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2016 Vol.32, Issue 6
Transformation of Load Transfer Soil Arch in Geosynthetics-Reinforced Piled Embankment: A Numerical Approach

성토지지말뚝공법의 아치형 응력전달구조 변화에 대한 수치해석적 분석

Taehee Lee1
,
Su-Hyung Lee2
,
Il-Wha Lee3
,
Young-Hoon Jung4*
이 태희1
,
이 수형2
,
이 일화3
,
정 영훈4*
1Graduate Student, Dept. of Civil Eng., Kyung Hee Univ.
2Principal Researcher, Korea Railroad Research Institute
3Principal Researcher, Korea Railroad Research Institute
4Associate Prof., Dept. of Civil Eng., Kyung Hee Univ.
1경희대학교 사회기반시스템공학과 박사과정
2한국철도기술연구원 책임연구원
3한국철도기술연구원 책임연구원
4경희대학교 사회기반시스템공학과 부교수
*교신저자. *Corresponding Author. 
30 June 2016. pp. 5-16
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Abstract

In the geosynthetics-reinforced piled embankment the effects of soft soil stiffness, friction angle of the fill material, tensile stiffness of geosynthetics, and height of the embankment on the load transfer soil arch measured by the critical height were numerically investigated. Results from parametric studies show that the magnitude of the soft soil stiffness is the most influencing factor on the critical height. The contour charts of the critical height with respect to the combination of the soft soil stiffness and other parameters were presented. The charts show that the critical height sensitively varies with the combination of the soft soil stiffness and the height of embankment. Under the sufficiently low stiffness of soft soil, the critical height sensitively varies with the friction angle of the fill material. Once the geosynthetic layer is placed, however, the magnitude of the tensile stiffness of the geosynthetic layer hardly influences the critical height of the soil arch.

Keywords
Piled embankment
Critical height
Soft soil stiffness
Geosynthetics
Soil arching effect

성토지지말뚝공법에서 연약지반 강성, 성토체의 내부마찰각, 토목섬유의 인장강성, 성토고의 변화가 한계높이로 표현되는 하중 전이 흙 아치의 형태에 어떠한 영향을 미치는지 수치해석적으로 분석하였다. 매개변수 해석결과에서 연약지반 강성이 한계높이에 가장 큰 영향을 미쳤다. 주 영향요소인 연약지반 강성과 다른 매개변수의 조합에 대해 한계높이가 어떻게 변화하는지 등고선도 형태의 도표를 제시하고 분석하였다. 해석 결과는 연약지반 강성과 성토고의 조합에 대해 한계높이가 매우 민감하게 변함을 보였다. 연약지반 강성이 충분히 낮은 조건에서 성토체의 내부마찰각에 대해 한계높이가 민감하게 변하였다. 토목섬유가 포설된 조건에서는 토목섬유 인장강성의 변화가 한계높이 변화에 큰 영향을 주지 않았다.

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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 : 32
  • No :6
  • Pages :5-16
  • Received Date : 2016-03-22
  • Revised Date : 2016-05-17
  • Accepted Date : 2016-05-24
  • DOI :https://doi.org/10.7843/kgs.2016.32.6.5
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