Field Test and Numerical Analysis of Dynamic Stress of High-Speed Railway Tunnel Invert in Mudstone
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ORIGINAL PAPER
Field Test and Numerical Analysis of Dynamic Stress of High-Speed Railway Tunnel Invert in Mudstone Mingqing Du
. Jie Su . Xuchun Wang . Zelin Lu
Received: 11 May 2020 / Accepted: 17 August 2020 Ó Springer Nature Switzerland AG 2020
Abstract In order to obtain the dynamic stress of invert and its filling in the high-speed railway tunnel under the vibration load of the train, this paper uses the field measurement method to arrange the resistance strain gauge inside the invert of the Lanzhou–Urumqi high-speed railway Fuchuan tunnel. The dynamic stress of the invert and its filling was measured, and the measurement results were verified by numerical analysis, the results obtained by the two were consistent. The results show that under the action of CRH5 electric multiple units, the dynamic stress time history curve of the invert and its filling has 16 peaks, with V-shape on both sides and W-shape in the middle. When the train load speed is constant, the dynamic stress in the tunnel invert and invert filling decreases with the increase of the depth. The dynamic stress at 0.5 m below the track bed is attenuated by about 23.1% compared to 0.2 m, the dynamic stress at 2.0 m below the track bed is attenuated by 67.5% compared to 0.2 m. Tunnel invert and its filling are the main carriers of train vibration load. The dynamic stress attenuation law of the invert and its filling conforms to M. Du (&) X. Wang Z. Lu School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China e-mail: [email protected] M. Du J. Su Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
the exponential function distribution. Through the data fitting, the calculation formula of the dynamic stress in different depths is given. The research results provide a new method for obtaining the dynamic stress of the invert and its filling in high-speed railway tunnel. Keywords High-speed railway tunnel Invert and its filling Dynamic stress Attenuation law Fitting formula
1 Introduction In recent years, there have been more and more studies on the problems of tunnel structure and ground-borne vibration caused by train operation. A review of researches on ground-borne vibrations due to moving trains in tunnels was presented, introduced the evaluation criteria for ground-borne and the isolation methods for reducing the ground-borne vibrations (Yang and Hsu 2006; Rohit et al. 2017). Experimental validation of a numerical model for the prediction of subway induced vibrations was presented a lot, computed the response of moving loads by first estimating the excitation forces and then solving the track–tunnel–soil interaction problem to compute the vibrations in the tunnel and the free field (Gupta et al. 2009a, b). In recent years the application of 2.5D finite element in tunnel traffic field is increasing gradually,
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Geotech Geol Eng
2.5D finite element and boundary eleme
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