RocFall3 | Your new tool for 3D assessment of slopes at risk for rockfalls. Get started with RocFall3 today!
 

Search Results

Design Standard

1. Introduction

In Slide3, design standards such as Eurocode 7 can be used to add partial factors to the different components of the analysis. Note that these partial factors are applied prior to the analysis to give design values that are used in the calculation.

Open the tutorial file in File > Recent > Tutorials > Design Standards and open the file Design Standard - starting file.

The starting file model is an unreinforced simple earth dam on an impermeable base.

Unreinforced Simple Earth Dam Model Start View

2. Model

The model is based on Example 5.12 in Smith (2006). It is a simple earth dam on an impermeable base for which the downstream side is to be analyzed. First, the problem will be analyzed in the traditional way and a factor of safety will be obtained. Then the Eurocode design analysis will be performed.

The dam is assumed to sit upon a high-strength material that is not included in the model.

    We will first check that the water table is assigned to the materials in the model.

    Water on Materials Cube Icon Select: Groundwater > Assign Water to Materials

    Make sure to select the Water Table from the drop-down menu and select Apply To All Materials.

    Hydraulic Assignments dialog with Apply To All Materials Highlighted

    Select OK.

    Slip Surfaces Icon Select:Surfaces > Slip Surface Options

    Slip Surface Options dialog

    Check that the following inputs are correct:

    • Surface Generation Method = Search Method
    • Surface Type = Ellipsoid
    • Search Method = Cuckoo Search
    • Surface Altering Optimization = ON

    Navigate to the Slip surface tab Slip Surface tab.

    You will see the model has a slope limit shown below. This limits the analysis to consider just the downstream slope:

    Image of model

    3. Compute

    Save the file.

    Calculator Icon Select: Analysis > Compute

    Open the compute dialog closes you can go to Results tab Results tab icon to see the results as shown below.

    Results Model View

    4. Eurocode 7 – Design Approach 1, Combination 1

    For this tutorial, we will demonstrate how to apply the Eurocode7 factors for Design Approach 1 only. As a disclaimer, this is by no means a comprehensive guide for determining which design standards to use for a specific problem.

    Design Approach 1 specifies two different combinations of partial factors. The first factors the action forces, and the second factors the resisting forces through the material properties. We will test both combinations in this tutorial. Now we will apply Eurocode 7 - Design Approach 1 – Combination 1 to the model first.

    Project Settings Icon Select:Analysis > Project Settings

    Navigate to the Design Standard Icon Design Standard tab and under the Design Standard dropdown, select: Eurocode 7 – Design Approach 1, Combination 1. Click the View Partial Factors button to check which factors are being applied.

    Eurocode 7 Design Approach 1, Combination 1 partial factors

    Here you can see that the factor for the Permanent actions (unfavourable) is 1.35. This essentially means that the driving force in the analysis will be multiplied by 1.35. The factors for the material properties are 1 so they will be unchanged in the analysis.

    Click OK twice to save and close the dialogs.

    Compute

    Calculator Icon Save the file as Combination 1, and Compute.

    To see the results, go to Results tab Results tab icon and you will see the result as shown below.

    Results Model View

    The Design Approach 1, Combination 1 has an over-design factor of 1.235. Now let’s compare this with the results for Combination 2.

    5. Eurocode 7 – Design Approach 1, Combination 2

    Select: Analysis > Project Settings Project Settings Icon.

    Navigate to the Design Standard Icon Design Standard tab and under the Design Standard dropdown, select: Eurocode 7 – Design Approach 1, Combination 2. You can check the factors applied by selecting ‘View Partial Factors’ button.

    Eurocode 7 Design Approach 1, Combination 2 partial factors

    Click OK twice to save and close the dialogs.

    Compute

    Calculator Icon Save the file as Combination 2, and Compute.

    To see the results, go to Results tab Results tab icon to see the results as shown below.

    Results Model View

    You can see the over-design factor with Design Approach 1, Combination 2 is less than 1.

    For more details on this example, there is the Slide2 Slope Design Tutorial with Eurocode 7 which shows the 2D model of the slope with more details on model. You will notice the Factor of Safety is slightly different from 2D to 3D model due to extrusion, but the applied partial factors from Design Standard to the model is similar for both of the programs.

    6. References

    Bond, A. J. and Harris, A. J., 2008. Decoding Eurocode 7, Taylor & Francis.

    British Standards Institution, 2004. Eurocode 7: Geotechnical design – Part 1: General rules, BS EN 1997-1, London, UK.

    Smith, 2006. Smith’s Elements of Soil Mechanics, 8th Edition, Blackwell Publishing.

    Account Icon - click here to log in or out of your account Shopping Cart icon Click here to search our site Click here to close Learning Tech Support Documentation Info Chevron Delete Back to Top View More" PDF File Calendar Location Language Fees Video Click here to visit Rocscience's LinkedIn page Click here to visit Rocscience's YouTube page Click here to visit Rocscience's Twitter page Click here to visit Rocscience's Facebook page Click here to visit Rocscience's Instagram page Bookmark Network Scroll down for more Checkmark Download Print Back to top Single User Multiple Users RSLog RocFall3 CPillar Dips EX3 RocFall RocPlane RocSupport RocTopple RS2 RS3 RSData RSPile Settle3 Slide2 Slide3 SWedge UnWedge Commercial License Education License Trial License Shop safe & secure Money-back guarantee