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2015 Vol.31, Issue 4 Preview Page
Numerical Analysis on the Effect of Increasing Stiffness of Geosynthetics on Soil Displacement and Pile Efficiency in Piled Embankment on Soft Soil

성토지지말뚝구조에서 토목섬유 인장강성 증가에 따른 변위 억제 및 말뚝효율 증가량에 대한 수치해석적 분석

Taehee Lee1
,
Su-Hyung Lee2
,
Il-Wha Koh2
,
Young-Hoon Jung3*
이 태희1
,
이 수형2
,
이 일화2
,
정 영훈3*
1Graduate Student, Dept. of Civil Eng., Kyung Hee Univ.
2Principal Researcher, Korea Railroad Research Institute
3Associate Prof., Dept. of Civil Eng., Kyung Hee Univ.
1경희대학교 사회기반시스템공학과 박사과정
2한국철도기술연구원 책임연구원
3경희대학교 사회기반시스템공학과 부교수
*교신저자. *Corresponding Author. 
30 April 2015. pp. 31-43
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Abstract

A numerical analysis on the effect of increasing tensile stiffness of the geosynthetics on the soil displacement and pile efficiency was conducted. Parametric studies by changing the stiffness of soft soil, internal friction and dilatancy angles of the embankment material, and flexual stiffness of the composite layer including the geosynthetics were carried out. In general, increasing stiffness of the geosynthetics improves the pile efficiency, whereas the amount of its improvement depends on the condition of parameters. In case of the sufficiently low stiffness of the soft soil or high flexual stiffness of the composite layer including the geosynthetics, a noticeable increase in the pile efficiency can be observed. When the stiffness of the soft soil is very low, the increase in the stiffness of the geosynthetics can significantly reduce the vertical displacement in the piled embankment. When the flexual stiffness of the composite layer is sufficiently high, increasing stiffness of the geosynthetics can greatly improve the pile efficiency.

Keywords
Piled embankment
Displacement
Pile efficiency
Geosynthetics

성토지지말뚝구조의 다양한 조건에서 토목섬유의 인장강성 변화가 성토체 및 토목섬유의 연직변위와 말뚝효율에 미치는 영향을 수치해석적으로 평가하였다. 매개변수 해석을 위해 연약지반의 강성, 성토재의 내부 마찰각과 팽창각, 토목섬유를 포함한 복합 재료층의 휨 강성을 변화시켰다. 토목섬유의 인장강성이 증가하면 말뚝효율이 증가하지만 그 증가량은 해석 조건에 따라 다르다. 성토재의 내부 마찰각이 매우 낮거나 복합 재료층의 휨 강성이 매우 높으면 뚜렷한 말뚝효율 증가가 나타났다. 연약지반의 강성이 매우 낮은 경우에 토목섬유의 인장강성을 증가시키면 뚜렷하게 연직 변위가 감소하였다. 복합 재료층의 휨 강성이 높으면 토목섬유 인장강성을 증가시켜 말뚝효율이 크게 향상되었다.

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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 : 31
  • No :4
  • Pages :31-43
  • Received Date : 2015-02-17
  • Revised Date : 2015-03-26
  • Accepted Date : 2015-04-09
  • DOI :https://doi.org/10.7843/kgs.2015.31.4.31
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