Centrifuge modelling of the influence of slope height on the seismic performance of rooted slopes

作者：Teng Liang, Jonathan Adam Knappett · 发表于：Géotechnique · 年份：2017 · DOI：10.1680/jgeot.16.p.072 · 被引用次数：54 · 研究领域：Tree Root and Stability Studies、Soil Mechanics and Vehicle Dynamics、Plant responses to water stress

This paper presents an investigation into the influence of slope height on the role of vegetation to improve seismic slope stability. Dynamic centrifuge modelling was used to test six slope models with identical soil properties and model slope geometry within different centrifugal acceleration fields (10g and 30g, respectively) representing 1:10 and 1:30 scale slopes, that is, slopes of different height at prototype scale. A three-dimensional (3D) root cluster analogue representing a tap-root system, with root area ratio, root distribution and root length representative of a 1:10 and 1:30 scale tree root cluster (of rooting depth 1·5 m at prototype scale) was modelled using 3D printing techniques. A sequence of earthquake ground motions was applied to each model. The influences of filtering out low-frequency components of the earthquake motion, such as was necessitated at the lowest scaling factor owing to the practical limitations of the earthquake simulator, on dynamic amplification of motions within the slopes and the seismically induced slip, were first revealed. Subsequently, the effects of slope height on acceleration and deformation response of vegetated slopes were illustrated. It was found that the beneficial effects of roots on improving the seismic performance varied with the height of the slope. As an individual engineering technique for slope stabilisation, root reinforcement will not be such an effective solution for taller slopes, and complementary hard enginee...