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Tutorial - additional plates

Introduction

Soilin is a tool which calculates C parameters of the subsoil under the surface support. Using the additional plates around the support provides more realistic results.

About C parameters:

1) C parameters are parameters of interaction, so their value depends on the structure, load, stiffness and subsoil. Change in any of those parts causes different C parameters.

2) The whole plate is supported vertically by the soil stiffness – parameter C₁ (winkler) and also in the shear direction – parameter C₂ (pasternak).

3) The plate edges are more supported by the C₂ parameters because it is affected by neglecting.

4) The area around the support is affected by the shear stiffness of the soil and the degrease basin is created.

5) The degrease basin can be substituted by spring supports around the plate – this is done automatically in SCIA Engineer when user don’t add plates around.

6) When user uses the plates around the support, the springs are not added and the C parameters are calculated for the whole area.

-> This tutorial describes how to create plates around the support - additional plates.

Settings for soilin calculation

1. The functionality Subsoil and Soil iteration must be checked.

2. One combination must be linear - this combination is used for soilin calculation.

3. This linear combination must be selected in Solver setup to run soilin with it.

4. The project must contain borehole with geologic profile.

5. The project must contain surface support type soilin.

How to calculate the plate without soilin

1. Open the project “soilin_start.esa”.

2. There is one plate with the surface support type Individual. This type of the support has a constant parameters C₁ and C₂.

3. Run the linear calculation with the default settings.

4. Go to the service Results. Display the results for internal forces. There are no results for C parameters.
5. Internal forces - for example vy:

How to calculate the plate with soilin.

1. Change the support type to soilin.
2. Run the linear calculation again.
3. Go to the service Results. Display the results for internal forces and soilin for combination C01.

4. Internal forces - vy:

5. Subsoil - C parameters - parameter C1z:

6. Subsoil - Other data (see the preview with the table for the settlement):

7. Subsoil - Other data - use the action button "Soil Stress Diagram" and select one green vertex:

8. A new dialogue appears - there is a stress diagram for the selected mesh element:

9. Close the dialogue.
10. Use ESC to finish the action.

The edges of the plate are supported by springs automatically.

How to create the additional plates around

1. Use the same project.
2. Open the Structure service and start the command for inserting a new plate.
3. Set the thickness of the plate to 1mm.
4. Create 4 plates around the surface support according to the picture. The width from the original plate is 3m.

5. Add the surface support type soilin on those plates.

6. Run the linear calculation with the same settings again.
7. Go to the service Results. Display the results for soilin.
8. Subsoil - C parameters - parameter C1z:

9. Subsoil - Other data (see the preview with the table for settlement):

10. Subsoil - Other data - use the action button "Soil Stress Diagram" and select one green vertex:

11. Stress diagram for selected mesh element:

12. Close the dialogue.
13. Use ESC to finish the action.
14. The interesting results are deformations.
15. See the result "Displacement of nodes", value Uz on Deformed structure:

The deformed structure shows the degrease basin.

16. The result is in project "soilin_finished.esa".

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