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Comparison between Soil Drainage Experiment and Finite Element Analysis for Air Diffusion in Multiphase Porous Media

다공성 매질내의 공기압 확산에 대한 실내 배수시험과 유한요소해석 비교분석

You-Seong Kim1
,
Jae-Hong Kim2*
,
Tae-Heon Kim3
,
Jin-Kwang Lee4
김 유성1
,
김 재홍2*
,
김 태헌3
,
이 진광4
1Prof., Dept. of Civil Engrg., Chonbuk National Univ.
2Research Prof., Dept. of Civil Engrg., Chonbuk National Univ.
3Graduate Student, Dept. of Civil Engrg., Chonbuk National Univ.
4Graduate Student, Dept. of Civil Engrg., Chonbuk National Univ.
1전북대학교 토목공학과 교수
2전북대학교 토목공학과 연구교수
3전북대학교 토목공학과 박사과정
4전북대학교 토목공학과 석사과정
*교신저자. *Corresponding Author. 
28 February 2014. pp. 77-85
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Abstract

The paper presents comparison between numerical and experimental results to verify finite element algorithm of air diffusion in three-phase porous media. The theory of two-phase flow in partially saturated soil is a fundamental study to predict the safety for CO2 sequestration. Geotechnical engineering problems exposed to atmospheric pressure generally assume that air pressure is equal to zero in three-phase porous media, but the geotechnical engineering problem at a depth of about over 1 km needs to be considered in connection with deformable solid skeleton due to air pressure. Therefore, the objective of this study is to validate the numerical algorithm by comparing with results obtained from measurement of air diffusion and dissipation through drainage test.

Keywords
Three-phase porous media
Partially saturated soil
Air diffusion
Finite element algorithm
Drainage test

3상으로 이루어진 다공성 매질 내에서 공기의 흐름을 확인하기 위해 실내시험과 수치해석 알고리즘의 비교분석을 하였다. 불포화 지반내의 유체의 흐름을 확인하는 연구는 이산화탄소 지중저장을 위한 안정성 예측을 위해 중요한 기초연구이다. 일반적으로 대기압에 노출되어 있는 지반공학적인 문제들은 3상 다공성 매질 내부에서 발생할 수 있는 공기압을 ‘0’으로 가정하고 해석하지만, 지중 1km 지점에서의 불포화토의 거동은 기체압력을 고려하여 지반의 변형과 연계해석이 필수적이다. 본 연구는 이러한 지중 깊숙한 곳에서 발생할 수 있는 불포화 지반의 거동을 해석하고자 공기압의 확산과 소산에 대한 수치해석과 실내배수시험을 비교분석하여 유한요소해석 알고리즘을 검증하고자 한다.

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Received : December 9th, 2013
19
Revised  : January 24th, 2014
20
Accepted : February 3rd, 2014
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 30
  • No :2
  • Pages :77-85
  • Received Date : 2013-12-09
  • Revised Date : 2014-01-24
  • Accepted Date : 2014-02-03
  • DOI :https://doi.org/10.7843/kgs.2014.30.2.77
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