GGU-SLAB: "Layers" menu item

After clicking this menu item, the following dialog box appears. If you need to edit the number of layers, select the "Edit no. of layers" button and then enter the new number of layers.

In the dialog box you can enter the soil designation, constrained moduli and Poisson's ratios nu of the individual layers. Using the "Common soils" button, you can easily select the soil properties of many common soils from a database or determine intermediate values. In the dialog box, which you open by pressing the "Common soils" button, open the "Soils_english.gng_ggu" file when first starting the program in English ("Edit table"/"Load" buttons). Then save the data set in the "Soils.gng_ggu" file on the program level to open your modified database file when the program starts. You can also enter your own data ("Edit table"/"x soils to edit" button) and save it in the "Soils.gng_ggu" file. You can also use your adapted file in other GGU programs by means of the "Common soils" function if you copy the file into the appropriate GGU program folder.

Input of the unit weight of the wet soil is necessary for the limiting depth analysis, or the buoyant unit weight for soils below the groundwater table. This input box only appears if the "With limiting depth analysis" check box is activated in "File/New" or "System/Analyse".

If the constrained modulus is used for analysis, nu equals 0.0 for all soils. The value of nu displayed in the constrained mod. legend can then be switched off .

To ensure a sensible interpolation within the triangle mesh it is necessary that all nodes possess the same number of layers. If your system contains areas in which certain soil layers do not occur (e.g. peat lenses only in certain areas), then simply assign these layers a thickness of "0.0" at the appropriate nodes, using the "Default depths" menu item, i.e. a height corresponding to the layer above.

If you are working with vibrodisplacement compaction the following dialog box opens after clicking this menu item:

Define the soil layer improved by vibrodisplacement compaction by activating the "VDC" check box. Enter the corresponding parameters for this layer (see "Info" button). The ratio of the areas "A(C)/A" can be determined and adopted in the table by pressing the far-right button. The ratio "E(C)/E(B)" should not be greater than 15 to a maximum of 20.