,a case was done on in-situ engineering by fuzzy synthetic evaluation.The conclusion can be used as reference for the design of tunnels situated in high-intensity zone.