Fault_set
Contents
Data Structure: Fault_set |
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Fault set data structure |
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Fault_set NUM=ival where ival is the data structure number |
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Overview Fault_set data structure defines a fault set with topology defined by either a single or two Geometry_set or via a Part_geometry_set if the fault is not initially discretised. Fault sets are required for operations of fault seeding or fault insertion.
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 | Name Name of the fault set |
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Name of the fault set (Maximum of 32 characters).
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| Fracture_assignment Name of the Fracture_data |
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Name of the Fracture_data (Maximum of 32 characters).
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| Description Description of the fault set |
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Description of the fault set (Maximum 128 characters).
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| Update_data_flag Flag for updating the data for an existing fault |
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Flag for updating the data for an existing fault. For example, to indicate that the top surface should be included or not in the contact definition for a particular analysis stage. The valid values are: • 0 - Data definition is new or overwrites an existing fault definition • 1 - Data definition updates an existing fault
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| Fault_type The type of fault in terms of vertical offset |
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The type of fault in terms of vertical offset; i.e. whether the fault is a normal fault or an inverse fault. This is only required when the output from a restoration will be used as input for a forward model generation. In this case, when there is no pre-existing sediment, the type of the fault will be used to establish whether the geometry associated with faults intersecting the basal horizon is associated with the footwall or the hanging wall. Valid types are: • "Normal" - Normal fault in extension • "Inverse" - Inverse fault in compression
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| Geometry_set Geometry set name |
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Assigns the geometry set (or part geometry set) defining the fault. Geometry_set is used for cases where a single geometry (or part geometry) set is sufficient to define the fault. For cases where the footwall and hangingwall surfaces need to be defined separately Footwall_set and Hangingwall_set will be used instead.
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| Footwall_set Footwall set name |
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Assigns the geometry set (or part geometry set) defining the fault Footwall. Definition of Hangingwall_set is also required. For cases where a single geometry (or part geometry) set is sufficient to define the fault Geometry_set might be used instead.
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| Hangingwall_set Hanging wall set name |
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Assigns the geometry set (or part geometry set) defining the fault Hangingwall. Definition of Footwall_set is also required. For cases where a single geometry (or part geometry) set is sufficient to define the fault Geometry_set might be used instead.
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| Property_name Contact property set name |
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Assigns the contact property set (by name) to be applied to the fault. This is only required if the fault set is assigned a different contact property set to the default value.
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| Footwall_tip_node Node defining the tip of the footwall surface (2D only) |
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Node defining the tip of the footwall surface (2D only). If not specified then the tip is assumed to correspond to the end node of the footwall that has the highest elevation (Y-coordinate).
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| Hangingwall_tip_node Node defining the tip of the hanging wall surface (2D only) |
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Node defining the tip of the hanging wall surface (2D only). If not specified then the tip is assumed to correspond to the end node of the hanging wall that has the highest elevation (Y-coordinate).
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| Footwall_tip_point Point defining the tip of the footwall surface (2D only) |
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Point defining the tip of the footwall surface (2D only). If not specified then the tip is assumed to correspond to the end point of the footwall that has the highest elevation (Y-coordinate).
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| Hangingwall_tip_point Point defining the tip of the hanging wall surface (2D only) |
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Point defining the tip of the hanging wall surface (2D only). If not specified then the tip is assumed to correspond to the end point of the hanging wall that has the highest elevation (Y-coordinate).
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| Insertion_type Type of fault to be inserted |
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Faults may be either pre-defined via geometry lines (2D) or surfaces (3D) that are grouped into the hangingwall and footwall geometry sets, or generated during the simulation via Fault_insertion. If Fault insertion is specified then individual faults can be assigned a specific fault insertion type. Valid values are: • "None" - Fault is not inserted into model • "Default" - Fault insertion will be governed by the settings specified in Fault_insertion • "Seeded" - Seeded fault, generate one geometry set per line • "Split" - Split geometry faults, group lines on same fault under same geometry set (2D only)
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| Mesh_size Mesh size for generation of new stratigraphy |
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Defines the target element size near the fault when generating the mesh for the deposited sediment in which a fault is inserted. If the target mesh size is not specified, default values based on the mesh size of the existing sediment will be used.
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| Contact_sets List of contact sets associated with the fault |
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List of contact sets associated with the fault when it is created. If no Contact_sets are specified then a new contact set will be generated during the creation of the fault by fault insertion. This data only applies to faults that are not created or extended by fault insertion.
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| Extension_tolerance Extension tolerance for creating line tips (2D only) |
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Extension tolerance for creating line tips (2D only, Default 0.5 (50%) of the adjacent facet length). If the tolerance is greater than zero the start and the end of the line will be extended if the tolerance would lead to intersection with a surface boundary rather than forming a line tip internal to a surface.
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| Root_tolerance Tolerance for intersection of root of new inserted faults (2D only) |
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Tolerance for intersection of root of new inserted faults (2D only, Default 0.2 (20%) of the adjacent facet length). May need to be increased if the fault is rooted on an older fault to ensure that the intersection is evaluated with sufficient tolerance.
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| Stablisation_load_fact Stabilisation surface stress factor to be applied to exposed fault surfaces |
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Defines a multiplication factor for the surface load (defined via Applied_stress in Stratigraphy_surface_load) to be applied to an exposed fault (Default 1.0). Note that for a surface load to be applied to exposed fault surfaces Fault_load_flag 1 should be specified in Stratigraphy_surface_load and/or in Stratigraphy_basal_load.
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| Face_load_update_frequency Frequency for update of face loading information |
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Frequency for update of face loading information (Default 200 steps).
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| Face_load_ramp_frequency Number of steps for ramping up face load on a newly exposed fault node |
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Number of steps defined to ramp up the face load on a newly exposed fault node (Default 200 steps).
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| Footwall_surf_cont_flag Footwall-to-surface contact extension flag |
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Flag to automatically add the model top surface to the fault footwall in 2-D for contact processing to allow the hangingwall of compressional faults to override the model surface if the fault offset is sufficiently large. Valid values are: • 0 - Do not add model surface to fault contact definition • 1 - Add model surface to fault contact definition
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| Dip_direction Dip direction in 2-D |
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By default the dip direction is set using the line topology defining a fault. Shallow dip faults in a sloping sediment where part of a detachment is included in the fault definition can result in ambiguous conditions, as both the left and right side of the fault definition is elevated. In this case manual definition of the dip direction is required. Valid values are: • "Left" - Left dipping fault • "Right" - Right dipping fault
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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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| Factor_for_seeding_width Scale factor for fault seeding band width |
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Defines the scaling factor to control the fault seeding band width (Default is 1.0). This is the width over which elements will be identified as fault elements after seeding.
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