Strain and Cracks of Tunnel Lining Surveyed by Fiber Bragg Grating Strain Sensors and Ultrasonic Tester
The cracks have emerged on the second lining of right tunnel for three months after tunneling in the Xin Chang Tunnel.The maximum crack depth is 264.0 mm which is explored by a RS-ST01C type ultrasonic tester.A fiber Bragg grating strain sensor is developed for measuring the surface strain of second lining.By converting the deflection of structure into the strain of displacement telescopic gauge,a fiber Bragg grating is mounted on two ends of gauge where suffers the strain,and as a result its Bragg wavelength will be shifted.The strain sensitivity and temperature sensitivity of the grating sensor are separately 0.677× 10-6/and 0.968× 10-5/℃.Gratingsensors are installed on the corresponding linings according to the crack distribution.In anobservation period of 51 days,the measurement results indicate that the lining cracks are derivedfrom the tilted pressure of surrounding rock.After a backfill period of 29 days,the tunnel structuresare gradually tending to be stability in the following operation period of 429 days.
Fiber Bragg grating displacement telescopic gauge strain crack ultrasonic single plane method and backfill
Yingna Li Zhilin Zhang Xiaoyong Cao Tao Xie Zhengang Zhao Yaping Zhou Chuan Li Hao Liu Jian kun Su Liming Li
Faculty of Information Engineering and Automation,Faculty of Electric Power Engineering,Kunming Univ Yunnan Aerospace Engineering Geophysical Exploration Co.Ltd,Kunming City 650217, China
国际会议
济南
英文
472-478
2013-05-18（万方平台首次上网日期，不代表论文的发表时间）