10 - Telescopic Pile Analysis

1.0 Introduction

In this tutorial the same pile of Tutorial 9: Telescopic Drilled Pier with Bell is analyzed for a lateral load of 1000 kN and a vertical load of 4000 kN using the program RSPile.

Topics covered:

• Axially/Laterally Loaded
• Defining Pile Sections
• Pile Types

Finished Product:

The finished product of this tutorial can be found in the Tutorial 10 - Telescopic pile analysis under lateral and axial load.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

Open the Tutorial 9 - Telescopic Drilled Pier with Bell.rspile2 data file by selecting File > Recent Folders > Tutorials Folder from the RSPile main menu.

2.1 PROJECT SETTINGS

1. Select Home > Project Settings (CTRL + J).
2. In the General tab, change the Program Mode Selection to Pile Analysis.
3. Go to the Pile Analysis Type tab and select to Individual Pile Analysis > Axially / Laterally Loaded.
   
4. Go to the the Advanced tab to choose your accuracy tolerance and other solution controls:
• Pile Discretization = Custom
• Pile Segments = 50
• Convergence Tolerance = 0.0001
• Number of Iterations = 100
• Reinforced Concrete Slices = 100
• Use Method of Georgiadis Layering Effect = Yes
5. Click OK to close the dialog.

3.0 Soil

3.1 DEFINE SOIL PROPERTIES

The soil layers are the same as Tutorial 9 but the soil models required for Lateral Analysis and Axial Analysis are chosen with the suitable parameters as follows:

1. Select Soils > Define Soil Properties to open the Soil Properties dialog.
2. Edit the soil properties as follows:

For Clay:

• In the Lateral tab select the Soil Type as the Submerged stiff clay model and keep the same undrained shear strength. Change Ks (kN/m3) to 200000.
  

• In the Axial tab select the Soil Type as the Drilled Clay model, while copying the calculated unit skin resistance and end bearing resistance from the previous tutorial results: 70 and 900 kPa respectively.

For Dense Sand:

• In the Lateral tab select the soil type as the Sand model. Enter the Friction angle as 38, Kpy (kN/m3) as 61000 and Kpy Saturated (kN/m3) as 34000.
  

• In the Axial tab select the soil type as the Drilled Sand model, while copying the calculated unit skin resistance and end bearing resistance from the previous tutorial results: 32 and 9600 kPa respectively.

3.2 Edit Boreholes

We will leave the same borehole location and layer thicknesses as in Tutorial 9. To view the borehole details:

1. Select Soils > Edit All to open the Edit Borehole dialog.

4.0 Piles

4.1 DEFINE PILE SECTION PROPERTIES

The pile is defined similarly as it is in Tutorial 9: Telescopic Drilled Pier with Bell. A minor update must be made to the Pile Section Properties.

1. Select Piles > Pile Sections



2. The section type is chosen as Elastic.
3. Change the Young’s modulus to 35000000 kPa for the three segments (Pile Sections 1-3).
4. Enter the following Diameter (m) for each pile section (the same diameters entered in Tutorial 9):
• Pile Section 1 = 1.4 m
• Pile Section 2 = 1.2 m
• Pile Section 3 = 1 m
5. Click OK to close the dialog.

4.2 EDIT PILE TYPE

The pile editor will show the same built-up pile definition as in Tutorial 9. To view the Pile Type Editor select Piles > Edit Pile Type.

4.3 ADD PILE

1. Select Piles > Single to open the Add Pile dialog.
2. In the Geometry tab Pile Type 1 should be selected by default.
   
3. Enter a Location (x,y) of (0,0).

4.3.1 Loading

Next we will apply and define the loading:

1. Go to Loading tab and click on the Add button to add a Loading Property.
   
2. Enter the follow properties:
• Loading Property = Loading Property 1
• Static
• Load Factor Profile = None
• Loading Direction = General
3. Click the Add button at the bottom of the dialog twice to add the following two Load Types:
• Shear X (kN): Value = 1000 ; Depth (m) = 0
• Force Z (kN): Value = -4000; Depth (m) = 0
4. Click OK to close the dialog.

5.0 Results

5.1 COMPUTE

1. Select File > Save As to save the file with a new name.
2. Then compute the file by selecting Results > Compute

5.2 RESULTS

The results of the pile analysis will be similar to what you have learned in previous tutorial for individual pile analysis.