IS 16327:2014 is the Indian Standard (BIS) for guidelines for design of geosynthetics in road embankments. This standard provides guidelines for the design of road embankments using geosynthetic materials. It covers design principles for reinforced soil embankments on both firm and soft foundations, as well as the use of geosynthetic-encased stone columns and piled embankments. The code specifies factors of safety, material properties, and design methodologies for ensuring stability.
Provides guidelines for the design and use of geosynthetics in road embankments.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Minimum Factor of Safety (Global Stability, Static) | 1.3 (as per Annex B) | 1.33 (equivalent to a resistance factor φ=0.75) | AASHTO LRFD |
| Interaction Coefficient (Pullout) for Geogrids | 0.8 (default value from Table 2) | 0.8 or 0.9 * tan(φ) (typical default values, though lab tests are preferred) | FHWA-NHI-10-025 |
| Creep Reduction Factor (RF_CR) for PET, 120-year life | 1.6 (from Table 1) | Typically 1.4-1.6, but requires extrapolation of 10,000-hr test data per ISO 20432 or ASTM D5262. | BS 8006-1 |
| Installation Damage Reduction Factor (RF_ID), good quality fill | 1.1 to 1.3 (depending on geosynthetic type, from Table 1) | 1.1 to 1.25 (typical range for well-graded sand/gravel) | FHWA-NHI-10-024 |
| Application Point of Seismic Inertial Force | 0.6H from the toe of the slope (where H is slope height) | 0.6H from the base of the reinforced mass | FHWA-NHI-10-025 |
| Partial Material Factor for Reinforcement Tensile Strength (γ_m) | Embedded within the product of Reduction Factors (RFs). | 1.25 to 1.4 for ULS (depending on consequence of failure and material). | BS 8006-1:2010 |