udec官方讲座(english)
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1. Graphical user interface 2. Factor-of-safety calculation based on the shear strength reduction method 3. User-defined zone and joint constitutive models 4. Mixed discretization to provide more accuracy for plasticity analysis
UDEC also simulates the behavior of the intact material between the planes of weakness as a nonlinear continuum, using the generalized finite-difference method (arbitrary element shapes), known as the finite volume method.
Discontinuous medium modeled as an assemblage or concave blocks; blocks may be rigid or deformable. Discontinuities treated as boundary conditions between blocks.
A discrete element code will embody an efficient algorithm for detecting and classifying contacts. It will maintain a data structure and memory allocation scheme that can handle many hundreds or thousands of discontinuities or contacts. The name “Distinct Element Method” is used for a DEM that uses an explicit dynamic solution to Newton’s laws of motion.
5. Two-phase flow in joints
6. Network key license version
New Feature in UDEC 4.01
Released in October 2008 Improved and re-structured graphical user interface (available at no additional charge to current Version 4.0 owners)
DEM Definitions
The name “Discrete Element Method” (DEM) should be applied to a method only if it*:
1. allows finite displacements and rotations of discrete bodies; including complete detachment 2. recognizes new interactions (contact) automatically as the calculation progresses
Planned New Features in UDEC 5.0
Estimated release: mid 2009
1. Generic “virtual-model” generation tool to facilitate model creation 2. Speedup of double-precision version by converting to Intel Fortran compiler 3. Mixed Discretization scheme for triangular elements “Nodal Mixed Discretization” to provide more accurate solution of plasticity problems using triangular grids 4. Rockbolt elements to simulate rock reinforcement including tensile rupture, strain-softening behavior of grout and effect of changing confining stress 5. Help File containing Command Reference, FISH Reference and Example Applications
Training Schedule
October 28, 2008 (afternoon)
02:00-03:15 Overview of UDEC/3DEC Features and Capabilities
- Overview of capabilities in geo-engineering
UDEC solves the full dynamic equations of motion even for quasห้องสมุดไป่ตู้static problems. This has advantages for problems that involve physical instability, such as collapse, as will be explained later. To model the “static” response of a system, damping is used to absorb kinetic energy.
UDEC
1. 2. 3. 4. 5. 6. 7. 8. 9.
… is best suited to modeling discontinuous materials (containing many intersecting discontinuities) that exhibit nonlinear behavior. In particular, it features:
of convex
Motion along discontinuities governed by linear and non-linear force-displacement relations for movements in both the normal and shear direction. Many built-in block and joint constitutive models that are representative of geologic, or similar, materials; optional user-written models. Plane-strain, plane-stress and axisymmetric geometry modes. Structural element models for rock-structure interaction – cables, piles, beams, liners, shotcrete, soil reinforcement, etc. Static and dynamic analysis capabilities. Transient and steady state fluid flow in joints. Viscoelastic and viscoplastic (creep) models.
What is UDEC?
UDEC is a DEM code that allows the simulation of the interaction of blocks. This may be a jointed rock mass, a masonry wall, or any material where the mode of displacement may occur along preexisting planes of weakness or discontinuity. Any geometry can be represented, and the boundary conditions are quite general.
New Features in 3DEC 4.1
Released in January 2008
1. 2. Accelerated interactive graphics (OpenGL based plotting) with new graphical structure New Mixed Discretization scheme for tetrahedral elements “Nodal Mixed Discretization” provides more accurate solution of plasticity problems using tetrahedral grids 64-bit version Factor of Safety calculation mode Improvements to user-defined constitutive models and addition of user-defined joint constitutive models Improvements to structural element logic including installation at tunnel intersections
10. Thermal analysis capability, with coupling to solid and fluid
collapse of a masonry arch bridge
3DEC
-similar to UDEC, but in three dimensions
-contains the same features as listed for UDEC
UDEC/3DEC Short Course
Itasca Software Training Course
Tongji University Shanghai, China October 27-31, 2008 Peter Cundall, Yanhui Han & Roger Hart Itasca Consulting Group, Inc.
full and sectioned views of a tower modeled for stability using the dynamic opt ion
Model of arch dam using finite-element blocks
New Features in UDEC 4.0
- New features in UDEC and 3DEC - Theoretical basis 03:15-03:30 03:30-05:00 Break Running Models in UDEC - Menu-driven versus command-driven operation - Simple tutorial
3. 4. 5.
6.
7.
8. 9.
Help File containing Command Reference, FISH Reference and Example Applications
New PGEN interface Improved FISH language
The Explicit Dynamic Solution Scheme and the Distinct Element Method in UDEC & 3DEC
UDEC also simulates the behavior of the intact material between the planes of weakness as a nonlinear continuum, using the generalized finite-difference method (arbitrary element shapes), known as the finite volume method.
Discontinuous medium modeled as an assemblage or concave blocks; blocks may be rigid or deformable. Discontinuities treated as boundary conditions between blocks.
A discrete element code will embody an efficient algorithm for detecting and classifying contacts. It will maintain a data structure and memory allocation scheme that can handle many hundreds or thousands of discontinuities or contacts. The name “Distinct Element Method” is used for a DEM that uses an explicit dynamic solution to Newton’s laws of motion.
5. Two-phase flow in joints
6. Network key license version
New Feature in UDEC 4.01
Released in October 2008 Improved and re-structured graphical user interface (available at no additional charge to current Version 4.0 owners)
DEM Definitions
The name “Discrete Element Method” (DEM) should be applied to a method only if it*:
1. allows finite displacements and rotations of discrete bodies; including complete detachment 2. recognizes new interactions (contact) automatically as the calculation progresses
Planned New Features in UDEC 5.0
Estimated release: mid 2009
1. Generic “virtual-model” generation tool to facilitate model creation 2. Speedup of double-precision version by converting to Intel Fortran compiler 3. Mixed Discretization scheme for triangular elements “Nodal Mixed Discretization” to provide more accurate solution of plasticity problems using triangular grids 4. Rockbolt elements to simulate rock reinforcement including tensile rupture, strain-softening behavior of grout and effect of changing confining stress 5. Help File containing Command Reference, FISH Reference and Example Applications
Training Schedule
October 28, 2008 (afternoon)
02:00-03:15 Overview of UDEC/3DEC Features and Capabilities
- Overview of capabilities in geo-engineering
UDEC solves the full dynamic equations of motion even for quasห้องสมุดไป่ตู้static problems. This has advantages for problems that involve physical instability, such as collapse, as will be explained later. To model the “static” response of a system, damping is used to absorb kinetic energy.
UDEC
1. 2. 3. 4. 5. 6. 7. 8. 9.
… is best suited to modeling discontinuous materials (containing many intersecting discontinuities) that exhibit nonlinear behavior. In particular, it features:
of convex
Motion along discontinuities governed by linear and non-linear force-displacement relations for movements in both the normal and shear direction. Many built-in block and joint constitutive models that are representative of geologic, or similar, materials; optional user-written models. Plane-strain, plane-stress and axisymmetric geometry modes. Structural element models for rock-structure interaction – cables, piles, beams, liners, shotcrete, soil reinforcement, etc. Static and dynamic analysis capabilities. Transient and steady state fluid flow in joints. Viscoelastic and viscoplastic (creep) models.
What is UDEC?
UDEC is a DEM code that allows the simulation of the interaction of blocks. This may be a jointed rock mass, a masonry wall, or any material where the mode of displacement may occur along preexisting planes of weakness or discontinuity. Any geometry can be represented, and the boundary conditions are quite general.
New Features in 3DEC 4.1
Released in January 2008
1. 2. Accelerated interactive graphics (OpenGL based plotting) with new graphical structure New Mixed Discretization scheme for tetrahedral elements “Nodal Mixed Discretization” provides more accurate solution of plasticity problems using tetrahedral grids 64-bit version Factor of Safety calculation mode Improvements to user-defined constitutive models and addition of user-defined joint constitutive models Improvements to structural element logic including installation at tunnel intersections
10. Thermal analysis capability, with coupling to solid and fluid
collapse of a masonry arch bridge
3DEC
-similar to UDEC, but in three dimensions
-contains the same features as listed for UDEC
UDEC/3DEC Short Course
Itasca Software Training Course
Tongji University Shanghai, China October 27-31, 2008 Peter Cundall, Yanhui Han & Roger Hart Itasca Consulting Group, Inc.
full and sectioned views of a tower modeled for stability using the dynamic opt ion
Model of arch dam using finite-element blocks
New Features in UDEC 4.0
- New features in UDEC and 3DEC - Theoretical basis 03:15-03:30 03:30-05:00 Break Running Models in UDEC - Menu-driven versus command-driven operation - Simple tutorial
3. 4. 5.
6.
7.
8. 9.
Help File containing Command Reference, FISH Reference and Example Applications
New PGEN interface Improved FISH language
The Explicit Dynamic Solution Scheme and the Distinct Element Method in UDEC & 3DEC