METHOD FOR TUNNEL LIFE-CYCLE HEATH MONITORING BASED ON DISTRIBUTED OPTICAL FIBER SENSOR
An increasing number of tunnel diseases have been appearing due to operating age,geologic changes,material degradation,etc. The deterioration of secondary lining such as concrete cracking and leaking are the most important diseases. At present,the detection of diseases mainly depends on ground penetrating radar,seismic wave method,CT and other techniques which are difficult to monitor the process of degradation and to predict diseases. The Brilliouin optical time domain analysis (BOTDA) is a new technique used to measure and monitor the strain and the temperature along the long-distance optical fiber. As the characteristics of distributed measurement,long distance,high precision and durability,BOTDA is particularly interesting for the life-cycle health monitoring of tunnel. In this paper,2.5km distributed optical fiber are embedded into concrete of secondary lining by air-blowing and vacuum grouting technique. The experiments are carried out to calibrate the strain measuring accuracy of the embedded optical fiber sensor. The health state of tunnel during construction is established by the data of traditional sensor,and the long-term health monitoring is carried out by strain measured by distributed optical fiber. At last,the health monitoring software owns the function of diseases visual query and real-time data analysis has been introduced.
Tunnel engineering Health monitoring Distributed optical fiber BOTDA
Jiang-Hong Mao Yong He Wei-Liang Jin
Institute of Structural Engineering,Zhejiang University,Hangzhou 310058,P.R.China
国际会议
The Eleventh International Symposium on Structural Engineering(第十一届结构工程国际研讨会)
广州
英文
1064-1069
2010-12-01（万方平台首次上网日期，不代表论文的发表时间）