大型水下盾构隧道结构健康监测系统的构建与应用

水下盾构隧道结构健康监测系统对于指导水下盾构隧道运营期维护管理工作具有重要意义。探讨大型水下盾构隧道结构健康监测系统的组成、监测重点、系统设计要点、数据管理模式等关键问题,并将其应用于南京扬子江隧道结构健康监测系统的构建。基于监测系统几个月的监测数据,分析水下盾构隧道结构随外载环境变化的响应规律。建立基于在线监测数据的隧道运营安全状况的实时模糊综合评价模型,其中采用三标度法确定权重,采用正态分布型函数确定隶属度,最终实现了对南京扬子江隧道结构健康状况的实时评价和预警。研究方法与思路对类似工程具有借鉴意义。

Establishment and application of structural health monitoring system for large shield tunnel

The system of monitoring the structural health of underwater shield tunnel is of great significance to guide the maintenance and management of underwater shield tunnel during the operational period. The key issues of establishing a structural health monitoring system for the large underwater shield tunnel was discussed，including the system compositions，the key monitoring items，the key points of system design and data management modes. It was applied to the construction of the structural health monitoring system for the Yangtze River tunnel in Nanjing. The response of the underwater shield tunnel structure to the external environment was analyzed based on the monitored data with the structural health monitoring system at Nanjing Yangtze River Tunnel for several months. The real-time comprehensive model in terms of fuzzy evaluation for the operation safety of tunnel based on the online monitoring data was established and verified. The model uses the three-scale method to determine the weight and normal distribution function to determine the membership degree，ultimately to realize the function of real-time evaluation and early warning of structural health status of the Nanjing Yangtze River tunnel.