Finite Element Analysis of Partially Saturated Soil Considering Pore-air Pressure

Kim, Jae Hong; Hwang, Young-Cheol

doi:10.7843/kgs.2011.27.3.095

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…불포화 지반에서 간극 을 통한 공기의 흐름이 물의 침투에 영향을 미친다는 것은 실 험과 해석을 통하여 잘 알려져 있다 (Touma and Vauclin, 1986;Sun et al, 2015). 그러나 지반공학 분야에서는 일반적 으로 이러한 공기의 흐름은 무시되어 간극공기압을 대기압과 같다고 가정하며, 특별한 문제의 경우에만 공기의 흐름을 고 려한 해석이 수행되고 있다(e.g., Kim and Hwang, 2011;Shin, 2011). (1) (2) 여기서, k w ij 는 포화 이동계수(saturated mobility coefficient), κ r 는 포화도 S w 의 함수인 유체의 상대침투(relative permeability), µ는 동점성(dynamic viscosity), P는 간극압(pore pressure), ρ는 유체의 밀도, g는 중력가속도이다.…”

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Stability Analysis of Unsaturated Soil Slope Considering Rainfall Infiltration by Two-Pahse Flow Model

Cho¹

2015

Journal of Korean Society of Hazard Mitigation

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서 론우리나라는 AbstractMost previous studies on the rainfall infiltration and its influence on slope stability were based on the single-phase water flow model. The purpose of this study is to study the effect of interaction of air and water flow on the slope stability. In this study, two-phase flow analyses were conducted for weathered residual soil slopes with thin soil overlying impermeable bedrock. Results of the flow analysis were used as input for stability analysis by strength reduction method. Strength reduction method considers mechanical equilibrium to evaluate the effect of rainfall infiltration on the slope stability. The results show that remarkable delaying effects by air flow on the propagation of the wetting front and the deterioration of slope when surface ponding occurs during infiltration. On the other hand, the influence of the pore air flow on the slope stability can be neglected in the non-ponding situation with small rainfall intensity.

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Stability Analysis of Unsaturated Soil Slope Considering Rainfall Infiltration by Two-Pahse Flow Model

Cho¹

2015

Journal of Korean Society of Hazard Mitigation

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Influence of Soil Characteristic and Rainfall Intensity on Matric Suction of Unsaturated Weathered Soil Slope

김용민¹,

이광우²,

김정환³

2013

Journal of The Korean Society of Civil Engineers

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The monolithically coupled finite element analysis for a deformable unsaturated soil slope is performed to investigate matric suction distribution on a soil slope subjected to rainfall infiltration, which can consider the hydraulic-mechanical characteristics for the analysis. The soil-water characteristic curves (SWCC) are experimentally determined to estimate three types of hydraulic properties of domestic areas. Based on the physical properties, the distribution of matric suction is investigated by considering the major factors, such as soil conditions, rainfall intensities, and slope angles. It is found from the results of this study that the matric suction rapidly decreases with an increase in rainfall intensity, regardless a slope angle. The slope surface is more easily saturated when its saturated hydraulic conductivity is smaller than rainfall intensity, and for the case of multi-layered soil slope, hydraulic characteristics of slope surface has a significant influence on matric suction distribution.

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

Kim¹,

Kim²,

Kim³

et al. 2014

Journal of the Korean Geotechnical Society

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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.

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Finite Element Analysis of Partially Saturated Soil Considering Pore-air Pressure

Cited by 4 publications

References 9 publications

Stability Analysis of Unsaturated Soil Slope Considering Rainfall Infiltration by Two-Pahse Flow Model

Stability Analysis of Unsaturated Soil Slope Considering Rainfall Infiltration by Two-Pahse Flow Model

Influence of Soil Characteristic and Rainfall Intensity on Matric Suction of Unsaturated Weathered Soil Slope

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

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