Abstract
The cyclic shearing response of granular materials is highly influenced by various parameters such as void ratio (e), confining stress (p′), initial static shear stress (qs), cyclic deviatoric stress (qcyc), stress reversal and non-stress reversal conditions. Traditionally, most liquefaction studies evaluated the influence of e, p′, qcyc and reversals on isotropically consolidated specimens where qs is zero. However, a soil element in a level ground is normally or K0 consolidated and hence subjected to a qs. Extensive studies have suggested that qs may dramatically alter the pore water pressure generation (Δu), deviatoric strain (εd) and soil fabric for same e, p′ and qcyc. In order to evaluate the effect of qs alone, it is required to produce replicated specimens through different consolidation paths to achieve different qs. Since, it is hard to replicate specimens and assess soil fabric in laboratory, this study used an alternative approach, discrete element method (DEM), which has reproducibility and trace micromechanical parameters such as coordination number, CN and fabric. It is found that Δu, CN and fabric were significantly affected by consolidation path and corresponding qs conditions. This study provides a good understanding on the effect of qs on cyclic response of soils.
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Acknowledgements
The authors would like to acknowledge Professor Matthew R. Kuhn of University of Portland, USA for his DEM software OVAL. The first author, Rohini Kolapalli, would like to acknowledge the Australian Department of Education’s Australian Postgraduate Award (APA) which facilitated her to conduct research on her Ph.D. dissertation at the University of South Australia.
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Kolapalli, R., Rahman, M.M., Karim, M.R., Nguyen, H.B.K. (2020). A Micromechanical Study on the Effect of Initial Static Shear Stress on Cyclic Shearing Response. In: Prashant, A., Sachan, A., Desai, C. (eds) Advances in Computer Methods and Geomechanics . Lecture Notes in Civil Engineering, vol 56. Springer, Singapore. https://doi.org/10.1007/978-981-15-0890-5_13
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DOI: https://doi.org/10.1007/978-981-15-0890-5_13
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