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Driven Analysis of Tapered Piles (Raymond and Monotube)

1.0 Introduction

In this tutorial, you will learn how to analyze a single driven pile in multiple soil layers under various conditions in RSPile. Before proceeding with the tutorial, make sure you’ve gone through Tutorial 01 - RSPile Quick Start to familiarize yourself with the product’s basic functions and features.

Finished Product:

The finished product of this tutorial can be found in the Tutorial 11 - Driven Pile Analysis of Tapered Piles data file. All tutorial files installed with RSPile can be accessed by selecting File > Recent Folders > Tutorials Folder from the RSPile main menu.

2.0 Model

When the RSPile program is started, a new blank document is already opened, allowing you to begin creating a model immediately.

On sign convention: In RSPile, the default ground surface is at depth = 0, depth is positive downwards, and compressive stress is positive.

2.1 PROJECT SETTINGS

  1. Select Analysis > Project Settings (CTRL + J) or click on the Project Settings Project Settings icon icon in the toolbar.
  2. In the General tab, set the Units to Imperial and Program Mode Selection to Capacity Calculations.
  3. Go to Capacity Calculations and set the Individual Pile Capacity to Driven.
  4. Project Settings - Pile Analysis Type tab

  5. Go to the Advanced tab.
  6. Click on Defaults... and select the "Restore original program defaults" option.
    Set Program Defaults dialog
  7. Click OK.
  8. Set Pile Discretization to Auto using the dropdown menu.
  9. Project Settings - Advanced tab

    The number of Pile Segments should default to 200.
  10. Click OK to close the Project Settings dialog.

3.0 Soil

3.1 DEFINE SOIL PROPERTIES

  1. Select Soils > Soil Properties or click on the Define Soil Properties Define soil properties icon in the toolbar.
  2. Define the following parameters:
    • Soil Property 1
      • Unit Weight (lbs/ft3) = 118
      • Soil Type = Cohesionless
      • Driving Strength Loss (%) = 20
      • Internal Friction Angle (Skin Friction) = 32
      • Internal Friction Angle (End Bearing) = 32

    Soil Properties dialog

    • Soil Property 2
      • Unit Weight (lbs/ft3) = 125
      • Soil Type = Cohesive
      • Driving Strength Loss (%) = 20
      • Undrained Shear Strength (psf) = 5000
      • Adhesion Type: Piles Driven Through Overlying Sands or Sandy Gravels (Tomlinson 1980)

      Soil Properties dialog

  3. Click OK to close the dialog.

4.0 Boreholes

4.1 EDIT BOREHOLE

  1. Select Soils > Borehole Editor or click on the Edit Borehole borehole editor icon icon in the toolbar.
  2. Click the Insert Layer Below Insert Layer Below icon button to add another soil layer.
  3. For Borehole 1, set the Thickness (ft) of each layer to the following values:
    • Soil Property 1 = 10 ft.
    • Soil Property 2 = 30 ft.
  4. Edit Borehole dialog
  5. Click OK to close the dialog.

5.0 Piles

5.1 DEFINE PILE SECTION PROPERTIES

  1. Select Piles > Pile Section Properties or click on the Define Pile Section Properties Pile Section Properties icon icon in the toolbar.
  2. For Pile Section 1, define the following parameters:
    • Cross Section = Raymond
    • Diameter of Pile (ft) = 1.5

    Define Pile Section Properties dialog

  3. Click OK to close the dialog.

Notes:

  • Any cross-section can be made tapered in the Pile type Editor Except for H-Pile
  • Monotubes can be modelled (similar to v3.005) by selecting Pipe Pile – Closed End
  • With reference to Chart 2.1.1.3, of the theory manual:
    • The uniform section of the Pile-Pipe closed end will use curve a
    • The tapered section of the Pile-Pipe closed end will use curve g
    • The uniform section of a Raymond pile will use curve d
    • The tapered section of a Raymond pile will use curve e

5.2 EDIT PILE TYPE

  1. Select Piles > Edit Pile Types or click on the Define Pile Types Define Pile Types icon icon in the toolbar.
  2. Click the Insert Layer Below Insert Layer Below icon icon to add another section.
  3. For Section #2, select Pile Section 1 from the dropdown as the section property. In addition, set Cross Section Type = Tapered and Taper Angle = 0.46 degrees.
  4. Set the following lengths for each section:
    • #1 - Pile Section 1 = 5 ft.
    • #2 - Pile Section 1 = 35 ft.

    Edit Pile Types dialog

  5. Click OK to close the dialog.

5.3 OPTIONAL CAPACITY CONSIDERATIONS

  1. Select Analysis > Optional Capacity Considerations. In the Optional Capacity Considerations dialog, you can define additional parameters that will affect the Ultimate Capacity Analysis.
  2. Enter the following properties:
    • Design Type = Soft Compressible Soil
    • Depth of Soft Compressible Soil (ft) = 2
  3. Optional Capacity Considerations dialog

  4. Click OK to close the dialog.

5.4 ADDING A PILE

The Add Single Pile dialog is where the pile elevation (depth of the top of the pile) and length are defined. To add a pile:

  1. Select Piles > Add Pile or click on the Add Single Pile Sngle Pile with Plus icon icon in the toolbar.
  2. Add Pile dialog

  3. Since we've already defined the pile properties, click OK to close the Add Pile dialog. You will be prompted to enter the (x,y) coordinates of the new single pile. You may enter the location manually in the bottom right of the screen, or click a point on the Plan View to place it.
  4. Enter Location = (0, 0) and press Enter.
  5. Pile model

6.0 Results

6.1 COMPUTE

  1. Select Analysis > Compute or click on the Compute Compute icon icon in the toolbar.
  2. Compute dialog

Notice that the soil column has now been updated to reflect the strata.

Results model

6.2 RESULTS VISUALIZATION

After computation, the Restrike (Total) is shown along the length of the pile by default. Use the Data Type dropdown to control what results are shown.

Data Type dropdown

Pile Results may be toggled on or off using the View Controls in the sidebar.

View Controls pane

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