Slope Stability Analysis
Bishop, Janbu, Spencer, and Fellenius limit-equilibrium methods with an automated search for the critical failure surface. From soil profile to a defensible factor-of-safety report in minutes.
Open a free accountWhat it does
The Slope Stability tool runs limit-equilibrium analysis using established methods: Spencer, Bishop's Simplified, Janbu's Generalized, and the Ordinary (Fellenius) method. Enter your slope geometry, soil profile, and loading conditions — the solver computes inter-slice forces, evaluates equilibrium, and reports a factor of safety for each method.
Rather than requiring you to specify a trial surface, the tool performs an iterative grid search with auto-refinement across candidate failure surfaces to locate the critical one — the surface with the minimum factor of safety. The search covers both shallow and deep failure mechanisms automatically.
Output is a formatted PDF calculation report showing the critical failure surface geometry, per-slice tabulations, and final factors of safety across all methods. It's structured for direct submittal — no reformatting required.
GEOpetra's slope stability tool is unique in it's ability to generate a terrain model for any US location using USGS 3DEP elevation data. This allows you to run a slope stability analysis without needing to manually input the slope geometry, making it faster and easier to get results for real-world sites, even if a recent topographic survey is not available.
Methodology
Limit-equilibrium methods (Spencer, Bishop, Janbu, Fellenius)
Capabilities
- Automated terrain generated for any US site from USGS 3DEP data
- Spencer method (complete equilibrium, rigorous)
- Bishop's Simplified Method (moment equilibrium)
- Janbu's Generalized Method (force equilibrium)
- Ordinary / Fellenius method
- Grid search with auto-refine for critical surface
- Layered Mohr-Coulomb soil profiles (c, φ and undrained)
- Pore pressure via ru coefficient or piezometric line
- Pseudostatic seismic loading
- Distributed and point surcharge loads
- Tension crack consideration
- Per-slice force and moment tabulations
- Formatted PDF calculation report
Scope
The current version covers two-dimensional analysis of homogeneous and layered slopes under static and pseudostatic loading with circular slip surfaces. Reinforced slopes, non-circular surfaces, probabilistic analysis, and back-analysis are planned for future releases.