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2020 Vol.36, Issue 8 Preview Page

Research Article

Influencing Factors on Freezing Characteristics of Frost Susceptible Soil Based on Sensitivity Analysis

민감도 분석을 기반으로 한 시료의 동결 특성에 미치는 영향인자 분석

Gyu-Hyun Go1
,
Jangguen Lee2*
,
Minseop Kim3
고 규현1
,
이 장근2*
,
김 민섭3
1Member, Assistant Prof., Dept. of Civil Engrg., Kumoh National Institute of Technology
2Member, Research Fellow / Head of Center, Extreme Engrg. Research Center, Korea Institute of Construction and Technology
3Graduate Student, Dept. of Civil and Environmental Engrg., Korea Advanced Institute of Science and Technology
1정회원, 금오공과대학교 토목공학과 조교수
2정회원, 한국건설기술연구원 극한환경연구센터 연구위원 / 센터장
3비회원, 한국과학기술원 건설및환경공학과 박사과정
* Corresponding Author
31 August 2020. pp. 49-60
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Abstract

동상민감성 시료의 동상 거동을 평가하기 위해 완전히 결합된 열-수리-역학 연계해석을 수행하였다. 이를 위한 구성모델은 질량보존방정식, 에너지보존방정식, 힘평형방정식을 기반으로 유도되었다. 구성모델을 통해 간극수의 상변화, 간극수 유동 및 수반되는 기계적 변형 등 1차원 동결에 대한 다양한 물리적 현상을 정량적으로 고려할 수 있었다. 한편, 시료의 동상발생량 및 동상속도에 미치는 영향 인자들을 조사하기 위해 민감도 분석 연구가 수행되었다. 민감도 분석 결과에 따르면, 시료의 초기 간극비는 종속변수인 동상발생량과 동상속도에 독립적으로 큰 영향을 미치는 반면 흙 입자 열전도도 및 온도구배는 독립적으로 미치는 영향보다 두 변수 간 상호 작용을 통해 더 큰 영향을 미침을 확인하였다. 본 연구에서 고려된 인자들은 모두 동상발생량과 동상속도에 영향을 미치는 주요 인자이며, 표본 시료의 동상민감성 여부를 결정하는 데에 활용될 수 있을 것이다.

A fully coupled thermo-hydro-mechanical model is established to evaluate frost heave behaviour of saturated frost-susceptible soils. The method is based on mass conservation, energy conservation, and force equilibrium equations, which are fully coupled with each other. These equations consider various physical phenomena during one-dimensional soil freezing such as latent heat of phase change, thermal conductivity changes, pore water migration, and the accompanying mechanical deformation. Using the thermo-hydro-mechanical model, a sensitivity analysis study is conducted to examine the effects of the geotechnical parameters and external conditions on the amount of frost heave and frost heaving rate. According to the results of the sensitivity analysis, initial void ratio significantly affects each objective as an individual parameter, whereas soil particle thermal conductivity and temperature gradient affect frost heave behaviour to a greater degree when applied simultaneously. The factors considered in this study are the main factors affecting the frost heaving amount and rate, which may be used to determine the frostbite sensitivity of a new sample.

Keywords
Finite element method
Frost heave
Metamodels
Sensitivity analysis
Thermo-hydro-mechanical model

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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 : 36
  • No :8
  • Pages :49-60
  • Received Date : 2020-05-13
  • Revised Date : 2020-06-01
  • Accepted Date : 2020-06-01
  • DOI :https://doi.org/10.7843/kgs.2020.36.8.49
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