隧道长期安全监测及评价模型

Monitoring and evaluation model of tunnel long-term safety

分析影响隧道长期安全的结构因素和环境条件因素,并根据有关规范,设计监测方案。根据监测方案建立隧道长期安全评价模型。其中,对于隧道结构,基于单指标安全等级评价建立隧道结构长期安全的多指标综合评价模型,并引入6位5进制数作为隧道结构长期安全状况综合评分,与安全等级评价相结合,更加详实地反映了隧道结构的安全性。对于环境条件,应用层次分析法确定指标权重,梯形分布隶属函数计算指标隶属度,建立隧道运营安全的模糊综合评价模型。最后,将监测方案和评价模型应用于重庆嘉华隧道,取得良好的效果。

This paper conducts a comprehensive analysis on the structural factors and environmental condition factors that influence the long-term safety of the tunnels, and designs a long-term monitoring scheme of tunnels according to relevant norms. The long-term tunnel safety evaluation model based is dcve loped on the tunnel monitoring scheme. For the tunnel structure, this study evaluates the safety ratings with a single index, and develops the multi-index comprehensive evaluation model. As an integrated score, a quinary digit which contains six digits is inducted. Together with the evaluation of safety ratings, it can detailedly reveal the actual safety condition of tunnel structure. As to the tunnel operation, the weight of indexes is confirmed using AHP, and the membership degree of indexes was calculated by trapezoidal distribution membership functions. A fuzzy comprehensive evaluation model of safety is built. This model is applied to evaluate the safety of Jiahua Tunnel, which has achieved a good result.