Soil Layer [SIG]
The Soil Layer definition is used to specify the characteristics of the soil. Various models are available in OpenBrIM.
Regarding soil models, note that when a soil model is selected, only the necessary parameters for that model are displayed to the engineer.
General:
Soil Type[Cohesionless/Cohesive/Rock]: Specify the soil type. Avaliable Soil Models are filtered according to the Soil Type.
Unit Weight: Specify the unit weight of the soil.
Top of Layer Elevation: This parameter specifies the global elevation of top layer of the soil.
Bottom of Layer Elevation: This parameter specifies the global elevation of bottom layer of the soil.
Lateral:
Model (Cohesionless): Specify the lateral soil model for cohesionless soils. Available options: Sand (Reese), Sand (API), Liquefied Sand (Rollins), or Custom P-Y.
Model (Cohesive): Specify the lateral soil model for cohesive soils. Available options: Soft Clay (Matlock), Stiff Clay without Free Water (Welch and Reese), Stiff Clay with Free Water (Reese), or Custom P-Y.
Model (Rock): Specify the lateral soil model for rock. Available options: Weak Rock (Reese), Strong Rock (Turner), Limestone (McVay), or Custom P-Y.
Custom P-Y: When Custom P-Y model is selected, define the custom P-Y curve data points. The first point must be [0,0], all values must be positive, and at least three points are required.
Undrained Shear Strength: The undrained shear strength of the soil, used for clay models (Matlock Soft Clay, Stiff Clay with/without Free Water).
Average Undrained Shear Strength: The average undrained shear strength over the depth, used for Stiff Clay models.
Major Principal Strain at 50%: The strain at 50% of the maximum principal stress difference, used for clay models.
Internal Friction Angle: The internal friction angle of the soil, used for sand models (Reese Sand, API Sand).
Subgrade Modulus: The modulus of subgrade reaction, used for Sand (Reese), Sand (API), and Stiff Clay with Free Water models.
Mass Modulus: The initial mass modulus of the rock, used for Weak Rock (Reese) model.
Stiffness Constant (k_rm): A dimensionless constant relating rock mass modulus to intact rock modulus, used for Weak Rock (Reese) model.
Unconfined Compressive Strength: The unconfined compressive strength of the rock, used for Weak Rock, Strong Rock, and Limestone models.
Rock Quality Designation (RQD) %: The Rock Quality Designation as a percentage, used for Weak Rock (Reese) model.
For theoretical details about the models, refer to Lateral Soil Models.
Axial:
Model (Cohesionless): Specify the axial soil model for cohesionless soils. Available options: Driven Pile (McVay), Drilled Shaft Sand (Reese and O'Neill), or Custom T-Z.
Model (Cohesive): Specify the axial soil model for cohesive soils. Available options: Driven Pile (McVay), Drilled Shaft Clay (Reese and O'Neill), or Custom T-Z.
Model (Rock): Specify the axial soil model for rock. Available options: Driven Pile (McVay) or Custom T-Z.
Custom T-Z: When Custom T-Z model is selected, define the custom T-Z curve data points. The first point must be [0,0], all values must be positive, and at least three points are required.
Poisson's Ratio of Soil: The Poisson's ratio of the soil, used for Driven Pile (McVay) model.
Shear Modulus: The shear modulus of the soil, used for Driven Pile (McVay) model.
The ultimate shear stress (Skin friction): The ultimate unit skin friction resistance along the pile shaft, used for Driven Pile (McVay) model.
Undrained Shear Strength: The undrained shear strength of the clay, used for Drilled Shaft Clay (Reese and O'Neill) model.
For theoretical details about the models, refer to Axial TZ Soil Models.
Tip:
Model: Specify the appropriate model according to the definition of the soil material.
These are the currently avaliable tip soil models in the OpenBrIM:
Driven Pile (McVay)
Drilled Shaft Sand (Reese and O'Neill)
Drilled Shaft Clay (Reese and O'Neill)
Custom Q-Z
Custom Q-Z: When Custom Q-Z model is selected, define the custom Q-Z curve data points. The first point must be [0,0], all values must be positive, and at least three points are required.
Poisson's Ratio of Soil: The Poisson's ratio of the soil, used for Driven Pile (McVay) tip model.
Shear Modulus: The shear modulus of the soil, used for Driven Pile (McVay) tip model.
Ultimate Tip Resistance: The ultimate unit tip resistance at the pile base, used for Driven Pile (McVay) model.
Uncorrected SPT N: The uncorrected Standard Penetration Test (SPT) blow count, used for Drilled Shaft Sand (Reese and O'Neill) tip model.
Undrained Shear Strength: The undrained shear strength of the clay at the pile tip, used for Drilled Shaft Clay (Reese and O'Neill) tip model.
For theoretical details about the models, Axial QZ Soil Models.
Torsional:
Model: Specify the appropriate model according to the definition of the soil material.
These are the currently avaliable torsional soil models in the OpenBrIM:
Hyperbolic Curve
Custom T-θ
Custom T-θ: When Custom T-θ model is selected, define the custom torque-rotation curve data points. The first point must be [0,0], all values must be positive, and at least three points are required.
Shear Modulus: The shear modulus of the soil, used for Hyperbolic Curve torsional model.
Torsional Shear Stress: The ultimate torsional shear stress at the soil-pile interface, used for Hyperbolic Curve torsional model.
For theoretical details about the models, Torsional Soil Models.
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