This slope stability calculator utilizes an analytical model to determine the factor of safety of a reinforced geosynthetic lined slope. This calculator assumes that no seepage forces are present, the unit gradient calculator can be used to calculate the required transmissivity of the drainage geocomposite.

The allowable tensile strength of the geosynthetic reinforcement (T_allow) is calculated as follows:

Design Input
Slope characteristics
Thickness of the cover soil (h)		m
Slope angle (ß)		degrees
Length of slope measured along geomembrane (L)		m
Soil characteristics
Unit weight of the cover soil (g)		kN/m³
Friction angle of the cover soil (f)		degrees
Cohesion of the cover soil (c)		kN/m²
Interface friction angle (d)		degrees
Interface adhesion (Ca)		kN/m²
Reinforcement characteristics
Ultimate tensile strength of geosynthetic reinforcement (T_ult)		kN/m
Reduction factor for installation damage (RF_id)
Reduction factor for creep (RF_cr)
Reduction factor for chemical/biological degradation (RF_cbd)
Reduction factor for seams (RF_sm)

References

R. M. Koerner, and T-Y. Soong, 1998. "Analysis and Design of Veneer Cover Soils". Proceedings of 6^th International Conference on Geosynthetics, Vol. 1, pp. 1-23, Atlanta, Georgia, USA.