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3DEC (3-Dimensional Distinct Element Code) is the three-dimensional extension of Itasca's two-dimensional code UDEC. It is specifically designed for the simulation of rock media containing multiple, intersecting joint structures and subjected either to quasi-static or to dynamic loading.
3DEC 4.1 includes a version (in addition to the 32-bit version) that is operable on a 64-bit processing computer; allowing the creation of unlimited model size. The new 3DEC interface features faster OpenGL-based model rendering for rapid rotation and translation of model views. In addition, the interface includes a built-in data file editor with syntax highlighting and one-click execution, easier access to tools for plotting, interactive tools for view manipulation and range definition, complete menu-driven access to all 3DEC file handling operations and new attributes for plot items including transparency. The user can now import 3-D surfaces from DXF files and use them as a pattern to construct a 3DEC model.
The new Nodal Mixed Discretization (NMD) technique provides more accurate solutions for plasticity analyses with models composed of linear tetrahedral zones, overcoming the over-stiff behaviour observed during plastic flow with this type of zone.
User-defined joint constitutive models can be created and compiled as dll. Revisions to the FISH language include a new debugging capability, the ability to pass arguments to FISH functions, the ability to create local variables in a function, and the ability to dynamically create and destroy FISH arrays. In addition, user-defined FISH intrinsics can be created as C++ dlls.
A new logic has been added which simplifies the task of defining locations for structural element liners. The new command SOLVE fos allows users to determine the factor of safety of a slope against general failure or collapse.
The user can also control damping parameters used for the interactions between blocks. In addition to the standard per machine license, the new network key facility allows a single hardware key to be installed on a central (server) computer for a network. 3DEC is run from any computer on the network — depending on the number of licenses available from the key. Network keys require a special licensing arrangement and installation.
Finally, a newly compiled HTML help has been included in 3DEC 4.1
The discontinuous medium is treated as an assembly of discrete rigid or deformable polyhedra. 3DEC allows multiple contact modes between blocks. The relative motion along discontinuities in both the normal and the shear directions is governed by linear and non-linear force-displacement relations. Deformable blocks contain elements whose behaviour is controlled by stress/strain laws.
3DEC contains a statistically-based Joint-Set Generator that allows users to rapidly create joints on the basis of orientation, length and spacing date ... The command "tunnel" is used to automatically create ideal forms.
Collapse of a rock mass and propagation of the blocks as far as the retaining structure. Top = Visualisation of displacement vectors. Bottom = Visualisation of rock blocks (initial state on the left hand side and final state on the right hand side).
Several block-and-joint material built-in constitutive models are provided in 3DEC.
Several block-and-joint material built-in constitutive models are provided in UDEC:
Possibility to develop one's own constitutive model in C++ (available as an option). This model can be used in most of the Itasca codes. Moreover, the user can access constitutive models developed by other users, via our web site http://www.itasca-udm.com/.
Certain gridpoint and zone variables can be initialised: stress state, pore pressures, saturation, velocity, temperature, mechanical pressure...
Certain gridpoint and zone variables can be fixed: stress state, pore pressures, saturation, velocity, temperature, mechanical pressure, absorbing boundaries ... Cross section of the Parthenon model that was analyzed against dynamic loading.
Cross section of the Parthenon model that was analysed against dynamic loading.
All Itasca codes possess the built-in programming language FISH that allows users to customise their analyses to suit their needs. Loading patterns, servo-control of test conditions and block generation sequences may be defined using FISH.
Itasca Consultants, an expert in numerical modelling, offers a new vision of numerical solutions thanks to its know-how and its software solutions. At the crossroads of consulting and Research & Development, Itasca Consultants provides computer modelling solutions for both the public sector and consulting firms.
Installation and general code operations are provided for free by phone, fax or email. Web site support (www.hcitasca.com) includes free code updates and a « Frequently Asked Questions » (FAQ) page.
Training courses, general or tailored to users' needs, are regularly organised by Itasca. Do not hesitate to contact us.
As provider of consulting services, Itasca provides tailored help to solve technical problems and write specific procedures.
