Exploring the micro-mechanics of triaxial instability in granular materials

J. C. Lopera Perez, C. Y. Kwok, C. O'Sullivan, X. Huang, K. J. Hanley
2016 Geotechnique  
14 The instability of granular materials due to water infiltration under fully drained conditions has been 15 previously considered in experimental studies. While laboratory experiments can provide macro-scale 16 insight into drained instability, the micro-mechanics under such conditions are yet to be explored. 17 This study has employed the Discrete Element Method (DEM) to simulate constant shear drained 18 (CSD) tests for an ideal soil. CSD tests were initiated from a range of packing
more » ... of packing densities and stress 19 conditions. The DEM simulations were able to qualitatively replicate laboratory CSD tests. The 20 choice of the loading control parameter was seen to play a central role in the macro-scale second-21 order work to identify an effective failure. All samples considered attained an onset of instability that 22 presented in this study indicate that the constant shear drained loading conditions can result in more 29 unfavourable situations than for undrained loading condition. 30 Keywords: Discrete-element modelling; fabric/structure of soils; particle-scale behaviour 31 32
doi:10.1680/jgeot.15.p.206 fatcat:7bhupxse3valfhxrc625cwruma