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2019 Vol.35, Issue 2

Research Article

Dynamic Behavior Evaluation of Pile-Supported Slab Track System by Centrifuge Model Test

원심모형 실험을 통한 궤도지지말뚝구조의 동적 거동 평가

Mintaek Yoo1
,
Myungjae Lee1
,
Mincheol Baek2
,
Yun-Wook Choo3
,
Il-Wha Lee4*
유 민택1
,
이 명재1
,
백 민철2
,
추 연욱3
,
이 일화4*
1Member, Senior Researcher, Railroad Structure Research Team, Korea Railroad Research Institute
2Engineer, Advanced Test Equipment Build-up Team, Korea Railroad Research Institute
3Member, Associate Prof., Dept. of Civil and Env. Eng., Kongju National Univ.
4Member, Principal Researcher, Advanced Infrastructure Research Team, Korea Railroad Research Institute
1정회원, 철도기술연구원 선임연구원
2비회원, 철도기술연구원 기술원
3정회원, 공주대학교 부교수
4정회원, 철도기술연구원 책임연구원
* Corresponding Author
28 February 2019. pp. 5-17
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Abstract

철도하중 및 지진하중 재하 시 궤도지지말뚝 구조의 동적 거동 평가를 위해 동적원심모형 실험을 수행하였다. 실험의 변수는 연약지반의 깊이와 성토체의 높이로 결정하였으며, 총 4가지 경우에 대해 실험을 수행하였다. 연약지반 깊이는 실제 연약지반층에 고속철도를 부설한 호남고속철도의 익산-정읍 구간의 시추주상도를 분석하여 결정하였으며, 성토체의 높이는 일반적인 고속철도의 성토체 높이 범위의 하한 값과 상한 값으로 결정하였다. 실험 결과, 연약지반 깊이 대비 성토체 높이 비율이 높을 수록 말뚝에 작용하는 최대 휨모멘트 값이 크게 평가되었다. 또한, 실험조건 내에서 부설되는 궤도지지말뚝 구조는 단주기 지진파에 대해서는 국내 내진설계 기준의 최대 지진하중인 0.22g에 대해서까지 안전한 것으로 확인되었다. 그러나, 장주기 지진파에 대해서는 재현주기 2400년 지진인 0.22g로 가진시 말뚝의 균열 모멘트가 초과되었다. 일련의 실험결과를 바탕으로, 본 논문에 기술된 연약지반 깊이와 성토체 높이 범위 내에서 궤도지지말뚝 일반 단면에 대한 연약지반 대비 성토체 높이 비율 기준을 제시하였다.

Dynamic centrifuge model test was conducted to evaluate the dynamic stability of the pile-supported slab track method during dynamic railway loading and earthquake loading. The centrifuge tests were carried out for various condition of embankment height and soft ground depth. Based on test results, we found that the bending moment was increased with embankment height and decreased with soft ground depth. In addition, it was confirmed that the pile-supported slab track system could have dynamic stability for short-period seismic loading. However, in case of long-period seismic loading, such as Hachinohe earthquake, the observed maximum bending moment reached to pile cracking moment at the return period of 2,400 year earthquake. The criterion of ratio between embankment height and soft ground depth was suggested for dynamic stability of pile-supported slab track system.

Keywords
Pile-supported track system
Centrifuge tests
Dynamic behavior
Seismic design code

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 35
  • No :2
  • Pages :5-17
  • Received Date : 2018-06-05
  • Revised Date : 2019-02-25
  • Accepted Date : 2019-02-26
  • DOI :https://doi.org/10.7843/kgs.2019.35.2.5
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