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21 - Rapid CPT Data Import

1.0 Introduction

In Settle3, Rapid CPT data import allows users to import multiple CPT data from data forensics. After entering Log-in information from the database, users can import multiple CPT from the cloud server and import multiple CPT data in Settle3. These CPT data can be used to analyze multiple CPT analysis, and plot soil profile as well as SBT (Soil Behavior Type) graph.

In this tutorial, we will show how this procedure is made by importing the data from data forensics. If you do not have access to the cloud server, you can still follow our tutorial with the files in the tutorial folder which contains .txt file.

Topics Covered in this Tutorial:

  • CPT analysis
  • Multiple CPT Data import
  • Multiple CPT data analysis

Finished file:

The finished file of this tutorial can be found in the Tutorial 21 Rapid CPT Data Import.s3z file. All tutorial files installed with Settle3 can be accessed by selecting File > Recent Folders > Tutorials Folder from the Settle3 main menu.

2.0 Model

2.1 Project Settings

  1. Select Home > Project Settings project settings icon (CTRL + J) to open the Project Settings dialog.
  2. In the General tab, make sure the Stress Units are set to Metric, stress as kPa and the Settlement Units are set to Meters.
  3. In the Cone Penetration Test (CPT) tab, make sure to check the box for CPT Analysis. We will use the Robertson 1986 CPT Classification with default values for atmospheric pressure (kPa), Net Area Ratio, and Cone Factor.
    Project Settings Dialog - CPT Tab
  4. Click OK.

3.0 Import Multiple CPT Data from Data Forensics

We will now import multiple CPT data from data forensics.

  1. Select CPT > Add CPT Add CPT.
  2. Add multiple CPT by selecting the Import Data Using Rapid CPT button at the bottom left.
    Importing Data fUsing Rapid CPT
  3. You will be prompted with log-in information for Data forensics. Enter your credentials below:
    Dataforensics Login Page
  4. If you do not have login information for Dataforensics Rapid CTP, we will simulate the process for this tutorial purposes.
  5. Please enter:

    • Username: tutorial
    • Password: tutorial
  6. After logging in with credentials, import the three *.ECP extension files : A01Y003C, A01Y004C, and A16Y068. These files are available in the same location where the tutorial folder is saved. The dialog should show the imported data as shown below:
    Edit CPT Data Dialog
  7. You will notice that the location coordinates are very large in values. We suggest you change these three coordinates closer to the origin (0,0) coordinates. For example, these coordinates are recreated by cutting off the first three digits of the large coordinates. Edit the coordinates for the CPT data as the following:
    C-5: (X = 1346.56, Y = 380.52)
    C-10: (X = 1288.06, Y = 530.42)
    C-6: (X = 1388.06, Y = 630.42)

    Otherwise, if you keep the values as they are, you will get a warning message for large coordinates for importing those coordinates due to issues in displaying the model on 2D and 3D views with large coordinates.
  8. Double-check that location X,Y are shown for all the data, and that graphs qc and fs are correctly imported. Keep the default values for GWT depth for correction as 2m and click OK.
  9. Press F2 to zoom out. You will see the three CPT data imported in the modeller.
    Model View of CPT Data

4.0 CPT Analysis Result

After multiple CPT data are imported, you can check the CPT analysis for each data by:

  1. Right-clicking on the data and selecting Graph CPT Graph cpt.

Graph CPT

When you graph CPT plot, you will see the result as shown below for the first data.

Plot of CPT Data

  1. Click the Toggle Multi-chart Toggle Multicharts option right beside the drop-down menu to select different CPT data.
  2. In the CPT Chart Controls check the boxes for the other two data sets.

cpt chart controls

Then you will be able to see the results for all three data imported in one plot.

CPT Data in One Plot

  1. You can also see the SBT (Soil Behavior Type) zone by selecting Plot SBT zone Plot SPT Zone

Then you will be able to see the SBT zone for the CPT data as shown below. You can toggle different methods to see how this changes within the dialog.

SBT Zones Dialog

5.0 Soil Profile

This feature also allows you to see the soil classification for delta size (m) of soil depth.

  1. Go back to the modeller, right-click and select CPT Soil Classification Soil classification icon as shown below.
    Soil Profile From CPT
    Then you will be able to see the soil classification with % for depth of soil defined as shown below for imported CPT data C-6:
    CPT Soil Profile Dialog
  2. Select the Soil Layers tab to see the soil profile with layer depth as overall layout of the soil layer column.
    CPT Soil Profile Dialog
  3. Click OK to close the dialog.
This is the soil profile for the CPT data. This is not incorporated in the borehole soil layer.

6.0 Additional Exercise

The CPT Simulation feature can be used when you have more than two CPT points in the model. First, we will simulate points between the three CPTs we have imported in this tutorial.

6.1 CPT Simulation

  1. Select CPT > Simulate at Point Simulate at point icon

The Simulate at Point dialog will open, where Parameters and Points settings can be defined.

Simulate at point dialog

Parameters allow you to simulate the parameter of choice, and points allow you to define the density of your simulation for CPT points, and depth at which the points will be generated.

Hovering over the Info icon will allow you to see more details on the different options for Points. Keep in mind, your selection will affect computation time (Coarse = faster, Fine = slower).

Simulate at point paramaters

  1. For the Density at Depth value, select Medium.
  2. Select anywhere between CPT points C-5 and C-6. After the simulation is completed, the symbol will indicate the simulated CPT is ready, by changing from grey to blue.
    Points C-5 to C-6
  3. Right click on Simulated CPT point and select Edit CPT.
  4. In the Edit CPT dialog, you will see the simulated CPT data points. Data cannot be modified here, however, you can select and copy the cells to other programs.
  5. Edit CPT Dialog

    Note that the values here are an average of all the simulations. To see all simulated results, select Export Simulations.
  6. If you place the CPT simulations near the CPT input and change Density with Depth to Fine, note that the simulated CPT is similar to the input CPT.
simulated cpt near cpt inputCPT graphs

As shown in the graphs above, the simulated point is similar to the C-10 CPT points.

6.2 CPT Settlement

You can use the Add Settlement from Region option to simulate Schmertmann’s empirical settlement with simulated CPT points.

  1. Select CPT > Add Settlement from Region add settlement from region icon
  2. You will see the Add Settlement Region dialog, which allows you to define the foundation size, number of grid points, and density of the simulated parameters. Refer to the CPT Theory Manual for details on CPT settlement.
    Add Settlement Region dialog
    The Unit weight option allows you to assign constant unit weight along the depth of soil. Alternatively, you can allow the unit weight to be simulated at the cost of computation time.
  3. Click OK. You will then be prompted to define each of the grid points within the region, using the dimensions provided in the Add Settlement Region dialog.
  4. Enter the coordinates using your mouse or enter "t" in prompt line to use the coordinate table option.
  5. xy

    Define region

  6. Click Compute CPT Simulations compute settlement region. Depending on the your settings, you may be prompted with a warning message regarding a longer computation time.

Once the results are computed, the results window will open. Here, you can see the contour of the settlement. All the grid points are shown with the settlement results.

CPT simulation settlement contour results

This concludes the additional exercise of the simulated CPT and CPT settlement feature.

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