Modelling the seismic performance of root-reinforced slopes using the finite-element method

• DOI: 10.1680/jgeot.17.p.128
• Publication Date: 2019-04-11T14:17:29Z
• Authors: Teng Liang; Jonathan Adam Kna...; Anthony K. Leung; A. Glyn Bengough
• Keywords: Centrifuge; Cohesion (chemistry); Crest

This paper investigates the seismic performance of rooted granular slopes using dynamic finite-element analysis, validated against recently published centrifuge test data. The importance selecting suitable strength parameters to represent soil response within a strain-hardening constitutive model was demonstrated and simulations suggested that any boundary effects introduced through use equivalent shear beam container in are negligible can be represented by semi-infinite lateral condition. Using model, parametric study investigated different properties on heights. Vegetation effective reducing deformations at crest modest height, although benefit reduced as slope height or apparent cohesion increased. effectiveness significantly affected extent root system, but only moderately sensitive cohesion, insensitive stiffness damping soil. Plant species possessing deep extensive systems therefore recommended for stabilisation rather than those with strongest roots. For modelling purposes, it is sufficient able quantify its area influence. magnitude improvement from vegetation terms decreasing permanent slip also found construction method used (i.e. compacted/uncompacted embankment cutting) drained slopes.