A Study on Settlement Characteristics of Earthwork Subgrade with Lowering the Groundwater in High-speed Railway

Young-Ha Kim; Ki-Young Eum; Sang-Jae Han; Yong-Gul Park; Jae-Hyun Jung

doi:10.7843/kgs.2015.31.5.67

All Issue

2015 Vol.31, Issue 5 Preview Page

A Study on Settlement Characteristics of Earthwork Subgrade with Lowering the Groundwater in High-speed Railway 지하수위 저하에 따른 고속철도 토공노반 침하특성에 관한 연구

31 May 2015. pp. 67-74

PDF XML

Abstract

Unlike the primary consolidation settlement, the settlement of ground water lowering is not considered separately because of relatively small residual settlement. But the allowed residual settlement (30 mm) of the concrete track in the high-speed railway may be exceeded due to unexpected excessive ground water lowering. This study analyzed the effect of the settlement according to the ground water level change using finite element analysis of stress-pore pressure coupling model, and compared the analysis results with the measured data. As a result, the range of elasticity modulus satisfying the allowable settlement was proposed, and it is suggested that settlement due to ground water level changes should be reflected in the design.

Keywords

Groundwater

Elastic modulus

Settlement

High-speed railway

지하수위 하강에 따른 침하량은 1차 압밀 침하량에 비해 비교적 작기 때문에 잔류침하량 산정시 별도로 고려하지 않는다. 그러나 고속철도 콘크리트 궤도에서의 허용잔류침하량은 30mm로 작기 때문에 예기치 못한 과도한 지하수위 하강으로 인하여 허용잔류침하량을 초과할 수 있다. 본 연구에서는 응력-간극수압 유한요소 해석을 통하여 지하수위 변동에 따른 침하 영향을 분석하여 해석결과와 실측자료를 비교하였다. 그 결과 허용잔류침하량을 만족하기 위한 탄성계수 범위를 제시 하였으며 설계 시 지하수위 저하 영향이 반영되는 것이 타당하다고 판단된다.

References

1.Ministry of Land, Infrastructure and Transport, “Railway Design Criterion”, 2011.

2.Lee, M.S., Lee, I.W., and Lee, K.M. (2014), “Embankment Immediate Settlement Analysis of Stress and Pore Pressure by Fluctuations of Ground Water Level”, 2014 Autumn Conference of the Korean Society for Railway, pp.1249-1254.

3.Kerh, T., Hu, Y.G., and Wu, C.H. (2003), “Estimation of Consolidation Settlement Caused by Groundwater Drawdown Using Artificial Neural Networks”, Advances in Engineering Software, Vol.34, No.9, pp. 559-568

4.Choi, C.Y. (2009), “Development of the Integrated Automation Software Development of Railroad Roadbed FEM Analysis & Design”, Railroad track and structure, No.209, pp.41-47.

5.Choi, C.Y., Choi, W.I, Han, S.J., and Jung, J.H. (2013), “Development of Design Method for Reinforced Roadbed”, Railroad track and structure, Journal of the Korean Geotechnical Society Vol.9, No.9, pp.55-69.

6.Choi, C.Y., Mok, Y.J., and Shin, E.C (2008), “A Study of Design Standards and Technology to Estimate Optimum Thickness of Earth Roadbeds”, Korea Railroad Research Institute.

7.Korea rail network authority, “KR CODE 2012”, 2012.

8.Bowles, J.E. (1977), “Foundation Analysis and Design”, 2nd ed., Mcgraw-Hill, New York.

9.DeBeer, E.E. (1965), “Bearing Capacity and Settlement of Shallow Foundations on Sand, Lecture No. 3, Proceedings of the Symposium on Bearing Capacity and Settlement of Foundations, Duke University, pp.15-33.

Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 31
No :5
Pages :67-74
Received Date : 2015-03-12
Revised Date : 2015-04-16
Accepted Date : 2015-04-27
DOI :https://doi.org/10.7843/kgs.2015.31.5.67

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

All Issue