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Intel software, Wolfram Mathematica, Origin, Statgraphics, EViews
Intel software, Wolfram Mathematica, Origin, Statgraphics, EViews
Info e Commerciali Intel software, Wolfram Mathematica, Origin, Statgraphics, EViews
SLOPE/W 2019
Lingua: Ing S.O.: Win
Produttore: GeoSlope


SLOPE/W

 

Slope stability analysis

SLOPE/W is the leading slope stability software for soil and rock slopes. SLOPE/W can effectively analyze both simple and complex problems for a variety of slip surface shapes, pore-water pressure conditions, soil properties, and loading conditions.

With this comprehensive range of features, SLOPE/W can be used to analyze almost any slope stability problem you will encounter in your geotechnical, civil, and mining engineering projects.

Key Features

Pore-Water Pressure

Pore-water pressures can be defined using piezometric lines, spatial functions, or the results from other GeoStudio finite element analyses. Values can be displayed as contours on the geometry to reveal PWP values used in the analysis.

Rapid Drawdown

Rapid drawdown analysis can be conducted using the pore-water pressures defined using piezometric lines, transient finite element GeoStudio analyses, or the multi-stage rapid drawdown technique.

Material Models

SLOPE/W supports a comprehensive list of material models including Mohr-Coulomb, undrained, high strength, impenetrable, bilinear, anisotropic strength, SHANSEP, spatial Mohr-Coulomb and more.  

Limit State Design

Limit state design or load resistance factor design is handled by specifying partial factors on permanent/variable loads, seismic coefficients, material properties, reinforcement inputs and more. 

SLOPE/W can model a comprehensive range of stability problems

Download GeoStudio to view GSZ files

Eurocode Design Case

SLOPE/W can be used to complete a stability analysis with the objective being to check an ultimate limit state in accordance with various limit state design approaches such as Eurocode 7, Norwegian Standard NS 3480, and British Standard 8006. The stability analysis is completed with partial factors applied to characteristic loads and soil strength parameters.


Download the GeoStudio data files(1) (2) (3)

Read the analysis details

James Bay Case History

This article looks at the SLOPE/W probabilistic analysis capabilities relative to the James Bay hydroelectric project. It required the construction of fifty kilometers of dykes on soft and sensitive clay. Divergent views were prevalent regarding the selection of safety factors and strength properties. The project has consequently become an important and often-cited case history.

Download the GeoStudio data files
Read the analysis details


Reinforcement with Anchors

The purpose of this illustrative example is to show how anchors can be used to improve the stability of a system. Features of this simulation include: Spencer analysis method, homogenous material using the Mohr Coulomb soil model, a dry slope with no pore-water pressure, two sloping anchors, and the entry and exit slip surface option.

Download the GeoStudio data files
Read the analysis details


Stability of an MSE Wall

Mechanically stabilized earth (MSE) walls are structures for retaining the earth under bridges, highways, and waterfront properties, to name a few. Designing a MSE wall requires consideration of the geometric configuration and reinforcement requirement to ensure both internal and external stability.

Download the GeoStudio data files
Read the analysis details


SLOPE/W's intuitive modeling workflow

Create a SLOPE/W analysis and set up the problem workspace. Choose options for limit equilibrium or finite element stress methods, pore-water pressures, trial slip surfaces, tension cracks, probabilistic and sensitivity methods, pseudo-static loading, partial factors, convergence criteria, and more.


 

Create a SLOPE/W analysis, and then draw the regions in your domain using CAD-like drawing tools, including drawing polygon and circular regions, coordinate import, copy-paste geometric items, length and angle feedback, region splitting and merging, and direct keyboard entry of coordinates, lengths, and angles. Alternatively, import AutoCAD DWG or DXF files directly into GeoStudio to create your domain geometry. 


Define the material properties for your analysis, assign them to regions on the domain, and then define your initial pore-water conditions. Select from a comprehensive list of soil and rock material models including Mohr-Coulomb, undrained, high strength, impenetrable, bilinear, strength as a function of depth, anisotropic strength, generalized shear-normal function, SHANSEP, and generalized shear-normal function (for typical rock material models including Hoek-Brown). Define the pore-water pressure conditions as either piezometric lines, spatial functions, finite element computed, or Ru and B-bar approaches.


Define slope reinforcement properties to simulate ground anchors, soil nails, piles, or geosynthetics. Define surcharge loads to simulate a pressure applied over a portion of the ground surface, such as a footing. Any other loads can be modeled on the domain as a point load. You can also specify seismic loading on the domain by setting horizontal and vertical coefficients that represent a force created by seismic or earthquake accelerations. 


Define a set of trial slip surfaces that SLOPE/W will use for computing a critical factor of safety. A number of options for specifying slip surfaces are available, including as entry and exit zones along the ground surface, a grid of slip surface centers and radius tangents, blocks of slip surface intersection points, or pre-defined slip surface line segments.

When your problem is completely defined, start the analysis process in the Solver Manager window. Once the Solver is running, multiple slip surfaces are solved in parallel, allowing for faster performance. The Solver Manager displays the solution progress, allowing you to cancel or stop/restart if necessary. While the solution is in progress, you can look at preliminary results in the Results window.

When the Solver is finished, the critical slip surface is displayed, along with the critical factor of safety. Use a slip surface color map to visualize the variability in factor of safety with slip surface position. You can filter the slip surfaces displayed to a specific factor of safety range.

Interactively select any analyzed slip surface to graphically display the forces on any slice or information about the sliding mass. Display plots of computed results over the slip surface, such as various strength or convergence parameters along each slice. Generate reports of the definition and results, and export into other applications such as Microsoft Excel for further analysis.

 

Complete Feature List
 

Integrated into the GeoStudio Suite

SLOPE/W is integrated into the GeoStudio suite, and therefore has access to the GeoStudio features for creating your model, analyzing it, and viewing results.


Comprehensive Formulation

SLOPE/W computes the factor of safety of earth and rock slopes. SLOPE/W can effectively analyze both simple and complex problems for a variety of slip surface shapes, pore-water pressure conditions, soil properties, analysis methods and loading conditions. Using limit equilibrium, SLOPE/W can model heterogeneous soil types, complex stratigraphic and slip surface geometry, and variable pore-water pressure conditions using a large selection of soil models. Analyses can be performed using deterministic or probabilistic input parameters. Stresses computed by a finite element stress analysis may be used in addition to the limit equilibrium computations for the most complete slope stability analysis available. With this comprehensive range of features, SLOPE/W can be used to analyze almost any slope stability problem you will encounter in your geotechnical, civil, and mining engineering projects.


Typical Applications

SLOPE/W can model almost any stability problem, including:

  • Natural soil and rock slopes
  • Construction excavations
  • Earthen dams and levees
  • Open-pit highwalls
  • Reinforced earth structures
  • Slope stabilization design
  • Slopes with surcharge or seismic loading
  • Dam stability during rapid drawdown
  • Partially and totally submerged slopes
  • Unsaturated slopes subjected to infiltration
  • Tailings dam stability

A Choice of Many Analysis Methods

SLOPE/W is formulated in terms of moment and force equilibrium factor of safety equations, and supports a comprehensive list of limit equilibrium methods including Morgenstern-Price, Spencer, Bishop, Janbu, and the Ordinary method. The Morgenstern-Price method, for example, satisfies both force and moment equilibrium. This general formulation makes it easy to compute the factor of safety for a variety of methods and to readily understand the relationships and differences among all the methods.

SLOPE/W can also perform finite element stress-based stability and dynamic stability analyses. It uses finite element computed stresses from either SIGMA/W or QUAKE/W to calculate a stability factor by computing both total shear resistance and mobilized shear stress along the entire slip surface. SLOPE/W then computes a local stability factor for each slice.


Multiple Slip Surface Search Techniques

SLOPE/W offers a variety of techniques to search for the critical slip surface. You can define potential slip surfaces by a grid of centers and radius lines, blocks of slip surface points, entry and exit ranges, or fully specified shapes. This provides the flexibility to handle various modes of failure such as rotational, translational, composite, retrogressive, and structure-controlled failures.


Rigorous Solution Algorithm

SLOPE/W employs a rigorous solution algorithm to cope with highly non-linear problems with difficult convergence. Graphical display of the Factor of Safety vs Lambda plot allows the user to visually inspect the acceptability of convergence.


Comprehensive Pore-Water Pressure Definition

Pore-water pressures can be defined using piezometric lines, spatial functions, or using the results from other GeoStudio finite element analyses such as SEEP/W or SIGMA/W. SLOPE/W also accommodates the B-bar and Ru approaches. The defined pore-water pressure values can be displayed as contours on the geometry to help you see the PWP values that will be used in the analysis.


Rapid Drawdown Analysis

Rapid drawdown analysis can be conducted using the pore-water pressures defined using piezometric lines, transient finite element GeoStudio analyses, or the multi-stage rapid drawdown technique. The water surcharge load is automatically calculated in SLOPE/W at every instant in time.


Reinforcement using Anchors, Nails, Piles, and Geo-Synthetics

A variety of slope stabilization options such as anchors, nails, piles, and geo-synthetics are available in SLOPE/W. Reinforcement loads are calculated with consideration given to tensile capacity, anchorage at the slope face, and stripping in the passive zone. Additional options include factor of safety dependency, load distribution, and orientation of the load. Pull-out resistance for geo-synthetics can be specified or calculated from interface adhesion and shear angle.


Soil Material Models

SLOPE/W supports a comprehensive list of soil material models including Mohr-Coulomb, undrained, high strength, impenetrable, bilinear, strength as a function of depth, anisotropic strength, generalized shear-normal function, SHANSEP, spatial Mohr-Coulomb and more.


Rock Material Models

Typical rock material models such as Hoek-Brown, Generalized Hoek-Brown, Barton and Choubey (1977), Miller (1988) can be handled by SLOPE/W using the generalized shear-normal function with or without an anisotropic modifier function.


Transient Stability Analysis

The stability of a slope can be modeled through time with temporal variability in pore-water pressures and/or stresses by integrating SLOPE/W with one of the GeoStudio finite element products.


Limit State Design

Limit state design or load resistance factor design (LRFD) can be handled in SLOPE/W by specifying partial factors on permanent and variable loads, soil unit weight, seismic coefficients and earth resistance, material properties, and reinforcement inputs. In this manner, any design code from around the world can be considered such as Eurocode or the British Standards.


Probabilistic and Sensitivity Analysis

Probabilistic and sensitivity analysis can be conducted on almost any input parameter and using a variety of distributions including normal, log-normal, uniform, triangular, or a generalized function. Spatial correlations are handled via a specified sampling distance. Using a Monte Carlo approach, SLOPE/W computes the probability of failure in addition to the conventional factor of safety.


Pseudo-Static and Newmark Dynamic Stability

Earthquake loading can be modeled using seismic loads with various pore-water pressure conditions, including the Duncan et al. (1990) two-stage undrained strength method, the two-stage effective stress strength method, or even the dynamic pore-water pressures from a QUAKE/W analysis.


Strength Reduction Stability Analysis

SLOPE/W can be integrated with SIGMA/W to perform a strength reduction stability analysis.


Easy Investigation of Slope Geometry

The effect of slope geometry on the calculated factor of safety can easily be analyzed in SLOPE/W by creating multiple analyses in the Analysis Tree and using the Split Region tool.


Fast, Parallel Solving of Slip Surfaces and Analyses

SLOPE/W uses parallel processing to analyze each slip surface independently, allowing for faster solutions on multi-core processors. Multiple analyses are also analyzed in parallel. You can monitor the solution progress in the Solver Manager window.


Results for any Slip Surface

You can interactively select any analyzed slip surface to graphically display the forces on any slice or information about the sliding mass. You can also display plots of computed results over the slip surface, such as various strength or convergence parameters along each slice.


Results on Multiple Slip Surfaces

Multiple slip surfaces can be displayed on the drawing to investigate different modes of failure and to visualize the variability in factor of safety with slip surface position. These results can be displayed using a slip surface color map, a safety map, or as contours within the grid of slip surface centers. This slip surface list can also filtered to aid you in interpreting the results.






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