This program carries out the analysis of soil or rock slope stability both in static and seismic states utilizing the limit equilibrium methods of Fellenius, Bishop, Janbu, Bell, Sarma, Spencer, Morgenstern & Price and Discrete elements method (DEM) for circular and non circular surfaces by which it is possible to ascertain slippages in the slope, examine a gradual failure, and employ various models of force-deformation relationship. Reinforcements with piles, gravity and/or reinforced concrete bracing walls, nettings, geofabrics, anchors, and terracing may be specified. Distributed and point loads may be defined.
Optional modules:
Dynamic Analysis: Numerical method for the analysis of slope stability under
seismic conditions for direct integration and modal superposition using
Newmark's method (1965). It allows the computation of
permanent displacements of landslide mass by integrating the relative
acceleration. It is also possible to generate the artificial accelerograms or
import accelerograms from: SIMQKE and Sabetta F., Pugliese A.: Estimation of
Response Spectra and Simulation of Nonstationary Earthquake Ground
Motions.
Slope 3D: Generation of digital 3D models from GIS, DXF or Text files.
Import of files from SRTM
(SRTM is a software created by GEOSTRU, included in the
GEOAPP free suite,
which allows the generation of a 3D model by simply selecting an area on Google
Maps). The sections to be analyzed with Slope are automatically created in a
dynamic way by moving on the 3D model.
DEM - Discrete Element Method:
Advanced numerical method for the analysis of slope stability in static and
dynamic conditions. Very sofisticated model of computation of linear and
nonlinear analysis based on the behavior of the ductile or fragile soil.
M.R.E. (Mechanically reinforced earth): Design and verification of
reinforced soil retaining structures. Are carried out verification at: pullout
and break for bar or strips reinforcements and geosynthetics, local stability
(Tieback), global stability (Compound), sliding verifications of a rigid body,
limit load, overturning. Provided standards: NTC2008, GRI (Geosynthetic Research
Institute), BS8006/1995 (Code of practice for strengthened/reinforced soils and
other fills), FHWA (Federal Highway Administration).
Supported computation standards
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The general limit equilibrium method (GLE); |
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Norme tecniche costruzioni (NTC 2008); |
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Eurocode 7/8; |
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British Codes BS8004. |
DATA INPUT
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Graphic input with mouse; |
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Tabular numeric input; |
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Input from EXCEL files; |
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Input from DXF files; |
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Input of topographic profile generated by TRISPACE; |
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Import of rasterized images; |
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Input of ASCII files; |
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Input from Dynamic Probing. |
EMBANKMENT LOAD TYPES
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Point loads (inclined); |
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Longitudinal loads. |
REINFORCEMENTS AND INTERVENTION WORKS
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Retaining walls; |
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Single piles, Sheet pile walls or Bulkheads:
Stabilization method: Broms limit load with automatic computation of the
breaking moment of the section, Shear strength method, Zeng Liang's method; |
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Gabions; |
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Active and passive anchors; |
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Step terracing; |
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Reinforced earth: bars, strips and geotextile sheets; |
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Geogrids database that cand be modified by the user; |
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Drained trenches; |
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Input of generic works; |
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Integrated template for the automatic generation of
Wind turbines and telephone towers; |
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Nailed reinforcement implementation using
Soil Nailing technique. |
COMPUTATION METHODS
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FELLENIUS (1936); |
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BISHOP (1955); |
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JANBU (1956); |
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MORGENSTERN and PRICE (1965); |
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SPENCER (1967); |
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BELL (1968); |
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SARMA (1973); |
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D.E.M. (1992); |
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ZENG LIANG (1995); |
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Back Analysis; |
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Rock slope analysis using the Hoek and Brown method (1980). |
NEUTRAL PRESSURES INCREMENT IN SEISMIC FIELD
In case of seism is estimated the increment of the neutral pressures
produced by the deformations induced by the seismic waves. The formulas used
are: Matsui et al., 1980, Seed & Booker, 1997, Matasovic,1993.
All the parameters necessary for the estimate such as Arias index, Trifunac duration, etc. are calculated automatically by the programme upon integration of the design accelerogram.
COMPUTATION OPTIONS
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Recalculate function to evaluate the safety factor of a specific surface with center X0,Y0 and radius R; |
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Identification of the critical slide surface though automatic calculation; |
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Computation of safety factor for surfaces which pass through two given points and are tangential to a straight line whose gradient varies automatically; |
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Automatic computation of safety factor for surfaces that are tangential to a straight line vector; |
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Computation of safety factor for surfaces which pass through either three, or one given point; |
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Differentiation between flexible and rigid retaining structures; |
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Stability analysis of submerged slopes (e.g. hillside lakes); |
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Analysis of irregular surfaces; |
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Presence of seismicity and aquifers; |
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Stratified terrains and relative pore pressures. |
GRAFIC OPTIONS
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Display of the safety factor isolines; |
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Colored display of all sliding surfaces divided by safety factor (to
each color are assigned the safety factors in a fixed interval); |
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Selection of the surfaces to be printed; |
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Otions <Delete mesh>, <Move mesh> and numerical assignment of the
centeres' mesh; |
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Option <Translate groundwater> which allows to raise or lower the
water tabel (very useful command for the sensivity of the Fs when the
goundwater level varies); |
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Layer filling with textures or colors (the textures can be defined
by the user); |
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Graphical and numerical input for non-circular sliding surfaces; |
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Tools for inserting text, lines and polygons on the graphic sheet. |