STEDwin is the Windows version of STED (short for STabl EDitor), the smart editor for all the STABL programs. STEDwin itself performs no stability analysis but creates data files in the format expected by STABL and prepares high-quality graphics from the output. This allows you to concentrate on the engineering aspects of slope stability analysis.
• STEDwin supports PCSTABL versions 4, 4M, 5, 5M from Purdue University, STABL6H, and PennDOT's PASTABLM.EXE and PASTABLE.EXE programs. STEDwin also supports Purdue University's PCSTABL6 program with soil nailing and improved geosynthetic analysis capability. Full support is also now provided for the new PCSTABL7 program (DOS version) recently released by Purdue University (be sure to indicate on the order form whether you have the new PCSTABL7).
• Easy-to-learn Windows interface gets you up and running quickly and increases your productivity.
• Prints full-page, report quality color graphics to any Windows printer. A small graphic logo (.BMP, .JPG, or .TIFF file) can be included on the plots.
• STEDwin runs under Windows 98, NT, 2000, Me, XP, Vista, and now Windows 7 (32- and 64-bit)
GRAPHICS
• STEDwin produces high quality screen graphics from the STABL output and plotfiles.
• Full-page, report quality graphics can be printed on any Windows printer or exported as ".BMP" and AutoCAD "DXF" files.
• Text is automatically printed on the plots to show which method was used to calculate the reported factors of safety--i.e., "Factors of Safety are Calculated by the Modified Bishop Method."
• Any of the individual surfaces on the plot of the "10 most critical surfaces" graph may be selected for printing.
• The initiation and termination limits for search-type analyses are shown on the plots to help interpret analysis technique.
• Text labels (up to eight characters for each soil type) can be entered in the soil properties table included on plots.
DATA ENTRY
• Simple, spreadsheet-like data entry and modification makes STED extremely easy to learn and use.
• Considerable error checking and documentation of STABL error codes is provided. There is no need to track down a copy of the manual to look up cryptic error codes!
• Soil boundary lines, piezometric surfaces, and surface boundary loads can be inserted and deleted.
• STED can use real world coordinates, especially real elevations! No longer are you restricted to the STABL constraints that the geometry have an origin at (0,0) and that all coordinates be positive values. This is accomplished by a "user specified origin" value which is subtracted from all (x,y) coordinate pairs when the file is saved to disk.
• STABL will not generate surfaces with negative coordinates. Thus, a problem that is inadvertently set up too closely to the axes will incorrectly result in a truncated region where potential critical surfaces may exist but not be evaluated. Without STEDwin, you would need to re-draw the cross section and re-enter all of the coordinate data. With STEDwin, however, you can easily enter one or two values to shift the problem geometry away from the axes.
• Anisotropic soil parameters are entered using a unique system which allows ANISO data to be entered in any order. To help visualize complex data, a plot of the angular ranges can be created at any time.
• A geometry preview feature allows you to view the input data before running STABL. This reduces the chance that STABL will abort due to input errors.
GEOGRID DESIGN
• A GeoGrid Design screen simplifies entry of reinforcing layers. This allows you to easily define up to 40 horizontal reinforcing layers by specifying the geogrid length, vertical spacing and strength properties for one or two types of reinforcing grids. STED uses the design information to generate data in the format expected by STABL. If desired, the data can then be manually edited.
METRIC UNITS
• STED can convert all data between English and Metric units with a single click of the mouse. This allows you to enter data in English units and then easily convert to Metric units to satisfy regulatory agency requirements as needed.
I . INTRODUCTION
PASTABLM is a program written in FORTRAN and calculates the
factor of safety against slope failure using a two-dimensional
limiting equilibrium method . The calculation of the factor of
safety against . slope instability is performed using either the
Simplified Bishop method of slices, which is applicable to
circular shaped failure surfaces, the Simplified Janbu method of
slices, which is applicable to failure surfaces of a general
shape, or Spencer method of slices which is applicable to
surfaces having a circular or general shape .
PASTABLM features unique random generation of potential failure
surfaces for subsequent determination of the more critical
failure surfaces and their corresponding factors of safety .
Circular, irregular and sliding block surfaces may be generated
and analyzed using either a random search technique or specific
input of the coordinates of a given potential failure surface .
The program is capable of handling heterogeneous soil profiles,
anisotropic soil strength parameters, excess pore water pressure
due to shear, static groundwater and surface water, pseudo-static
earthquake loading, surcharge and tieback loading, and reinforced
slopes .
The tieback loading feature provides for the input of horizontal
or inclined tieback or line loads for analyzing the overall
stability of tied-back or braced slopes and retaining walls .
PASTABLM has the ability to analyze slopes subjected to tieback
or concentrated loads using the Simplified Janbu, Simplified
Bishop or the Spencer methods of slices .
The reinforcing layer option provides for the input of layer
locations and lengths, the distribution of available force, and
the direction in which the force acts . The circular trial
surface may be specified or PASTABLM's surface generation routine
may be used .
INPUT DATA
a. Profile Boundaries
b. Piezometric Surfac
c. Soil Parameters
d. Boundary Loads
e. Earthquake Loading
f. Tieback Loading
g Reinforcing Layers
h Failure Surfaces
i Failure Surfaces 'Spencer's Method'
