Fault_insertion
Contents
Data Structure: Fault_insertion |
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Defines the data associated with seeding or inserting faults |
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Fault_insertion NUM=ival where ival is the data structure number |
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Overview Fault insertion may be used to either seed or insert faults into a continuum model. With fault seeding the continuum elements containing the fault are given an initial plastic strain, either volumetric or shear depending on the model type, to reduce their strength in the initial or depositional configuration. In fault insertion, the fault is inserted as discrete lines (2D) or surfaces (3D, not yet available) with a contact property defining the interaction between both the fault sides.
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 | Insertion_type Type of fault insertion |
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Defines the type of fault insertion. Valid values are: • "Seeded" - Seed a fault by weakening the elements underlying the fault path (2D and 3D) • "Split" - Insert or extend a fault by inserting new geometry lines in the existing surfaces (2D only) • "Mixed" - Mixture of seeding and splitting defined on an individual fault level
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| Units List of unit names (Compulsory) |
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List of fault insertion unit names to be used for fault insertion (Default all groups).
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| Group_numbers List of element groups (Optional) |
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List of element groups (by number) to be used for fault insertion (Default all groups).
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| Groups List of element group names |
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List of element groups (by name) to be used for fault insertion (Default all groups).
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| Fault_numbers List of Fault_set numbers (Optional) |
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List of Fault_set numbers to be used in fault insertion (Default all faults).
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| Faults List of Fault_set names |
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List of Fault_set names to be used in fault insertion (Default all faults).
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| Seeding_variables List of seeding variables |
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Defines the list of allowable seeding variables. These variables are dependent on the constitutive model type of the groups in which faults will be seeded. Seeding_variables allows the definition of a list of the variables that are going to be used. The valid variables are: • "P_strnv" - Plastic volume strain for the SR3, SR4 and Cam Clay models. Then an initial value of volumetric plastic strain may be defined via Seeding_values • "P_strn" - Plastic strain for the Drucker-Prager model. Then an initial value of effective plastic strain may be defined via Seeding_values
The initial strength will then be reduced and defined by the hardening curve. |
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| Seeding_values Seeding values for fault |
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Defines the value of each seeding variable listed in Seeding_variables.
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| Deposition_flag Flag denoting that newly deposited layers will be seeded |
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Flag denoting whether new deposited units after initialization will be seeded. Valid values are: • 0 - Do not seed newly deposited layers • 1 - Seed newly deposited layers
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| Tip_length_fact Factor denoting the percentage of the top formation specified that will be penetrated by the fau |
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Factor denoting the percentage of the top formation specified that will be penetrated by the fault (Default: not used).
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| Tip_length_factors Factor denoting the percentage of the top formation specified that will be penetrated by each fa |
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Factor denoting the percentage of the top formation specified that will be penetrated by each fault. One value is required for each fault.
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| Element_size Element size for seeding elements |
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Defines the element size for seeding elements.
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| Mesh_type Flag denoting mesh type for seeded group |
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Flag denoting whether unstructured mesh or structured mesh will be seeded. Valid values are: • 0 - Unstructured mesh (default) • 1 - Structured mesh
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