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Slide2 Overview

Slide2 is a 2D slope stability program for evaluating the safety factor or probability of failure, of circular or non-circular failure surfaces in soil or rock slopes. Slide2 is very simple to use, and yet complex models can be created and analyzed quickly and easily. External loading, groundwater and support can all be modelled in a variety of ways.

Slide2 analyzes the stability of slip surfaces using vertical slice or non-vertical slice limit equilibrium methods (e.g. Bishop, Janbu, Spencer, Sarma, etc). Individual slip surfaces can be analyzed, or search methods can be applied to locate the critical slip surface for a given slope. Deterministic (safety factor) or probabilistic (probability of failure) analyses can be carried out.

Features include:

  • Critical surface search methods for circular or non-circular slip surfaces
  • Analysis methods include Bishop, Janbu, Spencer, GLE / Morgenstern-Price
  • Multiple materials
  • Anisotropic, non-linear Mohr-Coulomb materials
  • Probabilistic analysis – calculate probability of failure, reliability index (see below)
  • Sensitivity Analysis
  • Groundwater – piezo surfaces, Ru factors, pore pressure grids, finite element seepage analysis (see below), excess pore pressure (B-bar method)
  • Finite element groundwater seepage for steady-state or transient conditions
  • Rapid drawdown analysis
  • Tension crack (dry or water-filled)
  • External loading – line, distributed or seismic
  • Support – soil nails, tiebacks, geotextiles, piles. Infinite strength (slip surface exclusion) zones
  • Back analysis of required support force for a given safety factor
  • Back analysis of material strength using sensitivity or probabilistic analysis
  • View any or all surfaces generated by search
  • Detailed analysis results can be plotted for individual slip surfaces


Finite element groundwater (seepage) analysis, for steady-state or transient conditions, is built right into the Slide2 program. See the Groundwater Analysis with Slide2 topic for more information.


Slide2 also has extensive probabilistic modelling and analysis features. Nearly all model input parameters can be defined as random variables, so that a probability of failure or reliability index may be calculated. Sensitivity Analysis can also be carried out. See the Probabilistic Analysis Overview topic for more information.

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