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Technical Brief

Full-Scale Measurement of Micropressure Waves in High-Speed Railway Tunnels

[+] Author and Article Information
Feng Liu

College of Mechanical Engineering,
Taiyuan University of Technology,
Taiyuan 030024, China;
Key Laboratory of Traffic Safety on Track
of Ministry of Education,
Central South University,
Changsha 410075, China
e-mail: lf198187@163.com

Ji-qiang Niu

College of Mechanical Engineering,
Southwest Jiaotong University,
Chengdu 610031, China
e-mail: jiqiang_niu@163.com

Jie Zhang

Key Laboratory of Traffic Safety on Track
of Ministry of Education,
Central South University,
Changsha 410075, China
e-mail: jie_csu@csu.edu.cn

Guo-xing Li

College of Mechanical Engineering,
Taiyuan University of Technology,
Taiyuan 030024, China
e-mail: liguoxing@tyut.edu.cn

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 27, 2017; final manuscript received August 5, 2018; published online September 26, 2018. Assoc. Editor: Satoshi Watanabe.

J. Fluids Eng 141(3), 034501 (Sep 26, 2018) (7 pages) Paper No: FE-17-1697; doi: 10.1115/1.4041111 History: Received October 27, 2017; Revised August 05, 2018

We aim to perform a series of field measurements for high-speed railway tunnels in China to obtain the micropressure wave (MPW) at the tunnel exit and the transient pressures near the tunnel portals. The relationship between the MPW and the nose-entry wave and the effects of train speed and the tunnel exit hole on the MPW are analyzed. The results show that the MPW decreases with increasing distance from the tunnel exit, but increases rapidly with increasing train speeds. Additionally, holes in the hoods near the tunnel exit could decrease the MPW near the tunnel exit by 10–20%.

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References

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Figures

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Fig. 4

Arrangement of measuring points

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Fig. 3

(a) CRH2C EMU and (b) CRH380AL EMU

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Fig. 2

Characteristics of tunnel portals: (a) tunnel A# and (b) tunnel B#

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Fig. 1

Diagram of MPW formation

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Fig. 5

Pressure change of measuring point 140 m from tunnel entrance and wave spread: (a) tunnel A# and (b) tunnel B#

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Fig. 6

Nose-entry wave: (a) pressure and (b) gradient

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Fig. 7

Curves of MPWs 20 m from tunnel exits

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Fig. 8

Curves of MPWs measured at different longitudinal positions: (a) tunnel A# and (b) tunnel B#

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Fig. 9

Amplitudes of MPWs at different longitudinal measuring points: (a) CRH2C and (b) CRH380AL

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Fig. 10

Amplitudes of MPWs with train speed: (a) CRH2C-tunnel A#, (b) CRH2C-tunnel B#, (c) CRH380AL-tunnel A#, and (d) CRH380AL-tunnel B#

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Fig. 11

Comparison of the MPWs when the holes were opened or closed: (a) tunnel A# and (b) tunnel B#

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