Structural Health Monitoring of Large-Section Tunnel of Jingxiong High-Speed Railway Based on Fiber Bragg Grating Monitoring Technology

Wu Jinghong; Ye Shaomin; Zhang Jiqing; Zhao Qing; Zhang Wenxuan

doi:10.3788/LOP57.210603

Journals >Laser & Optoelectronics Progress >Volume 57 >Issue 21 >Page 210603 > Article

Laser & Optoelectronics Progress
Vol. 57, Issue 21, 210603 (2020)

Structural Health Monitoring of Large-Section Tunnel of Jingxiong High-Speed Railway Based on Fiber Bragg Grating Monitoring Technology

Wu Jinghong^1、2、*, Ye Shaomin³, Zhang Jiqing³, Zhao Qing³, and Zhang Wenxuan²

Author Affiliations

¹苏州科技大学土木工程学院, 江苏苏州, 215011

²苏州南智传感科技有限公司, 江苏苏州 215123

³中国铁路设计集团有限公司, 天津 300000

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DOI: 10.3788/LOP57.210603 Cite this Article Set citation alerts

Wu Jinghong, Ye Shaomin, Zhang Jiqing, Zhao Qing, Zhang Wenxuan. Structural Health Monitoring of Large-Section Tunnel of Jingxiong High-Speed Railway Based on Fiber Bragg Grating Monitoring Technology[J]. Laser & Optoelectronics Progress, 2020, 57(21): 210603 Copy Citation Text

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Sectional circumferential strain monitoring. (a) FBG strain gauge; (b) layout of strain gauges in tunnel section; (c) installation of strain gauge

Fig. 1. Sectional circumferential strain monitoring. (a) FBG strain gauge; (b) layout of strain gauges in tunnel section; (c) installation of strain gauge

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Fig. 2. Structural diagram of FBG displacement meter

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Fig. 3. Monitoring of bidirectional displacement of deformation joints. (a) layout of displacement meter in tunnel section; (b) FBG displacement meter; (c) installation of bidirectional displacement meter

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Fig. 4. Layered settlement monitoring. (a) Layout of layered settlement meter and bedrock mark; (b) FBG static level

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Fig. 5. Layout of sensors for structural health monitoring of Jingxiong high-speed railway tunnel with large section

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Fig. 8. Average strain of 14 measurement points at DK51 + 907 cross section varying with time during filling

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Fig. 9. Internal force changes of 14 measurement points at DK51 + 907 cross section during filling. (a) Axial force; (b) bending moment

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Measurement point	Strain during pouring /με			Measurement point	Strain during pouring /με
Measurement point	Maximum	Average	Minimum	Measurement point	Maximum	Average	Minimum
1	8.7	-13.8	-29.1
2	23.3	-10.1	-27.8	14	6.5	-34.2	51.8
3	-0.6	-30.2	-40.4	13	-0.5	-29.2	-41.7
4	-0.9	-26.9	-34.6	12	0.0	-29.0	-38.2
5	-0.2	-6.5	-9.9	11	-0.1	-7.1	-10.1
6	-0.2	-6.0	-9.0	10	-0.1	-5.0	-6.9
7	5.2	3.2	0.1	9	4.8	3.2	-0.2
8	2.2	-3.3	-6.2

Table 1. Statistics of average strain at each measurement point during pouring

Measurement point	Strain during filling /με			Measurement point	Strain during filling /με
Measurement point	Maximum	Average	Minimum	Measurement point	Maximum	Average	Minimum
1	-7.3	-40.8	-68.8
2	-13.7	-42.4	-68.8	14	-13.6	-39.2	-51.2
3	-1.5	-27.8	-49.8	13	-7.7	-59.9	-90.8
4	0.7	-29.9	-48.6	12	-3.5	-28.9	-48.9
5	-0.5	-23.1	-43.5	11	3.1	-5.6	-24.3
6	-4.2	-21.7	-42.5	10	5.5	-1.2	-12.6
7	5.4	-12.4	-37.7	9	4.7	-7.4	-21.7
8	-4.8	-12.9	-27.1

Table 2. Statistics of average strain at each measurement point during filling

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