Hydro-mechanical response with respect to the air ventilation for water filtration in homogeneous soil

When water penetrates into soil, interstitial air can become trapped by the infiltrating water. Neglecting the effect of air ventilation could cause deviations in the predicted pore water pressure and the associated effective stress. This study aims at the effect of air ventilation on the coupled hy...

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Bibliographic Details
Published in:Journal of mountain science 2019-11, Vol.16 (11), p.2562-2576
Main Authors: Lee, Wei-Lin, Tai, Yih-Chin, Shieh, Chjeng-Lun, Miyamoto, Kuniaki, Lin, Yu-Feng
Format: Article
Language:English
Subjects:
Air
Cylinders
Earth and Environmental Science
Earth Sciences
Ecology
Environment
Geography
Hydrostatic pressure
Infiltration
Mechanical analysis
Mechanical properties
Pore pressure
Pore water
Pore water pressure
Soil
Soil columns
Soil investigations
Soil mechanics
Soil properties
Soil stresses
Soil water
Soils
Ventilation
Water filtration
Water pressure
Water purification
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Summary:When water penetrates into soil, interstitial air can become trapped by the infiltrating water. Neglecting the effect of air ventilation could cause deviations in the predicted pore water pressure and the associated effective stress. This study aims at the effect of air ventilation on the coupled hydromechanical responses in homogeneous soil during infiltration. A schematic concept of infiltration conditions (open- and closed-valve) in homogeneous soil is proposed for investigating their impacts on the pore water pressure and effective stress. Experiments of vertical soil column filled with Ottawa sand (ASTM C778 20/30) were designed for two types of air ventilation (namely, open and closed infiltration). The evolution of pore water pressure at the cylinder bottom was recorded, and served as a benchmark problem for evaluating the coupled hydro-mechanical response. Coding with the commercial software, GeoStudio, was employed for the dynamic behaviors of pore-water and -air pressures as well as the evolving effective stress. It was found in both the experiments and numerical investigations that the infiltration condition plays a crucial role for the ascending rate of pore water pressure as well as the associated effective stress. These results illustrate the inevitable impacts of the air ventilation conditions on the mechanical properties of the soil during infiltration.
ISSN:1672-6316
1993-0321
1008-2786
DOI:10.1007/s11629-019-5643-0