Behaviour of geosynthetic in anchored geosynthetic-reinforced slopes subjected to seepage

Abstract

The anchored geosynthetic system (AGS) is a technique to improve the stability of unstable or quasi-stable slopes. In this study, the behaviour of geosynthetic in slopes reinforced with AGS subjected to seepage is investigated. Centrifuge model tests were carried out at 50g centrifuge acceleration on silty sand slopes with an inclination of 63·4° (2V:1H) and reinforced with AGS. Seepage was generated by gradually raising the water table within the reinforced slope models. By means of a digital image analysis technique, the behaviour of the surface geosynthetic during the seepage was studied and the compressive stresses produced beneath the geosynthetic were determined. Limit equilibrium stability analyses were conducted with the application of AGS loads measured by digital image analyses. The results indicate that the maximum tension mobilised in the geosynthetic during seepage depends on the tension induced in the geosynthetic due to the anchorage prior to introducing seepage. Furthermore, including the compressive stresses produced by the tensioned geosynthetic in the analyses gives a more realistic value for the safety factors.

A Systematic Review of Physical Modelling Techniques, Developments and Applications in Slope Stability Analyses

“…Some studies have utilised foam sheets, particularly on the front and back boundaries of model walls, to address this shortcoming [86][87][88]. In contrast, others have employed glycerin or petroleum jelly to limit the friction between slope material and container walls [89,90]. It is worth noting that the use of mixed container boundaries (a combination of flexible band rigid boundaries) on selected sides poses concerns about the biased orientation of failure plane development and progression which is towards the flexible boundaries [91].…”

“…λ = 25), density (C ρ = 1), and elasticity modulus (C E = 25). In another study by Guo et al [90], they predicted failure surface using centrifuge model tests on soil slope anchored with a geosynthetic system under seepage conditions. Soil strength parameters (cohesion and internal friction angle) and coefficient of permeability were the fundamental parameters, and their scaling coefficients were adopted from the work by Rajabian et al [105], which was N = 1.…”

“…Other studies using Geostudio include [12,57]. Rajabian and Viswanadham [90] used SLIDE software to supplement results obtained from centrifuge tests CM FDM Nasiri and Hajiazizi [153] investigated the performance of geotextile-encased stone columns on sandy embankments using the finite difference method. Likewise, centrifuge tests and FLAC 2D simulation were used to investigate the amplification effects and deformation conditions in a dormant loess-mudstone landslide [176].…”