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Geomechanics and Engineering
  Volume 37, Number 4, May25 2024 , pages 359-370
DOI: https://doi.org/10.12989/gae.2024.37.4.359
 


Migration of fine granular materials into overlying layers using a modified large-scale triaxial system
Tan Manh Do, Jan Laue, Hans Mattsson and Qi Jia

 
Abstract
    The primary goal of this study is to evaluate the migration of fine granular materials into overlying layers under cyclic loading using a modified large-scale triaxial system as a physical model test. Samples prepared for the modified large-scale triaxial system comprised a 60 mm thick gravel layer overlying a 120 mm thick subgrade layer, which could be either tailings or railway sand. A quantitative analysis of the migration of fine granular materials was based on the mass percentage and grain size of migrated materials collected in the gravel. In addition, the cyclic characteristics, i.e., accumulated axial strain and excess pore water pressure, were evaluated. As a result, the total migration rate of the railway sand sample was found to be small. However, the total migration rate of the sample containing tailings in the subgrade layer was much higher than that of the railway sand sample. In addition, the migration analysis revealed that finer tailings particles tended to be migrated into the upper gravel layer easier than coarser tailings particles under cyclic loading. This could be involved in significant increases in excess pore water pressure at the last cycles of the physical model test.
 
Key Words
    cyclic characteristics; migration of fine granular materials; modified large-scale triaxial system
 
Address
Tan Manh Do: Department of Civil Engineering, University of Mining and Geology, Hanoi, Vietnam;
Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, Sweden
Jan Laue, Hans Mattsson and Qi Jia: Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, Sweden
 

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