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2019 Vol.35, Issue 2 Preview Page

Research Article

Numerical Simulation of Cone Penetration Tests in Sand Ground Using Critical State Mohr Coulomb Plasticity Model

한계상태 Mohr Coulomb 소성 모델을 활용한 콘관입시험의 수치적 모사

Sang Inn Woo1*
,
Choong-Ki Chung2
우 상인1*
,
정 충기2
1Member, Assistant Prof., Dept. of Civil and Environmental Engrg., Hannam Univ.
2Member, Prof., Dept. of Civil and Environmental Engrg., Seoul National Univ.
1정회원, 한남대학교 토목환경공학전공 조교수
2정회원, 서울대학교 건설환경공학과 교수
* Corresponding Author
28 February 2019. pp. 37-51
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Abstract

본 연구는 사질토 지반에서 수행되는 콘관입시험의 수치적 모사에 초점을 맞추고 있다. 지반은 한계상태 토질역학을 바탕으로 수정된 한계상태 Mohr Coulomb 소성 모델로 모사하였다. 한계상태 Mohr Coulomb 모델에서 팽창각은 상수가 아닌 현재상태와 한계상태 사이의 위상차의 함수로 표현된다. 수치적으로 콘관입시험은 대변위 해석을 요구하며, 이를 Lagrangian 유한요소법으로 해석하기 위해 관입 유도체 개념을 적용한 축대칭 조건 유한요소법을 이용하였다. 캘리브레이션 챔버에서 수행된 콘관입시험을 한계상태 Mohr Coulomb 모델을 이용하여 본 논문에서 제안된 유한해석 기법을 적용한 결과, 실험 결과와 유사한 결과를 얻을 수 있었다.

This study focuses on the numerical simulations of the cone penetration tests in a sand ground. The mechanical responses of sand were described using the modified Mohr Coulomb plasticity model based on the critical state soil mechanics. In the plasticity model, the dilatancy angle was not a constant, but a function of the distance to the critical state line from the current state of void ratio and mean effective stress. To simulate cone penetration tests numerically, this study relied on Lagrangian finite element method under the axisymmetric condition. To enable penetration of the cone penetrometer without tearing elements along the symmetric axis, the penetration guide concept was adopted in this study. The results of numerical simulations on the calibration chamber cone penetration tests had good agreement with the experimental results.

Keywords
Numerical Analysis
Sand
Critical State
Mohr Coulomb Plasticity
Cone Penetration Test

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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 :37-51
  • Received Date : 2019-01-08
  • Revised Date : 2019-01-23
  • Accepted Date : 2019-01-24
  • DOI :https://doi.org/10.7843/kgs.2019.35.2.37
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