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2023 Vol.39, Issue 2 Preview Page
Numerical Study on the Stress-distribution Ratio of Grouting Pile for Reinforced Ground

지반보강용 그라우팅 말뚝의 응력분담비에 대한 수치해석적 연구

Gyeong-Ju Yi1
,
Joon-Kyu Lee2
,
Weiwei Zhang3
,
Ki-Il Song4*
이 경주1
,
이 준규2
,
張 維維3
,
송 기일4*
1Member, Ph. D Student, Dept. of Civil Engrg, INHA Univ. / SQ Engineering, Executive Managing Director
2Member, Associate Prof., Dept. of Civil Engrg, University of Seoul
3Ph. D Student, Dept. of Civil Engrg, INHA Univ.
4Member, Prof., Dept. of Civil Engrg, INHA Univ.
1정회원, 인하대학교 토목공학과 박사과정, 에스큐엔지니어링 전무
2정회원, 서울시립대학교 토목공학과 부교수
3비회원, 인하대학교 토목공학과 박사과정
4정회원, 인하대학교 토목공학과 교수
*Corresponding Author
28 February 2023. pp. 19-30
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Abstract

Underground structures, such as compacted sand piles applied as soft ground countermeasures, are analyzed for settlement and stability by the composite ground design method. The basic principle of the composite ground design method is the arching effect. The reinforcing effect of the pile is evaluated as the stress-distribution ratio. When applying grouting piles with elastic properties using the ground reinforcement method, the existing stress-distribution ratio was only considered when the pile was installed. This study shows that the method of applying the stress-distribution ratio applied in previous studies should be changed when the ground reinforcement pile is installed at an arbitrary location in the ground without raising it to the ground surface. When high strength jet routing is applied, the stress-distribution ratio (n) to the in-situ ground generally ranges from 30 to 50. However, if the pile is located far from the surface and the depth goes down to the boundary depth of the stress sphere, the stress-distribution effect rapidly decreases, and the stress-distribution ratio converges to 1.5.

Keywords
Ground-aching effect
Grouting pile
Jet-grouting method
Soft ground
Stress-distribution ratio

연약지반 대책공법으로 적용되는 다짐모래말뚝과 같은 지중구조물은 주로 복합지반 설계법에 의해 침하 및 안정성을 분석한다. 복합지반 설계법의 기본원리는 아칭효과이며 말뚝의 보강효과는 응력분담비로 평가한다. 탄성적 특성을 갖는 그라우팅 말뚝을 지반보강공법으로 적용할 때 기존의 응력분담비 평가는 말뚝이 지표까지 설치되어 상재하중이 말뚝과 원지반에 같이 직접 재하되는 경우만을 고려해 왔다. 본 연구에서는 지반보강 말뚝의 설치를 지표까지 올리지 않고 지중 어느 위치에서 마감할 때에는 지금까지의 연구들에 의해 적용된 응력분담비 적용 방법이 달라져야 한다는 것을 보여주었다. 고강도 Jet grouting이 적용되었을 때 원지반에 대한 그라우팅 말뚝의 응력분담비(n)는 통상 30~50 범위의 값을 적용한다. 그러나 이는 지표까지 말뚝이 놓이는 경우이고 말뚝 상단의 위치가 지표로부터 멀리 깊게 위치될 경우 응력분담 효과가 급격히 저감되며 응력구(stress bulb) 경계가 되는 깊이부터는 정량적 값 1.5에 수렴했다.

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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 : 39
  • No :2
  • Pages :19-30
  • Received Date : 2022-12-12
  • Revised Date : 2023-02-03
  • Accepted Date : 2023-02-17
  • DOI :https://doi.org/10.7843/kgs.2023.39.2.19
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