Deformation monitoring at shield tunnel joints: Laboratory test and discrete element simulation

Abstract

Shield tunnel, composed of several segments, is widely used in urban underground engineering. When the tunnel is under load, relative displacement occurs between adjacent segments. In the past, distributed optical fiber sensing technology was used to perform strain monitoring, but there is an urgent need to determine how to transform strain into displacement. In this study, optical frequency domain reflectometry was applied in laboratory tests. Aiming at the shear process and center settlement process of shield tunnel segments, two kinds of quantitative calculation methods were put forward to carry out a quantitative analysis. Meanwhile, the laboratory test process was simulated numerically utilizing the discrete element numerical analysis method. Optical fiber, an atypical geotechnical material, was innovatively applied for discrete element modeling and numerical simulation. The results show that the measured displacement of the dial gauge, the calculated results of the numerical model, and the displacement quantitatively calculated from the optical fiber data agree with each other in general. The latter two methods can potentially be utilized in engineering application of deformation monitoring at shield tunnel joints, but need to be further calibrated and adjusted in detail.

Keywords

discrete element method / distributed optical fiber / MatDEM / OFDR / shield tunnel

References

[1] Bakker KJ, De Boer F, Admiraal JBM, Van Jaarsveld EP. Monitoring pilot projects using bored tunnelling: the Second Heinenoord Tunnel and the Botlek Rail Tunnel. Tunnel Undergr Space Technol. 1999; 14(2): 121-129.

[2] Bo YJ, Wang HN, Jiang MJ, Che N. Particle size effect of tunnel mechanical state in discrete element simulation. Chin J Undergr Space Eng. 2022; 18(5): 1471-1480.

[3] Caratelli A, Meda A, Rinaldi Z, Romualdi P. Structural behaviour of precast tunnel segments in fiber reinforced concrete. Tunnel Undergr Space Technol. 2011; 26(2): 284-291.

[4] Cheng WC, Ni JC. Feasibility study of applying SOFO optical fiber sensor to segment of shield tunnel. Tunnel Undergr Space Technol. 2009; 24(3): 331-349.

[5] Fajkus M, Nedoma J, Mec P, Hrubesova E, Martinek R, Vasinek V. Analysis of the highway tunnels monitoring using an optical fiber implemented into primary lining. J Electr Eng. 2017; 68(5): 364-370.

[6] Gómez J, Casas JR, Villalba S. Structural health monitoring with distributed optical fiber sensors of tunnel lining affected by nearby construction activity. Autom Constr. 2020; 117:103261.

[7] Guan K, Zhu W, Liu X, Wei J. Finite strain analysis of squeezing response in an elastic-brittle-plastic weak rocks considering the influence of axial stress. Tunnel Undergr Space Technol. 2020; 97:103254.

[8] Gue CY, Wilcock M, Alhaddad MM, Elshafie MZEB, Soga K, Mair RJ. The monitoring of an existing cast iron tunnel with distributed fibre optic sensing (DFOS). J Civil Struct Health Monit. 2015; 5: 573-586.

[9] Hashimoto T, Ye G, Nagaya J, Konda T, Ma X. Study on earth pressure acting upon shield tunnel lining in clayey and sandy grounds based on field monitoring. Geotechnical Aspects of Underground Construction in Soft Ground: Proceedings of the 6th International Symposium (IS-Shanghai 2008). CRC Press; 2008: 307.

[10] Huang H, Li Q, Zhang D. Deep learning based image recognition for crack and leakage defects of metro shield tunnel. Tunnel Undergr Space Technol. 2018; 77: 166-176.

[11] Jallow A, Ou CY, Lim A. Three-dimensional numerical study of long-term settlement induced in shield tunneling. Tunnel Undergr Space Technol. 2019; 88: 221-236.

[12] Juárez-Luna G, Tenorio-Montero E. Formulation of a thick beam-column element with embedded discontinues for modelling hinges in simple and double-lined tunnels. Tunnel Undergr Space Technol. 2019; 93:103091.

[13] Katebi H, Rezaei AH, Hajialilue-Bonab M, Tarifard A. Assessment the influence of ground stratification, tunnel and surface buildings specifications on shield tunnel lining loads (by FEM). Tunnel Undergr Space Technol. 2015; 49: 67-78.

[14] Kavvadas MJ. Monitoring ground deformation in tunnelling: current practice in transportation tunnels. Eng Geol. 2005; 79(1-2): 93-113.

[15] Kawakami H. Evaluation of deformation of tunnel structure due to Izu-Oshima-Kinkai earthquake of 1978. Earthquake Eng Struct Dyn. 1984; 12(3): 369-383.

[16] Koyama Y. Present status and technology of shield tunneling method in Japan. Tunnel Undergr Space Technol. 2003; 18(2-3): 145-159.

[17] Lee YJ, Bassett RH. A model test and numerical investigation on the shear deformation patterns of deep wall-soil-tunnel interaction. Can Geotech J. 2006; 43(12): 1306-1323.

[18] Li S, Li P, Zhang M. Analysis of additional stress for a curved shield tunnel. Tunnel Undergr Space Technol. 2021; 107:103675.

[19] Liu C, Pollard DD, Shi B. Analytical solutions and numerical tests of elastic and failure behaviors of close-packed lattice for brittle rocks and crystals. J Geophys Res Solid Earth. 2013; 118(1): 71-82.

[20] Ma GM, Zhou HY, Li YB, et al. High-resolution temperature distribution measurement of GIL spacer based on OFDR and ultraweak FBGs. IEEE Trans Instrum Meas. 2020; 69(6): 3866-3873.

[21] Mohamad H, Soga K, Bennett PJ, Mair RJ, Lim CS. Monitoring twin tunnel interaction using distributed optical fiber strain measurements. J Geotech Geoenviron Eng. 2012; 138(8): 957-967.

[22] Monsberger CM, Lienhart W. Distributed fiber optic shape sensing along shotcrete tunnel linings: methodology, field applications, and monitoring results. J Civil Struct Health Monitor. 2021; 11(2): 337-350.

[23] Moussaei N, Sharifzadeh M, Sahriar K, Khosravi MH. A new classification of failure mechanisms at tunnels in stratified rock masses through physical and numerical modeling. Tunnel Undergr Space Technol. 2019; 91:103017.

[24] Nomoto T, Imamura S, Hagiwara T, Kusakabe O, Fujii N. Shield tunnel construction in centrifuge. J Geotech Geoenviron Eng. 1999; 125(4): 289-300.

[25] Sun H, Liu S, Zhong R, Du L. Cross-section deformation analysis and visualization of shield tunnel based on mobile tunnel monitoring system. Sensors. 2020; 20(4):1006.

[26] Wang J, Liu H, Liu H, Zou Y. Centrifuge model study on the seismic responses of shield tunnel. Tunnel Undergr Space Technol. 2019; 92:103036.

[27] Wang X, Shi B, Wei G, Chen SE, Zhu H, Wang T. Monitoring the behavior of segment joints in a shield tunnel using distributed fiber optic sensors. Struct Control Health Monitor. 2018; 25(1):e2056.

[28] Wei G, Yu G, Hong W. Study on calculation of shield tunnel shearing dislocation platform deformation due to adjacent ground stacked load. J Cent South Univ (Sci Technol). 2018; 49: 1775-1783.

[29] Xiong X, Song G, Chen H, Zhou Q, He Z. Principle and realization method of tunnel deformation detection based on image recognition and data transmission technology. Eng Sci. 2010; 8(4): 23-25.

[30] Zhang X, Broere W. Monitoring seasonal deformation behavior of an immersed tunnel with distributed optical fiber sensors. Measurement. 2023; 219:113268.

[31] Zhao S, Zhang DM, Huang HW. Deep learning-based image instance segmentation for moisture marks of shield tunnel lining. Tunnel Undergr Space Technol. 2020; 95:103156.

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2024 The Authors. Deep Underground Science and Engineering published by John Wiley & Sons Australia, Ltd on behalf of China University of Mining and Technology.