Abstract
In this study, we develop an innovative stacked ring torsional shear apparatus for multiple liquefaction tests of fully saturated sands. Stacked rings are built upon an existing hollow cylinder torsional shear apparatus to impose lateral constraint to the soil sample, such that multiple liquefaction can be tested in a fully saturated state. In this project, we used pressure compensation technique to reduce vertical friction between the sample and the ring direct contact force between the membrane and the rings such that the vertical stress will be much more uniformly distributed along the sample height. The new stacked ring device facilitates investigation of fabric evolution and its effect on reliquefaction resistance of sands.
To further study the fundamental mechanism of the multiple liquefaction phenomenon, 3D clumped discrete model is used to construct realistic particle packings, and simulate fabric evolution during liquefaction-reconsolidation-reliquefaction process. The study reveals that strain history significantly influences the number of inter-particle contact and fabric anisotropy after reconsolidation, hence the subsequent liquefaction resistance greatly varies. The increase in relative density due to reconsolidation has only secondary effects. The state-of-the-art DEM simulation provides micromechanical insights into the fundamental mechanism of the multiple liquefaction phenomenon.
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Acknowledgements
The study is supported by research grant No. 52179134 from National Natural Science Foundation of China, and grant No. 16214220 from Hong Kong Research Grants Council.
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Huang, D., Yuan, Z., Yang, S., Amini, P.F., Wang, G., Jin, F. (2022). Multiple Liquefaction of Granular Soils: A New Stacked Ring Torsional Shear Apparatus and Discrete Element Modeling. In: Wang, L., Zhang, JM., Wang, R. (eds) Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 2022). PBD-IV 2022. Geotechnical, Geological and Earthquake Engineering, vol 52. Springer, Cham. https://doi.org/10.1007/978-3-031-11898-2_28
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