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Discussion papers | Copyright
https://doi.org/10.5194/nhess-2017-412
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 14 Dec 2017

Research article | 14 Dec 2017

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Stability assessment of roadbed affected by ground subsidence adjacent to urban railways

Ki-Young Eum1, Young-Kon Park2, and Sang-Soo Jeon3 Ki-Young Eum et al.
  • 1Advanced infrastructure research team, Korea Railroad Research Institute, Chuldobakmulgwan-Ro 176, Uiwang City, Gyeonggi-Do 16105, South Korea
  • 2Smart station research team, Korea Railroad Research Institute, Chuldobakmulgwan-Ro 176, Uiwang City, Gyeonggi-Do 16105, South Korea
  • 3Department of Civil and Urban Engineering, Inje University, Inje-Ro 197, Gimhae City, Kyungsangnam-Do 50834, South Korea

Abstract. In recent years, leakages in aged pipelines for water and sewage in urban areas have frequently induced ground loss resulting in cavities. One third of the pipelines buried in Seoul city in South Korea are more than fifty years old. Train loadings and change in groundwater levels in the undiscerned development of urban areas induce roadbed settlements. Train derailment may occur as the roadbed exceeds the allowable settlements associated with location and size of the cavity adjacent to the roadbed. In this study, FLAC3D, which is a three-dimensional finite-difference numerical modeling software, is used to do stability and risk level assessment for the roadbed in adjacent to urban railways with respect to various groundwater levels and the geometric characteristics of cavities. Numerical results show that the roadbed settlements in simulated ground conditions in South Korea, that satisfy the allowable values for a cavity of diameter of 10m exists adjacent to the roadbed. The distance between the center of the roadbed and the center of the cavity should be greater than 25m and the groundwater level should be greater than 22m below the ground surface.

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The number of occurrences of ground subsidence induced by a leakage of aged pipelines for water and sewage in urban areas resulting in various sizes of cavity near the urban railway in South Korea has been increased and it may cause the roadbed settlement to exceed the allowable value. In this study, a three-dimensional numerical analysis is carried out to estimate roadbed stability and its risk level associated with various groundwater levels, sizes of cavities in simulated ground conditions.
The number of occurrences of ground subsidence induced by a leakage of aged pipelines for water...
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