首页|FEM Analysis on Isotropic Consolidation of Unsaturated Soils Using Ceramic Disks and Microporous Membrane Filters for Suction Control

FEM Analysis on Isotropic Consolidation of Unsaturated Soils Using Ceramic Disks and Microporous Membrane Filters for Suction Control

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  • NSTL
  • Amer Soc Testing Materials
Microporous membrane (MM) filters with a significantly thin thickness have recently been usedas an alternative to ceramic disks for matric suction control in the axis-translation technique forelement tests on unsaturated soils. Although researchers have highlighted some discrepanciesin test results when ceramic disks and MM filters are used, the mechanism leading to thesediscrepancies has not yet been clarified. In this study, suction-controlled triaxial tests werefirst conducted on unsaturated completely decomposed granite using two filters. Then, it isnatural to believe that the different thicknesses of ceramic disk and MM filters may significantlyinfluence the suction equilibrium process of specimens. To clarify this issue, soil-water-aircoupled finite element modeling was performed to simulate the consolidation process in triaxialtests as an initial/boundary value problem. In the numerical calculation, the influence ofthe void ratio on the water retention curve (WRC) of soil was properly considered by adoptinga deformation-dependent WRC model. In particular, the ceramic disk and MM filter, along withthe specimens, were modeled, and their differences in thickness were considered. The calculatedresults show that a nonuniform distribution of suction occurred in the ceramic disk, leadingto greater drainage discharge of the specimens. In other words, the influence of thethickness difference between the MM filter and ceramic disk cannot be neglected. However,regardless of whether ceramic discs or MM filters are used, the uneven distribution of the statevariables in the specimens may occur in the triaxial tests for unsaturated soils, which emphasizesthe importance of assessing the soil tests using the present axis-translation technique asinitial/boundary value problems.

unsaturated soilceramic diskmicroporous membrane filteraxis-translation techniquefinite element modeling simulation

Xi Xiong、Shun-ichi Kobayashi、Hiroyuki Izumi、Feng Zhang

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Faculty of Geoscience and CivilEngineering, Institute of Scienceand Engineering, KanazawaUniversity, Natural Science andTechnology Hall 2, Kanazawa,Ishikawa 920-1192, Japan

Department of Civil Engineering,Nagoya Institute of Technology,Hall 16, Gokiso-cho, Showa-ku,Nagoya, Aichi 466-8555, Japan

Department of Civil Engineering,Nagoya Institute of Technology,Hall 16, Gokiso-cho, Showa-ku,Nagoya, Aichi 466-8555, Japan||Department of Civil Engineering,Tongji University, 1239 Siping Rd.,Yangpu District, Shanghai200092, China

2024

10.1520/GTJ20230439

Geotechnical testing journal

Geotechnical testing journal

SCI
ISSN：0149-6115
年,卷(期)：2024.47(6)
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