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Driven Pile Analysis

1.0 Introduction

This tutorial demonstrates 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 so you’re familiar with the product’s basic functions and features.

Topics Covered in this Tutorial:

  • Multi-layer model
  • Soil types for driven piles
  • Pile properties
  • Export data to Excel

Finished Product:

The finished product of this tutorial can be found in the Tutorial 4 Quick Start – Driven Pile Analysis.rspile2 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.

Note 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

The Project Settings is where you can change the analysis type, tolerance, number of iterations allowed, and the number of pile segments to be used in the analysis. To open the 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 Metric and Program Mode Selection to Capacity Calculations.
  3. In the Capacity Calculations tab, set Individual Pile Capacity to Driven.
  4. Project Settings - Analysis type - Driven

  5. Select the Groundwater tab.
  6. Check the Groundwater Analysis box.
  7. Define the following elevations:
    • Elevation at Time of Drilling (m) = -2
    • Elevation for Restrike/Driving (m) = -2
    • Elevation for Ultimate (m) = 0

    Project Settings - Ground Water

  8. Click OK to close the dialog.
The default units for RSPile are metric. To change this setting, select the General tab and change the Units.

2.2 SOIL PROPERTIES

  1. Select Soils > Define Soil Properties (CTRL + 8) or click on the Define Soil Properties define soil properties icon icon in the toolbar.
  2. In this dialog you can define the properties related to the Q-z, t-z, and p-y curves. There is a tab for the analysis type you selected in the Project Settings as well as for datum dependency. The Datum Dependency tab allows users to control linearly varying properties.

  3. Define the material properties as shown in the table below:
  4. Name

    Unit Weight (kN/m3)

    Soil Type

    Undrained Shear Strength (kPa)

    Adhesion Type

    Skin Friction Angle (degrees)

    End Bearing Angle (degrees)

    Driving Strength Loss (%)

    Yellow square

    Cohesive

    18

    Cohesive

    100

    General Adhesion for Cohesive Soils (Tomlinson 1979)

    -

    -

    17

    Pink square

    Cohesionless 1

    18.5

    Cohesionless

    -

    -

    32

    32

    8

    Green square

    Cohesionless 2

    18.5

    Cohesionless

    -

    -

    36

    36

    8

    Orange square

    Cohesionless 3

    19

    Cohesionless

    -

    -

    38

    38

    20

    There are two ways to define the friction angle in RSPile: manually input the Skin Friction Angle, or check the Use SPT N Values option and enter a table of SPT values from which the friction angle will be calculate

    soil properties dialog

  5. Click OK to close the dialog.

2.3 SOIL LAYERS

RSPile supports multiple boreholes and non-horizontal soil strata. When multiple boreholes are defined, the program will automatically interpolate between the boreholes. In this tutorial, we will model horizontal soil strata with a single borehole. To begin:

  1. Select Soils > Borehole Editor or click on the Edit All Boreholes borehole editor icon in the toolbar.
  2. The default soil column has a single layer and is located at (0, 0). To change the location, enter coordinates for X and Y. We will keep it (0,0) here.

  3. Click on Insert Layer Below insert layer below icon to add another layer below the first. For this tutorial, we will do this four times. The name column will fill in by soil property sequence. Layers are defined by thickness by default but may be defined by top and bottom elevation. This may be changed by toggling Define Layers by Thickness.
  4. Specify the following layer thicknesses:
  5. #

    Name

    Thickness

    Top Elevation

    Bottom Elevation

    1

    Cohesive

    10

    0

    -10

    2

    Cohesionless 1

    7

    -10

    -17

    3

    Cohesionless 2

    7

    -17

    -24

    4

    Cohesionless 3

    7

    -24

    -31

    The Soil Layer Column on the right side of the dialog will update automatically as layer thicknesses are defined.

    Edit borehole dialog
  6. Click OK to save your input and exit the dialog.

Borehole model

2.4 OPTIONAL CAPACITY CONSIDERATIONS

  1. Select Analysis > Optional Capacity Considerations.
  2. In the Optional Capacity Considerations dialog you can define additional parameters that will affect the Ultimate Capacity Analysis.

  3. Enter the following properties:
    • Design Type = Soft Compressible Soil
    • Depth of Soft Compressible Soil (m) = 1.5

    Optional Drive Design dialog

  4. Click OK to close the dialog.

2.5 PILE PROPERTIES

  1. Select Piles > Pile Section Properties or click on the Define Pile Section Properties define pile section properties icon in the toolbar.
  2. Select Pile Property 1 and enter the properties displayed below:
    • Pile Cross Section = Pile Pipe - Open End
    • Diameter of Pile (m) = 0.508
    • Shell Thickness (m) = 0.00635

    Define Pile Properties dialog

  3. Click OK to close the dialog.

2.6 ADDING A PILE

To add a pile:

  1. Select Piles > Add Pile or click on the Add Single Pile add single pile icon icon in the toolbar.
  2. Edit Pile dialog

  3. Click on the Edit Edit Pile button icon for the Pile Type and enter the following properties for Pile Type 1:
    • Name = Pile Type 1
    • Pile Head Elevation (m) = 0
    • Length (m) = 31

    Edit Pile types dialog

  4. Click OK to close the Edit Pile Type dialog. Click OK again to close Add Pile dialog.
  5. 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.

  6. Enter Location = (0, 0) and press Enter.
  7. Select Compute compute.

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

Final Model

3.0 Results

3.1 RESULTS VISUALIZATION

After clicking the Compute button, the Restrike Capacity is shown along the length of the pile by default. Use the Data Type dropdown to control what results are shown.

Results Dropdown

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

View Controls

3.2 GRAPHS

  1. In the Plan View, right-click on the pile and select Graph Pile graph pile

You will see the following results:

  • Restrike (Total) vs Depth
  • Driving (Total) vs Depth
  • Ultimate (Total) vs Depth

graph results


The sidebar contains the Chart Controls, which allow you to select what information is displayed and customize the appearance. The charts that are displayed, as well as the displayed tables, can be changed by right-clicking in the chart area and selecting what data you would like to edit in the dropdown menu.

You can use the tabs on the bottom of the Results window to switch between the following sets of results:

  • Driven (Total) Results
  • Driven (Skin Friction) Results
  • Driven (End Bearing) Results
  • Combined Driven Results
  • Custom (+)

3.3 EXPORT TO EXCEL

From the Results tab, you can export your data to Excel. To do so

  1. Click on the Export Data to Excel Export to excel icon icon in the toolbar.

Each data type is exported to its own Sheet in the Excel file.

4.0 Report Generator

The Report Generator presents a formatted summary of input data and analysis results.

  1. Go back to the model view and click on the Report Generator Report generator icon icon in the toolbar.

The Report Generator contains a summary of the model input data:

  • Project Summary
  • Soil Layers
  • Soil Properties
  • Pile Section Properties
  • Pile Types
  • Pile Settings

The toolbar contains the Report Generator Controls, which allow you to select what information is displayed, and customize the appearance.

The data can be exported in a variety of ways: it may be manually copied, viewed in a browser, printed, or the information may be saved as a .pdf file. Prior to printing the file, results may be formatted to your specifications.

  1. Click on the Close Close icon icon in the Report Generator toolbar to close the viewer and return to the model view.

This concludes the Driven Pile Analysis Tutorial. You may now exit the RSPile program.

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