Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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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

  • Received : 2013.12.09
  • Accepted : 2014.02.03
  • Published : 2014.02.28
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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 $CO_2$ 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.

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.

Keywords

References

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