Derailment of a train moving on bridge during earthquake considering soil liquefaction

Shen-Haw Ju, S. J. Hung

Research output: Contribution to journalArticle

Abstract

Soil liquefaction may occur due to frequent earthquakes in regions characterized by sandy soil. When liquefaction occurs, the strength of the soil decreases, which may cause trains to derail during earthquakes. This study establishes a three-dimensional two-stage finite element procedure to analyze train derailment behavior during earthquakes under soil liquefaction conditions. In the first stage, a cuboid soil profile is used to simulate the displacement and water pressure fields. Then, the train derailment model using p-y, t-z, and Q-z curves for soil is analyzed, and the displacements obtained from the first stage are added into the p-y, t-z, and Q-z elements to simulate the earthquake motion. The capacities of the p-y, t-z, and Q-z elements are reduced due to excess pore water pressure. Thus, the derailment coefficient of each wheel of the train can be obtained appropriately. Finally, the finite element results indicate that the wheel derailment coefficients with soil liquefaction are greater than those without soil liquefaction for the most of the seismic load time periods.

Original languageEnglish
Pages (from-to)185-192
Number of pages8
JournalSoil Dynamics and Earthquake Engineering
Volume123
DOIs
Publication statusPublished - 2019 Aug 1

Fingerprint

Soil liquefaction
Derailments
earthquakes
liquefaction
train
Earthquakes
Soils
earthquake
wheels
Wheels
soil
soil strength
Liquefaction
sandy soils
soil profiles
Water
water
pressure field
sandy soil
soil profile

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Soil Science

Cite this

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abstract = "Soil liquefaction may occur due to frequent earthquakes in regions characterized by sandy soil. When liquefaction occurs, the strength of the soil decreases, which may cause trains to derail during earthquakes. This study establishes a three-dimensional two-stage finite element procedure to analyze train derailment behavior during earthquakes under soil liquefaction conditions. In the first stage, a cuboid soil profile is used to simulate the displacement and water pressure fields. Then, the train derailment model using p-y, t-z, and Q-z curves for soil is analyzed, and the displacements obtained from the first stage are added into the p-y, t-z, and Q-z elements to simulate the earthquake motion. The capacities of the p-y, t-z, and Q-z elements are reduced due to excess pore water pressure. Thus, the derailment coefficient of each wheel of the train can be obtained appropriately. Finally, the finite element results indicate that the wheel derailment coefficients with soil liquefaction are greater than those without soil liquefaction for the most of the seismic load time periods.",
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Derailment of a train moving on bridge during earthquake considering soil liquefaction. / Ju, Shen-Haw; Hung, S. J.

In: Soil Dynamics and Earthquake Engineering, Vol. 123, 01.08.2019, p. 185-192.

Research output: Contribution to journalArticle

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