geotechnical_civilfem
TRANSCRIPT
![Page 1: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/1.jpg)
ANSYS, Inc. Proprietary© 2004 ANSYS, Inc.© 2004 ANSYS, Inc.
SYS C ivilFEM
![Page 2: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/2.jpg)
SYS C ivilFEMGeotechnical 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
![Page 3: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/3.jpg)
SYS C ivilFEMSoils and Rock Library
Soil classification according to Casagrande’s “Unified
Classification System”
• 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.)
![Page 4: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/4.jpg)
SYS C ivilFEMSoils and Rock Library
• The user can modify any material property Properties used in a structural analysis
with Ansys.
![Page 5: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/5.jpg)
SYS C ivilFEMSoils and Rock Library
Most common correlations
among properties.
CivilFEM database of correlations. Users can
also define their own correlations!
![Page 6: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/6.jpg)
SYS C ivilFEMSuperficial Foundations
• Footing and continuous foundations:- 2D/3D soil-structure interaction models
![Page 7: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/7.jpg)
SYS C ivilFEMSuperficial Foundations
• Slab Foundations:- 3D soil-structure interaction models - 3D Soil foundation stiffness models with
calculation of precise, average, maximum and minimum values
![Page 8: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/8.jpg)
SYS C ivilFEMLayered Soil Generation
• Automatic generation of equivalent geometrical models of layered soils.
It takes into account the influence of water level
Definition of each layer property
Utility: Ballast module calculation and retaining walls.
Wh
![Page 9: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/9.jpg)
SYS C ivilFEMReinforced 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.
![Page 10: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/10.jpg)
SYS C ivilFEMSoil 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.
Ballast module distribution at each
foundation point
It allows obtaining the theoretical value of the ballast module for any foundation or earth configuration
(including those with stratum).
![Page 11: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/11.jpg)
SYS C ivilFEMSoil Foundation Stiffness
The soil foundation stiffness distribution for different configurations of foundations
![Page 12: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/12.jpg)
SYS C ivilFEMSoil 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.
![Page 13: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/13.jpg)
SYS C ivilFEMDeep Foundations
• Pile Cap Wizard: - Automatic generation of rectangular, polygonal or circular pile groups
![Page 14: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/14.jpg)
SYS C ivilFEMDeep Foundations
• Pile Cap Wizard: - Pre-Design of the Pile length
![Page 15: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/15.jpg)
SYS C ivilFEMDeep 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)
![Page 16: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/16.jpg)
SYS C ivilFEMDeep Foundation
Pile Wailing Load Test Load Test Reinforcement Design
![Page 17: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/17.jpg)
SYS C ivilFEMRetaining 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
![Page 18: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/18.jpg)
SYS C ivilFEMRetaining 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.
![Page 19: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/19.jpg)
SYS C ivilFEMRetaining Wall Calculation
• Calculation of Sheet Piles 2D (automatic wizard) -3D - With any ANSYS and CivilFEM cross section- Interaction with other structures
![Page 20: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/20.jpg)
SYS C ivilFEMRetaining 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
![Page 21: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/21.jpg)
SYS C ivilFEM·Earth Pressures
• 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
Automatic earth pressures on FE Models:
1
X
Y
Z
1
X
Y
Z
![Page 22: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/22.jpg)
SYS C ivilFEMUnderground 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)
![Page 23: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/23.jpg)
SYS C ivilFEMTunnels (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
H
H
V
The created initial stress file is
automatically introduced into the
model using the ISFILE command
of ANSYS
![Page 24: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/24.jpg)
SYS C ivilFEMHoek-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
![Page 25: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/25.jpg)
SYS C ivilFEMHoek-Brown Failure Criteria
Example of Hoek-Brown failure criteria of a cylindrical hole
![Page 26: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/26.jpg)
SYS C ivilFEMUnderground Structures (Tunnels)
• Element Birth and Death capability (non-linear construction sequence analysis)
![Page 27: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/27.jpg)
SYS C ivilFEMUnderground Structures (Tunnels)
• Plastic Constitutive models: 2D/3D Drucker-Prager and 2D Mohr-Coulomb (plain strain)
![Page 28: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/28.jpg)
SYS C ivilFEMSlope Stability (Classic Methods/FEM)
Generación de fam ilias de poligonales
x1
y12
y11
x2
y22
y21
x5
y52
y51
Polygonal for Janbu Method
R
(x ,y )o o(x ,y )11 11
(x ,y )21 21
(x ,y )12 12
(x ,y )22 22
yF
Generación de fam ilias de círculosGrid of centers for the Fellenius or Bishop
Grid of centers defined by the user.
• 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.
![Page 29: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/29.jpg)
SYS C ivilFEMSlope Stability (Classic Methods/FEM)
• Very easy and intuitive way of defining the slope, circles, polygons, water pressures lines, seismic action and so on.
![Page 30: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/30.jpg)
SYS C ivilFEMSlope Stability
• With just one calculation, it’s possible to visualize the results according to the different available methods.
![Page 31: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/31.jpg)
SYS C ivilFEMSeepage 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
![Page 32: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/32.jpg)
SYS C ivilFEMSeepage Analysis
M N
0 3 .333 6 .667 10 13 .333 16 .667 20 23 .333 26 .667 30
0 3.333 6.667 10 13.333 16.667 20 23.333 26.667 30
![Page 33: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/33.jpg)
SYS C ivilFEMIntegration with FLAC3D
![Page 34: Geotechnical_CivilFEM](https://reader034.vdocuments.site/reader034/viewer/2022051609/5475398cb4af9f39698b45d8/html5/thumbnails/34.jpg)
SYS C ivilFEMSome 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.