EFFECTS OF SPATIAL VARIABILITY OF MARGINAL FILLS ON EXTERNAL STABILITY OF REINFORCED SLOPES

2019-11-15
Durmaz, Muhammet
Huvaj Sarıhan, Nejan
Turgut, Atalay Mert
Öztürk, Nur
Geosynthetic reinforced soil walls and slopes are typically designed using clean granular fills. In recent years, granular soils containing some percentages of fines content (marginal fills) are being used, e.g. 35% fines content is allowed in the granular fill by NCMA (2006), provided that sufficient drainage measures are taken. Designing with granular soils that can have variable proportions of fines content, leads to the consideration of variability of soil properties such as shear strength and unit weight. For this purpose, “spatial correlation length” can be used, small values of which mean that soil properties are highly fluctuated (variable) within a short distance. In this study, random limit equilibrium method is used to evaluate the effects of spatial variability, for a 10-m-high geosynthetic reinforced soil slope having a 70-degree slope angle, using lognormal probabilistic distribution of material properties. In generating random soil properties, Monte Carlo sampling method with 5000 samples are used, for unit weight, cohesion and friction angle of marginal fills. Both isotropic and anisotropic spatial correlation lengths are considered in the analyses. More than 24 random limit equilibrium analyses, assuming non-circular failure surfaces are performed. The effects of spatial variability on external stability of reinforced soil slope are evaluated, and it is highlighted that considering spatial variability leads to a slightly lower factor of safety in reinforced marginal fill slopes.
Citation Formats
M. Durmaz, N. Huvaj Sarıhan, A. M. Turgut, and N. Öztürk, “EFFECTS OF SPATIAL VARIABILITY OF MARGINAL FILLS ON EXTERNAL STABILITY OF REINFORCED SLOPES,” İstanbul, Türkiye, 2019, vol. 1, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/84279.