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Geotechnical and Geological Engineering

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07-05-2022 | Original Paper

Numerical Analysis of Infiltration in One-Dimensional Unsaturated Soil–Geotextile Column

Authors: G. B. Castro, A. T. Siacara, A. Nardelli, L. Lenzi, M. M. Futai

Published in: Geotechnical and Geological Engineering | Issue 8/2022

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Abstract

Numerical modelling development for capillary barrier investigation considering unsaturated soil–geotextile interface has been studied and evaluated in recent years. Most engineering constructions involving geomaterials and geotextiles application, such as reinforced walls, slopes, embankments, and roads, require understanding the hydraulic performance of those systems for design purposes (capillary barrier, drainage, filtration, etc.). Considering that the hydraulic behavior of those materials is directly dependent on their saturated–unsaturated state over time, unsaturated principles should be applied for their long-term evaluation. This paper presents a 1D (one-dimensional) numerical analysis of an unsaturated system composed of soil and gravel layers separated by a geotextile in a column laterally impermeable (2.0 m). A non-woven geotextile was applied considering different soil types from the literature, such as silty sand, sandy, compacted residual silty, bimodal, and compacted residual sandy soils. A SEEP/W finite element numerical model was developed to perform transient analyses through the system to evaluate its hydraulic performance in terms of capillary barrier formation considering different geomaterials combinations in different hydraulic conditions. A significant influence of geotextile hydraulic conductivity and water flow rate were verified on the capillary barrier effect. Also noticed were the different height and duration of capillary barrier formation for different soil profiles. A design chart-table was proposed to evaluate soil–geotextile performance in terms of capillary barrier for new geotechnical designs. Finally, it could be inferred that fine-grained soils demonstrated to develop higher and longer water column (positive pore pressure) compared to coarse-grained soils, independently of their initial suction.

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Title: Numerical Analysis of Infiltration in One-Dimensional Unsaturated Soil–Geotextile Column
Authors: G. B. Castro
A. T. Siacara
A. Nardelli
L. Lenzi
M. M. Futai
Publication date: 07-05-2022
Publisher: Springer International Publishing
Published in: Geotechnical and Geological Engineering / Issue 8/2022
Print ISSN: 0960-3182
Electronic ISSN: 1573-1529
DOI: https://doi.org/10.1007/s10706-022-02144-3

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