164 verification problems, 356 reference values

Slope stability analysis you can verify

cSlope is limit equilibrium software for geotechnical engineers. Bishop, Janbu and Morgenstern–Price on circular and non-circular slip surfaces, with water, loads, reinforcement and probabilistic analysis. Every release is checked against 164 published problems.

Download for Windows Read the documentation

Free and open source under the MIT licence.

The cSlope window: the critical slip surface of a homogeneous slope with its centre, slices and factor of safety, the models, the ribbon and the summary of the analysis

published verification problems: 164
reference values: 356
limit equilibrium methods: 3
licence, no licence server: MIT

Capabilities

Everything a slope stability review needs

One desktop application for the whole job: model the section, run the search, check the result and produce the report.

Three methods, one model

Bishop simplified, Janbu with the f₀ correction and Morgenstern–Price with constant (Spencer), half-sine, clipped-sine, trapezoidal or user-defined interslice functions.

Circular and non-circular

Search by entry and exit ranges, custom circles and polylines, non-circular optimisation, minimum slip depth and analysis in both slip directions.

Materials

Mohr–Coulomb, undrained, strength increasing with depth or from a datum with a cutoff, anisotropic, spatially varying, lime-cement columns, and high-strength and impenetrable (bedrock) layers.

Water

Piezometric lines per material, ponded water above the ground, water-filled tension cracks and saturated unit weight below the water table.

Reinforcement and loads

Anchors, tiebacks, soil nails, geosynthetics, piles and sheet piles; distributed and line loads; partial factors on strength and loads.

Reporting

Annotated result sheets with templates, slice data plots and export to PDF, PNG, Excel and CSV.

Sensitivity analysis and probabilistic analysis (Taylor series and Monte Carlo) are built in.

All features

Verification

Checked against published solutions

164 problems from the geotechnical literature and from verification manuals of established programs: 54 reference values from the literature, 2 from analytical solutions and 300 from other programs. The tests run them on every change to the code.

Every problem and result

Examples of reference and computed factors of safety
Problem	Reference	cSlope
Fredlund & Krahn (1977), dry Bishop simplified · Fredlund & Krahn	2.080	2.076
Duncan & Wright fig. 14.3, undrained clay Spencer (M-P, constant f(x)) · Duncan & Wright (reference)	1.124	1.132
Griffiths & Lane example 2, slope with a foundation layer Spencer (M-P, constant f(x)) · Griffiths & Lane (FE)	1.400	1.366

The application

Built for daily engineering work

Edit view: a non-homogeneous slope with coloured material regions — Material regions of a non-homogeneous slope

Result view: every analysed slip surface coloured by its factor of safety — Every analysed surface, coloured by factor of safety

Edit view: Arai and Tagyo's slope with a weak layer between a stronger upper layer and a strong base — Slope with a weak layer (Arai & Tagyo, 1985)

Result view: the optimised non-circular slip surface of Arai and Tagyo's slope, running along its weak layer — Non-circular surface along the weak layer

Open source

Yours to inspect, run and keep

cSlope is MIT licensed. There is no licence server, no subscription and no lock-in: install it on every machine in the office, read the solver code behind any result, and keep the version your project was approved with.

Transparent
The solvers, the search and every verification problem are in the public repository.
Reproducible
Deterministic solvers and a plain JSON project file: the same model gives the same answer.
Maintained
Developed by Ibirico, with automated tests and verification on every change.

Try it on your next section

Install cSlope on Windows and open one of the built-in benchmark models from Help > Benchmarks to see a complete analysis in a minute.

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