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2024 Vol.23, Issue 4 Preview Page

Research Article

Change of Cone Penetration Load with Textured Shaft: Numerical Study

돌출부를 갖는 콘의 관입 하중 변화: 수치해석 연구

Tae-Young Kim1
,
Ngọc Văn Đinh2
,
Song-Hun Chong3*
김 태영1
,
띤 응옥반2
,
정 성훈3*
1Graduate Student, Department of Civil Engineering, Sunchon National University, 255 Jungang-ro, Sunchon-si, Jeollanam-do, Sunchon 57922, Republic of Korea
2Undergraduate Student, Department of Civil Engineering, Sunchon National University, 255 Jungang-ro, Sunchon-si, Jeollanam-do, Sunchon 57922, Republic of Korea
3Member, Professor, Department of Civil Engineering, Sunchon National University, 255 Jungang-ro, Sunchon-si, Jeollanam-do, Sunchon 57922, Republic of Korea
*Corresponding Author
31 December 2024. pp. 51-60
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Abstract

Recently, bio-inspired technology utilizing the anisotropy of friction between structure-soil has garnered significant attention. In particular, new pile designs not only enhance shaft friction but also gain prominence by reducing the use of cement, which has traditionally been a key material in ground treatment and improvement. Previous studies have quantitatively verified the increase in interface shear resistance through direct shear tests and cone penetration experiments. However, conventional finite element analysis methods face limitations in analyzing the shaft friction behavior between piles with scale and the surrounding soil. In this study, the Coupled Eulerian-Lagrangian (CEL) technique, a large deformation analysis method built-in ABAQUS, is employed to simulate the penetration of cone with textured shaft. Numerical analyses are conducted to investigate changes in cone penetration resistance according to the geometric characteristics of the surface scale. To minimize numerical errors occurring in the cone and surrounding soil meshes, a three-dimensional generalized mesh is proposed for the cone and its surrounding elements. A total of 13 cases, comprising seven different cone designs and two penetration direction conditions, are analyzed. The results showed that under the same penetration load, penetration depth decreased as the scale height increased, the scale length narrowed, and the scale tapered in height.

Keywords
Bio-inspired technology
Coupled Eulerian-Lagrangian technique
Large deformation analysis
Cone penetration resistance
Scale geometry

최근에 구조물-흙의 마찰 이방성을 이용한 생물학적 모방 기술(bio-inspired technology)이 크게 주목 받고 있다. 특히, 새로운 말뚝 형태는 말뚝의 주면 마찰을 증가시킬 뿐만 아니라, 기존에 지반 처리 및 개량에서 주로 사용된 시멘트를 줄이므로 크게 각광을 받고 있다. 기존 연구에서는 경계면 직접전단 시험과 콘 관입 실험을 통하여, 경계면 전단 저항의 증가를 정량적으로 확인하였다. 하지만, 돌출부를 갖는 말뚝과 주변 흙 사이에서 발생하는 주면 마찰력 거동 특성을 분석하기 위한 기존의 유한 요소 해석 기법은 한계가 있다. 본 연구에서는 표면 돌출부를 갖는 콘 관입 과정을 모사하기 위하여 ABAQUS에 내장된 대변형 해석 기법인 Coupled Eulerian-Lagrangian(CEL) 기법을 사용하여, 표면 돌출부의 기하학적 형상에 따른 콘 관입 하중 변화에 대한 수치해석 연구를 수행하였다. 우선, 콘과 콘 주변 메쉬에서 발생하는 수치 해석 오차를 최소화하기 위해서, 콘과 주변 지반에 3차원 일반화된 메쉬를 제안하였다. 7개의 다른 콘과 2개 관입 방향조건으로 총 13 케이스에 대해서 수치 해석을 수행하였다. 해석 결과는 동일한 관입 하중에서 돌출부 높이가 높을수록, 돌출부 길이가 좁을수록, 그리고 돌출부 높이가 감소하는 방향으로 콘 관입량이 적게 발생하였다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 23
  • No :4
  • Pages :51-60
  • Received Date : 2024-11-21
  • Revised Date : 2024-11-22
  • Accepted Date : 2024-11-25
  • DOI :https://doi.org/10.12814/jkgss.2024.23.4.051
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