Diapositiva 1

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Geotechnical module capabilities

• Geotechnical properties library for soils and
  rocks
• Superficial Foundations
• Deep Foundations
• Retaining wall generation and design (Sheet
  Piles)
• Underground structures (tunnels)
• Slope stability analysis
• Seepage analysis
• Integration with FLAC3D (available in CivilFEM
  INTRO)
• Other Capabilities

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Soils and Rock Library

• Library with mechanical, elastic and plastic
  properties of typical soils and rocks (around
  100)
• Definition and use of properties not considered
  by ANSYS (Atterberg limits, Hoek Brown
  coefficients, etc.)
• Correlations among geotechnical parameters from
  tests or analysis (elasticity modulus versus SPT,
  etc.)

Soil classification according to Casagrandes
Unified Classification System
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Soils and Rock Library
Properties used in a structural analysis with
Ansys.

• The user can modify any material property

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Soils and Rock Library
Most common correlations among properties.
CivilFEM database of correlations. Users can also
define their own correlations!
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Superficial Foundations

• Footing and continuous foundations
• - 2D/3D soil-structure interaction models

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Superficial Foundations

• Slab Foundations
• - 3D soil-structure interaction models
• - 3D Soil foundation stiffness models with
  calculation of precise, average, maximum and
  minimum values

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Layered Soil Generation

• Automatic generation of equivalent geometrical
  models of layered soils.

Utility Ballast module calculation and
retaining walls.
It takes into account the influence of water level
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Definition of each layer property
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Reinforced Soil

• This reinforcement can be used to simulate
• Sheet or grid reinforcement
• Strip reinforcement
• Soil Nails
• Reinforced slopes or Reinforced Soil walls

CivilFEM will also help to design the
reinforcement needed, by calculating if the
maximum strength is reached or not. The common
wedge sliding surface (more appropriate for this
type of models) can be defined, although the
generic polygonal or circular sliding surfaces
are also available.
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Soil Foundation Stiffness

• Obtaining the theoretical value of the the soil
  foundation stiffness, by means of the Winkler
  model, according to the foundation geometry and
  earth properties.

It allows obtaining the theoretical value of the
ballast module for any foundation or earth
configuration (including those with stratum).
Ballast module distribution at each foundation
point
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Soil Foundation Stiffness
The soil foundation stiffness distribution for
different configurations of foundations
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Soil Foundation Stiffness

• The earth layers may be generated using the
  capability of soil generation.
• The soil foundation stiffness (ballast module)
  value allows approximating the soil elastic
  behavior (E, ?). Its use avoids the necessity of
  modeling the earth underneath the structure.
• Furthermore, it may be obtained not only the
  precise value for each point but also the
  average, maximum and minimum values of the module
  throughout foundation.
• The soil foundation stiffness values calculated
  by CivilFEM are automatically send to ANSYS for
  the following superstructure calculations with
  beams shells or solid elements.

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Deep Foundations

• Pile Cap Wizard
• - Automatic generation of rectangular,
  polygonal or circular pile groups

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Deep Foundations

• Pile Cap Wizard
• - Pre-Design of the Pile length

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Deep Foundations

• Pile Cap Wizard
• - Automatic calculation of the reinforcement
  amount required according to the selected
  code (punching, primary and secondary
  reinforcement of both sides
• for rigid and non-rigid pile
  caps)

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Deep Foundation

• Pile Wailing Load Test

Load Test Reinforcement Design
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Retaining Wall Calculation

• CivilFEM performs retaining wall calculation
  using non-linear and evolving finite element
  models considering the changing with excavation
  level

It takes into account the soil-structure
interaction using non-linear springs with
contact elements
The wall may be considered as a non-linear
structure and analyzed by the non-linear module
of CivilFEM
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Retaining Wall Calculation

• Calculation of Sheet Piles 2D (automatic wizard)
  -3D
• - Non-linear construction sequence analysis
• - One or two sheet piles can be analysed
  simultaneously taking into account anchors,
  water level, layered soils, applied loads.

The excavation or backfilling process can be
visualized in each calculation step.
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Retaining Wall Calculation

• Calculation of Sheet Piles 2D (automatic wizard)
  -3D
• - With any ANSYS and CivilFEM cross section
• - Interaction with other structures

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Retaining Wall Calculation

• The systems generated may consist of one or two
  screens that can be integrated inside other ANSYS
  models like a subset.
• The model is solved by means of an evolving
  calculation, where each calculation stage
  represents a step in excavation or backfill.
• The reinforcement of the retaining walls can be
  later designed by CivilFEM.
• With any ANSYS and CivilFEMcross section

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Earth Pressures
Automatic earth pressures on FE Models

• Dry and flooded earth

• Active, Passive and at rest pressures
• Pressures due to the earth weight and overload
• Earth pressure for beam, shell or solid elements

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Underground Structures (Tunnels)

• Terrain Initial Stress
• Hoek Brown Failure Criteria (rocks)
• Plastic Constitutive models 2D/3D Drucker-Prager
  and 2D Mohr-Coulomb (plain strain)
• Element Birth and Death capability (non-linear
  construction sequence analysis)

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Tunnels (Terrain Initial Stress)

• The program automatically calculates the initial
  stress state from the given topography and soil
  parameters. The initial stresses are stored in an
  ASCII file

The created initial stress file is automatically
introduced into the model using the ISFILE
command of ANSYS
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Hoek-Brown Failure Criteria

• Hoek Brown parameters must be defined to
  perform the analysis according to Hoek Brown.
• They can be all modified by the user.
• CivilFEM uses its own calculation routine to
  simulate the behavior of rock foundations
  following Hoek Brown criteria.

Only for rocks
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Hoek-Brown Failure Criteria
Example of Hoek-Brown failure criteria of a
cylindrical hole
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Underground Structures (Tunnels)

• Element Birth and Death capability (non-linear
  construction sequence analysis)

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Underground Structures (Tunnels)

• Plastic Constitutive models 2D/3D Drucker-Prager
  and 2D Mohr-Coulomb (plain strain)

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Slope Stability (Classic Methods/FEM)

• CivilFEM allows to calculate the safety factor
  against sliding phenomena in 2D models defined in
  ANSYS using Fellenius, Bishop, Morgestern-Price,
  U.S. Corps of Engineers or Janbu methods.
• The user may also solve the model by finite
  elements and compute the factor of safety.

Grid of centers defined by the user.
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Slope Stability (Classic Methods/FEM)

• Very easy and intuitive way of defining the
  slope, circles, polygons, water pressures lines,
  seismic action and so on.

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Slope Stability

• With just one calculation, its possible to
  visualize the results according to the different
  available methods.

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Seepage Analysis

• Calculating hydraulic heads and pore water
  pressures
• Obtaining the saturation line for 2D problems
• Exporting the obtained pore water pressure for
  slope stability analysis. The finite element mesh
  used in the two analyses can be different

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Seepage Analysis
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Integration with FLAC3D
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Some Other Capabilities

• Automatic Load Stepping to select suitable load
  increments
• Large strains calculations to perform significant
  changes in the geometry
• Plastic Constitutive models 2D/3D Drucker-Prager
  and 2D Mohr Coulomb (plain strain),
  viscoplasticity, viscoelasticity, anisotropic
  plasticity, etc.
• Safety factors defined as the ratio of the
  failure load to working load.
• Powerful Post-processor deformation, stresses,
  forces, reinforcement amounts, etc
• 2D/3D Dynamic compaction, using the cycling loads
  
• Improvement of soils Birth and Death of elements
  features for jet grouting, gravel column.