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Optimum to Effective Soil Nail Inclination for Slope Stability using GeoStudio
| International Journal of Computer Applications |
| Foundation of Computer Science (FCS), NY, USA |
| Volume 187 - Number 129 |
| Year of Publication: 2026 |
| Authors: Md. Naimur Rahman |
10.5120/ijca41e470e402df
|
Md. Naimur Rahman . Optimum to Effective Soil Nail Inclination for Slope Stability using GeoStudio. International Journal of Computer Applications. 187, 129 ( Jul 2026), 10-15. DOI=10.5120/ijca41e470e402df
Abstract
Soil nailing is a widely adopted and cost-effective technique for enhancing the stability of soil slopes in excavations, landslide-prone areas, and infrastructure projects. In this paper, with optimum soil nail inclination angle, an attempt has been made to find an effective way of nailing the slopes for better stability in terms of Factor of Safety (FOS). Using SLOPE/W (GeoStudio 2018 R2), several nail inclination angles with a horizontal axis were applied to a simulated homogenous soil slope (slope angles 30°, 45°, 60°, 75°, and 90°) to get a higher Factor of Safety. The factor of safety was calculated using the Mohr-Coulomb expression and the limit equilibrium (LE) approach in the Morgenstern-Price method, considering pore water pressure as the Ru value. The results indicate that using the upper nails inclination angle below the optimum angle (25° for 30° and 45°, 20° for 60°, and 15° for 75° and 90° soil slopes) used in the lower nails increases the Factor of Safety for gentle (30°) and medium (45° and 60°) soil slopes. The upper nails inclination angle ranging from 5° to 15° gives a higher value of FOS than with the optimum nail inclination angle for those slopes, but for the steep soil slopes (75° and 90°) the higher FOS value is obtained by nailing the upper and lower nails with the optimum inclination angle. Better stability and a greater Factor of Safety (FOS) result from nailing a soil slope with the optimum nail inclination angle at the lower nails and a lower nail inclination angle at the upper nails (between 5° and 15°) for gentle and medium soil slopes and for steep slopes with optimum nail inclination all over the slope.
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