SoilVision Systems Ltd.

- Slope Stability Analysis Software

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SVSlope represents the new standard in slope stability analysis. Users can perform classic limit equilibrium slope analysis by the method of slices or newer stress-based methods. Advanced searching methods are implemented to correctly determine the correct location of the critical slip surface. SVSlope is characterized by an advanced probability analysis as well as integration with other packages in SVOffice. The streamlined user interface and advanced slip surface searching algorithms make for fast model setup and computation times.

We have put extensive effort into verifying SVSlope against classic case-study scenarios and existing slope stability software packages such as Clara/W. Some original interface concepts were inspired by Clara/W and have been implemented in SVSlope in order to provide continuity of use. The team at SoilVision Systems Ltd. represents an advanced group of geotechnical engineers and software developers with M.Sc. and Ph.D. degrees and decades of experience which ensures that your modeling will be successful and reliable. This allows users to be confident that results from SVSlope are correct.

SVSlope is currently being used on world-class slope stability projects. Top slope stability industry experts already support the use of SVSlope as the new standard in slope stability modeling.

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  • Slope stability analysis in both two and three dimensions
  • Spatial variability of material properties aids in improving the calculation of factors of safety
  • Advanced stochastic analysis such as Monte Carlo, Latin Hypercube, and theAlternative Point Estimation Method (APEM) allow the end-user to determine normal distributions of the factor of safety as well as the probability of failure
  • Coupled unsaturated steady-state or transient seepage analysis is available when coupled with SVFlux™
  • Advanced critical slip surface searching algorithms including dynamic programming and Greco search methods
  • One- or two-way sensitivity analysisallows the generation of a contoured surface of the factor of safety based on the relationship between two input variables
  • New finite element based slope stability methods
  • Simple and powerful user interfaceallows rapid creation of effective models
  • Easily generate 3D models from 2D cross-sections, or slice 3D models into 2D cross-sections
  • 14 different analysis methods including classic method of slices such as Bishop, Janbu, Spencer, Morgenstern-Price, GLE, and others
  • Support for 14 different soil strength models including Mohr-Coulomb, Hoek-Brown, Undrained, Anisotropic, Bilinear, Frictional-Undrained, and four unsaturated shear strength strength models
  • Multiple unsaturated soil strength models allow for more extensive analysis of unsaturated soil conditions
  • Extensive support for reinforced slopes
  • Support for the Hong Kong soil nail equation
  • Representation of dry or wet tension cracks
  • Support for entry of the vertical side shear resistance
  • Extensive QAQC program

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It was a number of years ago that we laid out the design for a slope stability software project. The SVSlope project represents the most ambitious project our company had ever undertaken. The resources and time periods needed for this type of project were daunting. Why do this project?

We have observed significant changes in the research literature on the numerical modeling methodologies being proposed for slope stability analysis in geotechnical engineering and felt that there was need for a software tool that reflected the present and future trend of geotechnical engineering practice.

The SVSlope software provides easier access to statistical methods and allows the linear and nonlinear analysis of unsaturated soil conditions in a slope. The software has implemented cutting edge slope stability analysis methods that are receiving attention in the research literature. This new software tool is implemented on the latest software platforms, has a simple user interface and is supported with extensive help systems and training tools. The concept was to create and release a software package that was more technically advanced and still easier to use than any existing software tools.

In order to develop such a software tool, the technical staff at SoilVision began by assembling a team of technical professionals and experts to guide the development of the new package. The core development team assembled to undertake the software development had received graduate degrees by studying under slope stability experts such as:

  • Yamagami (dynamic programming research)
  • Morgenstern (Morgenstern-Price method; statistical analysis)
  • Fredlund (GLE method; dynamic programming research).

It was important that each member of the development team had experience in both geotechnical engineering as well as major software development experience. The core development team included Tiequn Feng, PhD/PEng, HaiHua Lu, MSc, Murray Fredlund, PhD/PEng, Rob Thode, BSc/PEng, Del Fredlund, PhD/PEng/OC, Gilson Gitirana, PhD/PE, Dirk van Zyl, PhD/PE, and Ward Wilson, PhD/PEng. The combined group provided significant experience from the field of slope stability analysis.

Once the team was assembled, work began by laying out the design concepts and framework. Then the scheduling of the project was laid out. As in any large project, the only certainty was that there be ongoing change. Given the size of the project and the number of different software technologies available there was a significant amount of trial and error in order to obtain the desired final product.

Proper documentation of the software was a priority. The documentation was divided separately into a user’s manual, a tutorial manual, a verification manual, and a theory manual. Software for document versioning and maintenance and delivery of the core documents was reviewed and a system for delivering suitable help assistance on a variety of formats was established.

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Verification of the software package was considered of paramount importance and a great deal of time was extended comparing SVSlope results to published benchmarks and other slope stability software packages. A great deal of lively discussion ensued internally and with our external review board of experts regarding the proper quantification of a “right” answer! During re-visitation and programming of classic limit equilibrium method of slices it was both informative to track the application of these methodologies to various classes of models.

In all, more than 100 benchmark example models have been set up, solved, and documented in our verification manual. These benchmark example models are all solved to required tolerance limits prior to the release of any particular version of the software.

Once the software was prototyped, it was also considered important to put the software into hands of consultants with significant slope stability modeling experience where the product could be subjected to critical testing and examination. The “Beta” version version has performed well. The release date of the project has been pushed back a number of times in order to make all necessary adjustments and corrections have been implemented to ensure seamless performance of the software.

We are pleased to introduce you to SVSlope, a new standard in slope stability analysis.  It is the culmination of years of work, thousands of man-hours and the most extensive review and verification program ever executed by our company. The software has already been applied to world-class slope stability projects.

SVSlope is intended to provide geotechnical consultants with a comprehensive slope stability package that pays special attention to recent advances in the analysis of natural and man-made slope. We feel that this product implements a balance of leading edge technologies as well as classic slope stability methods and will provide added value to geotechnical engineering consultants. We welcome you to use the results of our hard work!

  • Multi-Directional Slip Analysis added to SVSlope 3D Elite (02/2013)
  • New British Standards supported: BS8006-1:2010 Code of practice for strengthened/reinforced soils and other fills and BS8006-2:2011 Code of practice for strengthened/reinforced soils. Soil nail design
  • Added Anisotropic Linear Model (ALM1) and Modified Anisotropic Linear Model (ALM2) analysis methods(12/2012)
  • Classroom Edition (01/2012)
  • User can now specify vertical side shear resistance in SVSlope 3D (07/2011)
  • It is now possible to assign materials from SVSlope 3D cross-sectional view (07/2011)
  • The aspect ratio of the searching ellipsoid can now be varied as an input parameter in SVSlope 3D (06/2011)
  • Changing the slope limits in a 3D analysis now updates the column display dynamically (06/2011)
  • New kinematic admissibility rules added to dynamic programming. This method now works with the Janbu method of slices (05/2011)
  • Eurocode 7 support added (04/2011)
  • Mohr-Coulomb - Curved surface envelope material model added (04/2011)
  • 3D Models may be cut into 2D models at any arbitrary vertical plane (04/2011)
  • New XZ, YZ profile views to visualize SVSlope 3D models and results (01/2011)
  • Many SVSlope 3D objects can be manipulated in XZ and YZ profile views: wedges, moving wedges, search parameters, and much more! (01/2011)
  • SVSlope most critical center is now displayed in both 2D and 3D (01/2011)
  • All 3D critical slip surfaces can be viewed and filtered in XZ and YZ profile views, similar to SVSlope 2D (01/2011)
  • Display of trial ellipsoids slip surfaces can now be displayed on the 2D cross-sectional views in the back end of the software (12/2010)
  • Critical slip surface ellipsoid properties in 3D can be edited by double-clicking on the graphical object on screen (12/2010)
  • Wedge properties in 3D may be edited by double-clicking on the object (12/2010)
  • Moving wedges now fully supported in 3D (12/2010)
  • Wedge center of rotation is now displayed on the canvas as a sphere or ball in the backend. This can also be hidden or shown with an option on the critical sliding mass dialog (12/2010)
  • Column base contouring in 2D plan view of any primary solution variable along the critical slip surface can now be done (12/2010)
  • New features common to all SVOffice™ 2009 products click here to go to the SVOffice™ feature page
  • Additional features are listed below

  • CAD style entry of geometry based on AutoCAD
  • Grid, snapping, and object snapping features available
  • Zooming, panning features available
  • Models stored in XML format for speed and easy data transfer
  • Each surface may have multiple regions defined - Regions are extruded between the surfaces on which they are placed
  • Import AutoCAD .dxf geometry and incorporate it directly into the model - node points are automatically aligned with line segment end points
  • Problems may be entered in Metric or Imperial units
  • Initial water table may be graphically drawn on the problem or imported from SVFlux as pore-water pressure data
  • A central database of soil properties for all entered slope stability problems is maintained; new problems may draw soils from existing problems.
  • Problem geometry may be imported from existing problems
  • Colors or patterns of soil regions may be specified
  • Manual entry of region coordinate points
  • Sketch text or lines may be added to the model design
  • Graphical model design may be exported as a WMF or DXF file and/or printed
  • Bitmap or DXF geometry may be imported and layered behind model geometry to simplify model creation

  • Color visualization of the critical slip surface is available via our powerful AcuMesh visualization software
  • Color contour plots of any problem variable may be placed on any face of the model; custom color shadings may be specified
  • Color contour plots of all relevant variables
  • Plots may be zoomed to isolate any region of interest
  • Plots of value versus time may be generated at any coordinate for all relevant variables
  • Text and line art may be added to output
  • Graphical output may be exported to WMF, DXF, JPG, or BMP formats
  • Animation of any transient results

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