A slope cutaway shows a block above a plane parallel to the ground surface. Normal stress, pore pressure and downslope demand define the infinite-slope factor of safety. When FS falls below one, a capped rigid-block motion illustrates the loss of equilibrium.
• 3D scene parts: Slope terrain cutaway; potential sliding block; plane-parallel slip surface; pore-pressure stations; force and resistance directions. • Controls: Slope angle (15–45 °); Effective friction angle (20–38 °); Effective cohesion (0–20 kPa); Vertical depth to slip plane (1–5 m); Pore/total-normal stress ratio (0–0.8); Soil unit weight (16–22 kN/m³). • Live readouts: Infinite-slope factor; Total normal stress (kPa); Pore pressure (kPa); Effective normal stress (kPa); Driving shear stress (kPa); Available shear resistance (kPa); Capped block motion (m). • Guided experiments: Wet slope; Gentle dry slope; Steep frictional slope. • Four tabs (visual laboratory, curves and measurements, experiments, learn and assess), a model-verification run, a timestamped event log and a trial report.
σn=γ z cos²β; u=ru σn τdrive=γ z sinβ cosβ τresist=c′+(σn−u)tanφ′ FS=τresist/τdrive Illustrative block acceleration=g sinβ max(1−FS,0)
Infinite plane-parallel slope with vertical layer depth, constant effective strength, uniform pore ratio and no surcharge. Not a finite-slope Bishop/Spencer calculation. Motion is a simplified rigid-block illustration capped at 2 m; it does not predict landslide runout, deformation or speed. The safety ratio is not a project acceptance criterion. Try the preset experiments, then compare the live readouts with the equations.
No. It reduces effective normal stress.
No. The slip plane is parallel to the surface.
Infinite plane-parallel slope with vertical layer depth, constant effective strength, uniform pore ratio and no surcharge. Not a finite-slope Bishop/Spencer calculation. Motion is a simplified rigid-block illustration capped at 2 m; it does not predict landslide runout, deformation or speed. The safety ratio is not a project acceptance criterion.