MobiSlope

MobiSlope is an app designed for the iPad to calculate the factor of safety of earth slopes, supporting commonly used methods of limit equilibrium slope stability analysis.

MobiSlope is a fully-featured application, with the capability to:
- Model complex geometries with an unlimited number of regions and materials.
- Model complex pore pressure conditions for each region, through the use of piezometric surfaces, and ru or B-bar coefficients.
- Model partially and fully submerged slopes.
- Model tension cracks.
- Model anisotropic materials.
- Model reinforcements loads from anchors, piles, and geosynthetics.
- Model vertical and inclined surcharge and point loads.
- Model seismic loading, input as a horizontal acceleration for pseudo-static analysis.
- Calculate the factor of safety using the Ordinary, Bishop's Simplified, Janbu's Simplified, Spencer's and General Limit Equilibrium methods.
- Calculate probabilistic distributions of factor of safety with user-defined statistical distributions (Normal, Log-Normal, Uniform) of model parameters.
- Analyze circular, compound, and user-defined slip shapes.
- Search for the minimum factor safety using search grid, specified surface, auto search, and optimization techniques.
- Create multiple stages within the same drawing file to analyze different geometry, material, and analysis sensitivities.
- Plot contours of factor of safety for search grids, or display a "heat map" of colors.
- Animate the slip surfaces and slices being analyzed as calculations progress.
- Inspect the calculated slice forces and create custom plots of force and stress over the slip segment.
- Import DXF files for quick creation of slope geometry.
- Create reports (HTML/PDF) using staged results and custom plot content.

MobiSlope is free to download, with in-app subscription purchases available.

A basic subscription costs $19.99 USD / month, or $199.99 USD / year, and allows an unlimited number of drawings, along with analysis results and settings, to be saved. If you choose not to renew your subscription, you will still have access to your previously saved files. Subscriptions renew automatically until cancelled.

For information on our privacy policy, please visit mobislope.com/privacy

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Optimization
The optimization technique implemented in MacSlope is based on that proposed by Greco (1996), and provides an efficient algorithm to search for a more critical FOS using a monte carlo process.
Additionally, a Random Optimization search type has been implemented that generates random slip surfaces and then optimizes each trial slip surface using the optimization procedure.

Probabilistic and Sensitivity Analysis
Carry out probabilistic and sensitivity analysis by modelling material and reinforcement parameters as random variables. Material parameters include unit weight, cohesion, friction, ru, B-bar, and the strength with depth and anisotropic parameters. Reinforcement parameters include tensile, shear, and pullout resistance parameters, spacing, bond length, and area coverage. Random variables can modelled using the normal, log-normal, and uniform distributions.
Calculate the probability of failure (P (F < 1) and create plots of FOS Probability Distribution, Random Variable Distributions, and FOS Sensitivity. Visualize plots of the statistical distributions as you create them.

Material Anisotropy
Support for anisotropic materials has been added. Either specify Anisotropic Ranges as strength parameters defined over specific ranges of slice base angles, or implement the transverse isotropic model.

UI
Piezometric and Specified Surfaces - Redesign of input and detection to allow easier management of multiple surfaces.
Management of point geometry in side panes.